Volume 12,Issue 6,2019 Table of Contents

1 Effects of the long wavelength-filtered continuous spectrum on natural refractive development in juvenile guinea pigs

Rui-Qin Li , Wei-Zhong Lan , Xiao-Ning Li , Hao-Ran Wu , Qing-Lin Xu , Hong Zhong , Wen-Tao Li , Zhi-Kuan Yang

2019, 12(6):883-891. DOI: 10.18240/ijo.2019.06.01

[Abstract](1469) [HTML](237) [PDF 1.05 M](646)

Abstract:
AIM: To investigate the effects of spectral composition and light intensity on natural refractive development in guinea pigs. METHODS: A total of 124 pigmented guinea pigs (2-week-old) were randomly assigned to three groups at high (Hi; 4000 lx), medium (Me; 400 lx) and low (Lo; 50 lx) light intensities under a 12:12 light/dark cycle for 6wk. Each group was subdivided into subgroups with the following spectra: broad spectrum Solux halogen light (BS), 600 nm above-filtered continuous spectrum (600F), 530 nm above-filtered continuous spectrum (530F), and 480 nm above-filtered continuous spectrum (480F; HiBS: n=10, Hi600F: n=10, Hi530F: n=10, Hi480F: n=10, MeBS: n=10, Me600F: n=10, Me530F: n=10, Me480F: n=10, LoBS: n=11, Lo600F: n=12, Lo530F: n=10, Lo480F: n=11). Refractive error, corneal curvature radius, and axial dimensions were determined by cycloplegic retinoscopy, photokeratometry, and A-scan ultrasonography before and after 2, 4, and 6wk of treatment. Average changes from both eyes in the ocular parameters and refractive error were compared among different subgroups. RESULTS: After 6wk of exposure, high-intensity lighting enhanced hyperopic shift; medium- and low-intensity lighting enhanced myopic shift (P<0.05). Under the same spectrum, axial increase was larger in the low light intensity group than in the medium and high light intensity groups (HiBS: 0.65±0.02 mm, MeBS: 0.67±0.01 mm, LoBS: 0.82±0.02 mm; Hi600F: 0.64±0.02 mm, Me600F: 0.67±0.01 mm, Lo600F: 0.81±0.01 mm; Hi530F: 0.64±0.02 mm, Me530F: 0.67±0.01 mm, Lo530F: 0.73±0.02 mm; Hi480F: 0.64±0.01 mm, Me480F: 0.66±0.01 mm, Lo480F: 0.72±0.02 mm; P<0.05). Under 400 lx, there was a faster axial increase in the MeBS group than in the Me480F group (P<0.05). Under 50 lx, axial length changes were significantly larger in LoBS and Lo600F than in Lo530F and Lo480F (P<0.01). CONCLUSION: Under high-intensity lighting, high light intensity rather than spectrum distributions that inhibits axial increase. Under medium- and low-intensity lighting, filtering out the long wavelength inhibits axial growth in juvenile guinea pigs.

2 Semaphorin 7a participants in pterygium by regulating vascular endothelial growth factor

Yun-Fei Han , Zhen Liu , Bang Wang , Wei Zhu , Jing-Zhen Li , Yue-Qin Qi , Xiao-Jing Li , Yan-Yun Xu , Xiao-Xiao Dou , Guo-Ying Mu

2019, 12(6):892-897. DOI: 10.18240/ijo.2019.06.02

[Abstract](1361) [HTML](228) [PDF 1.01 M](663)

Abstract:
AIM: To investigate the relationship between semaphorin 7a expression and cell proliferation and migration in pterygium fibroblasts. METHODS: Twenty-six patients with surgically diagnosed pterygium were enrolled, including 15 cases of primary pterygium and 11 cases of recurrent pterygium. In addition, 12 cases of normal conjunctival tissue were collected. The expression of semaphorin 7a in normal conjunctival tissue, primary pterygium and recurrent pterygium was detected by real-time polymerase chain reaction. Recurrent pterygium fibroblasts were isolated and cultured, and the expression of semaphorin 7a was silenced by small interfering RNA (siRNA) interference technique. Furthermore, the effects of si-semaphorin 7a interference on the mRNA and protein levels of β1-integrin, vascular endothelial growth factor A (VEGFA) and vascular endothelial growth factor receptor (VEGFR), and on fibroblast proliferation were analyzed. Transwell assay was used to detect the effect of semaphorin 7a interference on fibroblast migration. RESULTS: Semaphorin 7a was highly expressed in the primary pterygium and recurrent pterygium samples than that of the normal conjunctival tissue. Compared with the primary pterygium, the expression of semaphoring 7a in the recurrent pterygium samples was significantly increased (P<0.05). The mRNA and protein expression levels of β1-integrin, VEGFA and VEGFR were decreased after si-semaphorin 7a transfection, and as well as the cell proliferation and migration. CONCLUSION: Semaphorin 7a might play important roles in the pathogenesis of pterygium by affecting the expression of β1-integrin, VEGFA and VEGFR.

3 Inhibition of LOX-1 alleviates the proinflammatory effects of high-mobility group box 1 in Aspergillus fumigatus keratitis

Jia-Qian Jiang , Cui Li , Cong-Xian Cui , Yu-Na Ma , Gui-Qiu Zhao , Xu-Dong Peng , Qiang Xu , Qian Wang , Guo-Qiang Zhu , Chen-Yu Li

2019, 12(6):898-903. DOI: 10.18240/ijo.2019.06.03

[Abstract](1702) [HTML](235) [PDF 1.67 M](627)

Abstract:
AIM: To investigate the inflammatory amplification effect of high-mobility group box 1 (HMGB1) in Aspergillus fumigatus (A. fumigatus) keratitis and the relationship between lectin-like oxidized low-density lipoprotein receptor 1 (LOX-1) and HMGB1 in keratitis immune responses. METHODS: Phosphate buffer saline (PBS), and Boxb were injected into BALB/c mice subconjunctivally before the corneas were infected with A. fumigatus. RAW264.7 macrophages and neutrophils were pretreated with PBS and Boxb to determine the HMGB1 inflammatory amplification effects. Abdominal cavity extracted macrophages were pretreated with Boxb and Poly (I) (a LOX-1 inhibitor) before A. fumigatus hyphae stimulation to prove the the relationship between the two molecules. LOX-1, interleukin-1β (IL-1β), tumor necrosis factor-α (TNF-α), macrophage inflammatory protein-2 (MIP-2) and IL-10 were assessed by polymerase chain reaction and Western blot. RESULTS: Pretreatment with Boxb exacerbated corneal inflammation. In macrophages and neutrophils, A. fumigatus induced LOX-1, IL-1β, TNF-α and MIP-2 expression in Boxb group was higher than those in PBS group. Poly (I) treatments before infection alleviated the proinflammatory effects of Boxb in abdominal cavity extracted macrophages. Pretreatment with Boxb did not influence Dectin-1 mRNA levels in macrophages and neutrophils. CONCLUSION: In fungal keratitis, HMGB1 is a proinflammatory factor in the first line of immune response. HMGB1 mainly stimulates neutrophils and macrophages to produce inflammatory cytokines and chemokines during the immune response. LOX-1 participates in HMGB1 induced inflammatory exacerbation in A. fumigatus keratitis.

4 Acute lens opacity induced by different kinds of anesthetic drugs in mice

Xiao-Tong Li , Yu Qin , Jiang-Yue Zhao , Jin-Song Zhang

2019, 12(6):904-908. DOI: 10.18240/ijo.2019.06.04

[Abstract](1199) [HTML](237) [PDF 1.63 M](625)

Abstract:
AIM: To study whether specific anesthetic drugs or tear layer evaporation was primarily responsible for the acute cataract and what the change of lens structure is in anesthetized mice. METHODS: Five groups were set up in the experiment: Group A (topicamide and phenylephrine mixed eye drop+ chloral hydrate), Group B (tropicamide and phenylephrine mixed eye drop+sevoflurane), Group C (tropicamide and phenylephrine mixed eye drop), Group D (topicamide and phenylephrine mixed eye drop+chloral hydrate, carbomer eye drop in the right eyes), and Group E (tropicamide and phenylephrine mixed eye drop+sevoflurane, carbomer eye drop in the right eyes). A simple classification system was used to assess the severity of lens opacity. And a numerical value from 0 to 3 to each grade was assigned for the cataract index calculation and data analysis. The gross appearance and time course of development of lens opacity were assessed. Hematoxylin and eosin staining was used to observe the lens structure changes in the reversible cataract. RESULTS: Tropicamide did not induce lens opacification in mice. Lens opacity caused by inhaled sevoflurane was similar to injected cholral hydrate. Both inhaled-anesthetic-induced lens opacity and injected-anesthetic-induced lens opacity could be prevented by carbomer eye drop. In the severe opacity lens, a wide range of lens fiber cell structure had disordered. The fiber cells became uneven thickness. CONCLUSION: The acute reversible lens opacity can unilaterally develop or be induced by a local cause. The structure of lens fiber cells changed in the lens opacity which may influence the permanent connection of the lens fiber cells. This study was not only of practical significance to help maintain lens transparency for eye research, but also of the deeper consideration about the reversible lens opacification phenomenon.

5 Compound heterozygous mutations in CYP1B1 gene leads to severe primary congenital glaucoma phenotype

Na Song , Lin Leng , Xue-Jiao Yang , Yu-Qing Zhang , Chun Tang , Wen-Shi Chen , Wei Zhu , Xian Yang

2019, 12(6):909-914. DOI: 10.18240/ijo.2019.06.05

[Abstract](1411) [HTML](225) [PDF 1.08 M](631)

Abstract:
AIM: To identify the novel mutation alleles in the CYP1B1 gene of primary congenital glaucoma (PCG) patients at Shandong Province of China, and investigate their correlation with glaucomatous features. METHODS: The DNA from the peripheral blood of 13 congenital glaucoma patients and 50 ethnically matched healthy controls from the affiliated hospital of Qingdao University were extracted. The coding region of the CYP1B1 gene was amplified by PCR and direct DNA sequencing was performed. Disease causing-variants were analyzed by comparing the sequences and the structures of wild type and mutant CYP1B1 proteins by PyMOL software. RESULTS: Two missense mutations, including A330F caused by c.988G>T&c.989C>T, and R390H caused by c.1169G>A, were identified in one of the 13 PCG patients analyzed in our study. A330F mutation was observed to be novel in the Chinese Han population, which dramatically altered the protein structure of CYP1B1 gene, including the changes in the ligand-binding pocket. Furthermore, R390H mutation caused the changes in heme-protein binding site of this gene. In addition, the clinical phenotype displayed by PCG patient with these mutations was more pronounced than other PCG patients without these mutations. Multiple surgeries and combined drug treatment were not effective in reducing the elevated intraocular pressure in this patient. CONCLUSION: A novel A330F mutation is identified in the CYP1B1 gene of Chinese PCG patient. Moreover, in combination with other mutation R390H, this PCG patient shows significant difference in the CYP1B1 protein structure, which may specifically contribute to severe glaucomatous phenotype.

6 Whole-exome sequencing identifies novel mutations in genes responsible for retinitis pigmentosa in 2 nonconsanguineous Chinese families

Yan-Shan Hu , Hui Song , Yin Li , Zi-Yun Xiao , Tuo Li

2019, 12(6):915-923. DOI: 10.18240/ijo.2019.06.06

[Abstract](1346) [HTML](229) [PDF 2.82 M](617)

Abstract:
AIM: To detect the pathogenetic mutations responsible for nonsyndromic autosomal recessive retinitis pigmentosa (RP) in 2 nonconsanguineous Chinese families. METHODS: The clinical data, including detailed medical history, best corrected visual acuity (BCVA), slit-lamp biomicroscope examination, fundus photography, optical coherence tomography, static perimetry, and full field electroretinogram, were collected from the members of 2 nonconsanguineous Chinese families preliminarily diagnosed with RP. Genomic DNA was extracted from the probands and other available family members; whole-exome sequencing was conducted with the DNA samples provided by the probands, and all mutations detected by whole-exome sequencing were verified using Sanger sequencing in the probands and the other available family members. The verified novel mutations were further sequenced in 192 ethnicity matched healthy controls. RESULTS: The patients from the 2 families exhibited the typical symptoms of RP, including night blindness and progressive constriction of the visual field, and the fundus examinations showed attenuated retinal arterioles, peripheral bone spicule pigment deposits, and waxy optic discs. Whole-exome sequencing revealed a novel nonsense mutation in FAM161A (c.943A>T, p.Lys315*) and compound heterozygous mutations in RP1L1 (c.56C>A, p.Pro19His; c.5470C>T, p.Gln1824*). The nonsense c.5470C>T, p.Gln1824* mutation was novel. All mutations were verified by Sanger sequencing. The mutation p.Lys315* in FAM161A co-segregated with the phenotype, and all the nonsense mutations were absent from the ethnicity matched healthy controls and all available databases. CONCLUSION: We identify 2 novel mutations in genes responsible for autosomal recessive RP, and the mutation in FAM161A is reported for the first time in a Chinese population. Our result not only enriches the knowledge of the mutation frequency and spectrum in the genes responsible for nonsyndromic RP but also provides a new target for future gene therapy.

7 Elevated expression of TREK-TRAAK K2P channels in the retina of adult rd1 mice

Xiao-Tong Zhang , Zhen Xu , Kang-Pei Shi , Dian-Lei Guo , Han Li , Lei Wang , Xiao-Bo Zhu

2019, 12(6):924-929. DOI: 10.18240/ijo.2019.06.07

[Abstract](1819) [HTML](262) [PDF 1.32 M](647)

Abstract:
AIM: To examine the expression of Twik-related K+ channel 1 (TREK-1), Twik-related K+ channel 2 (TREK-2), and Twik-related arachidonic acid-stimulated K+ channel (TRAAK) in the retina of adult rd1 mice and to detect the protective roles of TREK-TRAAK two-pore-domain K+ (K2P) channels against retinal degeneration. METHODS: Twenty-eight-day-old C57BL/6J mice and 28-day-old rd1 mice were used in this study. Retinal protein, retinal RNA, and embedded eyeballs were prepared from these two groups of mice. Real-time quantitative polymerase chain reaction and Western blot analyses were used to assess the gene transcription and protein levels, respectively. Retinal structures were observed using hematoxylin and eosin (H&E) staining. Immunohistochemistry was utilized to observe the retinal localization of TREK-TRAAK channels. Current changes in retinal ganglion cells (RGCs) after activation of TREK-TRAAK channels were examined using a patch-clamp technique. RESULTS: Compared with C57BL/6J mice, rd1 mice exhibited significantly higher retinal mRNA and protein expression levels of TREK-1, TREK-2, and TRAAK channels. In both groups, immunohistochemistry showed expression of TREK-TRAAK channels in retinal layers. After addition of the TREK-TRAAK channel agonist arachidonic acid (AA), whole-cell voltage step evoked currents were significantly higher in RGCs from rd1 mice than in RGCs from control C57BL/6J mice, suggesting that TREK-TRAAK channels were opened in RGCs from rd1 mice. CONCLUSION: TREK-TRAAK K2P channels’ expression is increased in adult rd1 mice. AA induced the opening of TREK-TRAAK K2P channels in adult rd1 mice and may thus counterbalance depolarization of RGCs and protect the retina from excitotoxicity. TREK-TRAAK channels may play a protective role against retinal degeneration.

8 Effects of astaxanthin on antioxidant parameters in ARPE-19 cells on oxidative stress model

Yi&gbreve;it Musa , Güne&scedil; Alime , U&gbreve;uz Cihangir , Yalç&inodot;n Tök Özlem , Tök Levent , Öz Ahmi , Naz&inodot;ro&gbreve;lu

2019, 12(6):930-935. DOI: 10.18240/ijo.2019.06.08

[Abstract](1539) [HTML](228) [PDF 681.13 K](622)

Abstract:
AIM: To observe the protective effect of astaxanthin (AST) against hydroquinone (HQ) mediated cell death in the apoptotic cascade and evaluate intracellular Ca2+ release, caspase-3, and -9 activation, reactive oxygen species (ROS) production in ARPE-19 cells. METHODS: We cultured ARPE-19 cells in special mediums and performed MTT tests to determine protective effect of AST, before exposing the cells to HQ in an incubator. We analyzed intracellular Ca2+ release experiments, mitochondrial membrane depolarization, glutathione (GSH), glutathione peroxidase (GSH-Px) and ROS experiments, and apoptosis assay. RESULTS: ROS production ranges depend on the amount of cell death. We computed the correlation between ROS ranges and cell death by 20,70-dichlorofluorescein fluorescence, and Ca2+ levels by Fura-2-AM. HQ-induced cell death found out to rise ranges of caspase-3 and -9, and mitochondrial depolarization. These three steps were delayed by AST management. CONCLUSION: ARPE-19 cells are avoided from HQ-induced ROS production and caspase-3 and -9 activation by AST. AST may limit the range of caspase synthesis, Ca2+ release and excess production of ROS with antiapoptotic effect. This study proposes a new therapeutic approach for the treatment of age-related macular degeneration.

9 Chronic photodamage in the chicken retina using 650-nm semiconductor laser

Yi-Peng Wang , Ze-Yu Liang , Song Chen , Wen-Chao Yang , Jia-Hui Kong

2019, 12(6):936-942. DOI: 10.18240/ijo.2019.06.09

[Abstract](1462) [HTML](230) [PDF 3.42 M](575)

Abstract:
AIM: To investigate the occurrence of chronic photodamage in the cone-based retina, following long-term exposure to a 650-nm semiconductor laser (power: 2 mW). METHODS: Chickens fed for 1mo under natural light after hatching were irradiated with 650-nm laser light at different times each day. Fifteen animals were included in each group. Group A was a control group, irradiated with natural light during the entire study. Group B was irradiated with laser for 3 min/d. Group C was irradiated with laser for 6 min/d. Group D was irradiated with laser for 30 min/d. The duration of the light experiment was 6mo. We obtained data at 1, 3, and 6mo, including measuring the retinal thickness in vivo using optical coherence tomography, hematoxylin and eosin staining, TUNEL assay, apoptosis staining, malondialdehyde (MDA) content, superoxide dismutase (SOD) activity, and Western blotting to detect changes in L/M opsins and rhodopsin. RESULTS: At 1mo, the MDA content in Group D was higher than that observed in Group A (P=0.019). At 3mo the MDA content in Groups C and D was higher than that reported in Group A (P=0.026, 0.003). At 6mo, the MDA content in Groups B, C, and D was higher than that observed in Group A (P=0.038, 0.032, 0.000, respectively). There was no difference in SOD activity, and L/M opsin and rhodopsin content between the groups at 1 and 3mo. The SOD activity in group D was significantly decreased at 6mo (P=0.000), as was the content of rhodopsin. There was no significant reduction observed in retinal thickness, abnormal cell arrangement, and positive staining of TUNEL in the groups during the 6-month study period. CONCLUSION: Irradiation using a 650 nm semiconductor laser (power: 2 mW) for 6min per day over 6mo do not cause photodamage. Similarly, a 3-month exposure of 30min per day do not cause damage. However, irradiation for 6mo resulted in a significant increase in the content of free radicals and a decrease in the content of rhodopsin in the retina, suggesting the presence of photodamage.

10 Effect of lens constants optimization on the accuracy of intraocular lens power calculation formulas for highly myopic eyes

Jia-Qing Zhang , Xu-Yuan Zou , Dan-Ying Zheng , Wei-Rong Chen , Ao Sun , Li-Xia Luo

2019, 12(6):943-948. DOI: 10.18240/ijo.2019.06.10

[Abstract](1998) [HTML](237) [PDF 482.69 K](595)

Abstract:
AIM: To evaluate the effect of different lens constant optimization methods on the accuracy of intraocular lens (IOL) power calculation formulas for highly myopic eyes. METHODS: This study comprised 108 eyes of 94 consecutive patients with axial length (AL) over 26 mm undergoing phacoemulsification and implantation of a Rayner (Hove, UK) 920H IOL. Formulas were evaluated using the following lens constants: manufacturer’s lens constant, User Group for Laser Interference Biometry (ULIB) constant, and optimized constant for long eyes. Results were compared with Barrett Universal II formula, original Wang-Koch AL adjustment method, and modified Wang-Koch AL adjustment method. The outcomes assessed were mean absolute error (MAE) and percentage of eyes with IOL prediction errors within ±0.25, ±0.50, and ±1.0 diopter (D). The nonparametric method, Friedman test, was used to compare MAE performance among constants. RESULTS: Optimized constants could significantly reduce the MAE of SRK/T, Hoffer Q, and Holladay 1 formulas compared with manufacturer’s lens constant, whereas the percentage of eyes with IOL prediction errors within ±0.25, ±0.50, and ±1.0 D had no statistically significant differences. Optimized lens constant for long eyes alone showed non-significant refractive advantages over the ULIB constant. Barrett Universal II formula and formulas with AL adjustment showed significantly higher accuracy in highly myopic eyes (P<0.001). CONCLUSION: Lens constant optimization for the subset of long eyes reduces the refractive error only to a limited extent for highly myopic eyes.

11 Impact of ultrasound and optical biometry on refractive outcomes of cataract surgery after penetrating keratoplasty in keratoconus

Katarzyna Krysik , Anita Lyssek-Boron , Dominika Janiszewska-Bil , Edward Wylegala , Dariusz Dobrowolski

2019, 12(6):949-953. DOI: 10.18240/ijo.2019.06.11

[Abstract](1283) [HTML](221) [PDF 467.97 K](602)

Abstract:
AIM: To analyse the impact of ultrasound and optical intraocular lens (IOL) calculation methods on refractive outcomes of cataract phacoemulsification performed after penetrating keratoplasty (PK) in keratoconus. METHODS: Phacoemulsification cataract surgery was performed on 42 eyes of 34 patients with keratoconus who had previously undergone PK. The IOL power was determined by using both standard and corneal topography-derived keratometry using the SRK/T formula. We used two independent methods-ultrasound biometry (UB) and interferometry [optical biometry (OB)] for IOL calculation. The analysed data from medical records included demographics, medical history, best corrected visual acuity (BCVA) on Snellen charts, technique of IOL calculation and calculation formula and its impact on final refractive result. RESULTS: BCVA ranged from 0.01 to 0.4 (mean 0.09±0.19) before surgery and ranged from 0.2 to 0.7 (mean 0.38±0.14) at 1mo and from 0.2 to 1.0 (mean 0.56±0.16) (P<0.05) at 3mo, postoperatively. The refractive aim differed significantly from the refractive outcome in both the UB and OB groups (P<0.05). There was no statistically significant difference in the accuracy of the two biometry methods. CONCLUSION: The refractive aim in keratoconus eyes post-PK is not achieved with either ultrasound or OB.

12 Late in-the-bag spontaneous IOL dislocation: risk factors and surgical outcomes

Sevgi Subasi , Nursen Yuksel , V. Levent Karabas , Busra Yilmaz Tugan

2019, 12(6):954-960. DOI: 10.18240/ijo.2019.06.12

[Abstract](1531) [HTML](226) [PDF 327.84 K](608)

Abstract:
AIM: To evaluate the possible predisposing risk factors for late in-the-bag spontaneous IOL dislocations and to study the early surgical and visual outcomes of repositioning and exchange surgeries. METHODS: Medical and surgical records of 39 eyes of 39 patients who underwent IOL repositioning or exchange surgery for dislocation between 2010 and 2018 were reviewed. Possible predisposing risk factors and some characteristics of late in-the-bag spontaneous IOL dislocations; outcomes of IOL repositioning and exchange surgeries, including visual acuity, refractive status before and after surgery and postoperative complications were evaluated. RESULTS: The predisposing factors for late in-the-bag spontaneous IOL dislocations were pseudoexfoliation [PEX; 12/39 (30.8%)], previous vitreoretinal surgery [7/39 (17.9%)], axial myopia [3/39 (7.7%)], both PEX and axial myopia [1/39 (2.6%)], both previous vitreoretinal surgery and axial myopia [2/39 (5.1%)] and uveitis [1/39 (2.6%)]. The mean interval between cataract and dislocation surgery was 7.23y, greater in PEX positive group (8.63y). The mean best corrected visual acuity (BCVA) improved significantly after dislocation surgery (P<0.001) and also improved significantly after exchange surgery (P=0.001). The mean value of spherical equivalant decreased significantly after dislocation surgery (P=0.011), whereas corneal astigmatism increased but this difference was not significant after dislocation surgery and exchange surgery (P=0.191, P=0.074, respectively). CONCLUSION: The most prevelant risk factors for late in-the-bag spontaneous IOL dislocations are PEX, previous vitreoretinal surgery and axial myopia. In the management of IOL dislocations, exchange surgery with small corneal incision seemed effective with improved BCVA and safety with low postoperative complications.

13 Effect of femtosecond laser-assisted lens surgery on the optic nerve head and the macula

Josefina Reñones de Abajo , Beatriz Estévez Jorge , Jesús María González Martín , Humberto Carreras Díaz , Juan Francisco Loro Ferrer , Alfonso Antón López

2019, 12(6):961-966. DOI: 10.18240/ijo.2019.06.13

[Abstract](1443) [HTML](232) [PDF 589.79 K](598)

Abstract:
AIM: To evaluate the effect of femtosecond laser-assisted lens surgery (FLALS; cataract surgery or refractive lens exchange) on the structure of the optic nerve head and the macula. METHODS: This prospective longitudinal study included healthy eyes undergoing FLALS. Eyes with glaucoma or any other ocular disease that could alter optical coherence tomography results were excluded. Retinal nerve fiber layer (RNFL), Bruch’s membrane opening-minimum rim width (BMO-MRW) and macular thickness (MT) were measured preoperatively, 1 and 6mo after surgery using spectral-domain optical coherence tomography (SD-OCT). Changes between preoperative and postoperative values were evaluated. RESULTS: A total of 87 eyes of 46 patients were included in this study. Preoperative RNFL, BMO-MRW and MT in microns (µm) were 100.77±10.39, 330.31±49.99 and 276.30±33.39, respectively. Postoperative RNFL, BMO-MRW and MT were 104.74±11.55, 348.32±54.05 and 279.83±22.65 1mo after surgery and 102.93±11.17, 343.11±53.4 and 278.90±22.19 6mo after surgery, respectively; which equals an increase of 3.93%, 5.45% and 1.27%, respectively, 1mo after surgery, and 2.14%, 3.87% and 0.94% 6mo after surgery. The differences between the preoperative and the postoperative RNFL and BMO-MRW values were statistically significant (P<0.001). Regarding MT values, there were not statistically significant differences (P=0.26). CONCLUSION: Our study suggests that FLALS does not have a negative impact on the structural status of the optic nerve head in healthy eyes, assessed by SD-OCT. There is a slight increase in the values of RNFL, BMO-MRW and MT 1mo and 6mo after surgery.

14 Changes in intraocular pressure after intraocular eye surgery—the influence of measuring technique

Hrvoje Kovacic , Roger C.W. Wolfs , Emine K&inodot;l&inodot;ç , Wishal D. Ramdas

2019, 12(6):967-973. DOI: 10.18240/ijo.2019.06.14

[Abstract](885) [HTML](217) [PDF 665.76 K](588)

Abstract:
AIM: To investigate the changes in intraocular pressure (IOP) before and after intraocular surgery measured with Goldmann applanation tonometry (GAT) and pascal dynamic contour tonometry (PDCT), and assessed their agreement. METHODS: Patients who underwent trans pars plana vitrectomy (TPPV) with or without cataract extraction (CE) were included. The IOP was measured in both eyes with GAT and PDCT pre- and postoperatively, where the non-operated eyes functioned as control. RESULTS: Preoperatively, mean IOP measurements were 16.3±6.0 mm Hg for GAT and 12.0±2.8 mm Hg for PDCT for the operated eyes. Postoperatively, the mean IOP dropped to 14.3±5.6 mm Hg for GAT (P=0.011) and rose up to 12.7±2.6 mm Hg for PDCT (P=0.257). Bland-Altman analysis showed a poor agreement between GAT and PDCT with a mean difference of 2.9 mm Hg preoperatively and 95% limits of agreement ranging from -3.2 to 9.0 mm Hg. Postoperatively, the mean difference was 1.2 mm Hg with 95% limits of agreement ranging from -8.3 to 10.7 mm Hg. There were no significant differences between the TPPV and TPPV+CE group, except when measured with PDCT postoperatively (P=0.012). CONCLUSION: The IOP is reduced after surgery when measured with GAT and remained stable when measured with PDCT. However, the agreement between GAT and PDCT is poor. Although PDCT may be a more accurate predictor of the true IOP, it seems less suitable for daily use in the clinical practice.

15 Combined treatment of phacoemulsification and single-port limited pars plana vitrectomy in acute angle-closure glaucoma

Ha Jeong Noh , Seong Taeck Kim

2019, 12(6):974-979. DOI: 10.18240/ijo.2019.06.15

[Abstract](1192) [HTML](234) [PDF 394.13 K](542)

Abstract:
AIM: To evaluate the efficacy of combined treatment of phacoemulsification (PE) and micro-incisional single-port transconjunctival limited pars plana vitrectomy (PPV) in acute angle-closure glaucoma (AACG). METHODS: A retrospective study included 26 patients who underwent PE diagnosed with AACG. Among them, 16 patients (16 eyes) underwent PE alone, 10 patients (10 eyes) underwent combined limited vitrectomy and PE. Then we compared intraocular pressure (IOP), anterior chamber angle, anterior chamber depth, central corneal thickness and corneal endothelial cell count before and after surgery, and effective PE time during cataract surgery. RESULTS: Effective PE time was shorter in the combined surgery group than in the single surgery group (P=0.040). There was no statistically significant difference in IOP and best-corrected visual acuity between the two groups postoperatively. At 6mo postoperatively, there was no difference in the anterior chamber angle, anterior chamber depth, and central corneal thickness between two groups, but corneal endothelial cell count was higher in the combined surgery group than in the single surgery group (P=0.046). No complication such as vitreoretinal disease, endophthalmitis, bullous keratopathy was noted. CONCLUSION: Combined micro-incisional single-port transconjunctival limited PPV and PE are more effective and safer than PE alone because of less operation time and fewer complications for management of AACG.

16 Focal choroidal excavation complicated with choroidal neovascularization in young and middle aged patients

Wen-Yi Tang , Ting Zhang , Qin-Meng Shu , Chun-Hui Jiang , Qing Chang , Hong Zhuang , Ge-Zhi Xu

2019, 12(6):980-984. DOI: 10.18240/ijo.2019.06.16

[Abstract](1365) [HTML](227) [PDF 1.08 M](577)

Abstract:
AIM: To investigate the clinical and optical coherence tomography (OCT) features of focal choroidal excavation (FCE) complicated with choroidal neovascularization (CNV) in young and middle aged patients. METHODS: We performed a retrospective review of 26 patients with FCE accompanied by CNV. All patients underwent a complete ophthalmic examination. We analyzed the clinical characteristics of patients, focusing on the spectral-domain OCT features. All patients received intravitreal injection of anti-vascular endothelial growth factor (anti-VEGF) agents. And we assessed the changes of central retinal thickness and best-corrected visual acuity (BCVA) after anti-VEGF therapy. RESULTS: The mean age of 26 patients was 35.5±7.3y (range, 21-48y). Of the 26 FCE lesions, 11 were located subfoveal, 6 were parafoveal, and 9 were extrafoveal. The mean FCE depth was 129.8±50.3 μm, and the mean width was 901.3±306.0 μm. The FCE depth was correlated positively with the width, but not correlated with age or refractive error. CNV was located within the excavation (19 eyes) or adjacent to the excavation (7 eyes). After anti-VEGF therapy, the central retinal thickness was significantly reduced and the BCVA was significantly improved. In the absorption process of subretinal fluid, we found that the fluid in the excavations needed to be absorbed at the last. A small amount of residual fluid could still be seen in a few deep excavations even after a long-term follow-up. CONCLUSION: FCE may be an important reason to cause CNV. Especially in young patients with idiopathic CNV, we should pay attention to the use of OCT to check the presence of FCE. Anti-VEGF therapy is generally effective for CNV associated with FCE.

17 Renal function and choroidal thickness using swept-source optical coherence tomography in diabetic patients

Antonio Manuel Garrido-Hermosilla , Mariola Méndez-Muros , Estanislao Gutiérrez-Sánchez , Cristóbal Morales-Portillo , María Jesús Díaz-Granda , Eduardo Esteban-González , Isabel Relimpio-López , María Asunción Martínez-Brocca , Enrique Rodríguez-de-la-Rúa-Franch

2019, 12(6):985-989. DOI: 10.18240/ijo.2019.06.17

[Abstract](1481) [HTML](232) [PDF 646.92 K](595)

Abstract:
AIM: To assess the relationship between choroidal thickness and renal function in diabetic patients. METHODS: Cross-sectional retrospective clinical study of 42 eyes of 21 ocular treatment-naïve diabetic patients. Demographic data included: age, sex, type and course of diabetes. Ocular data included: severity of diabetic retinopathy; retinal thickness at the central macular region, as well as choroidal thickness at the central and paracentral quadrants, using automatically generated maps by swept-source optical coherence tomography; presence of cystic macular edema; and ocular axial length (AXL). Lab-test parameters included: glycated hemoglobin (HbA1c), albuminuria, albumin/creatinine ratio in urine, and glomerular filtration rate. RESULTS: A significant negative correlation was mainly observed between several choroidal thicknesses, age (P<0.020) and ocular AXL (P<0.030). On the contrary, a significant positive correlation was found between all choroidal thicknesses, HbA1c (P<0.035) and albuminuria (P<0.040). CONCLUSION: Choroidal thickness can represent an additional tool to help clinicians predicting the renal status in ocular treatment-naïve diabetic patients.

18 Disorganization of the retinal inner layers as a prognostic factor in eyes with central retinal artery occlusion

Hayati Yilmaz , Ali H. Durukan

2019, 12(6):990-995. DOI: 10.18240/ijo.2019.06.18

[Abstract](1000) [HTML](231) [PDF 1.15 M](565)

Abstract:
AIM: To evaluate baseline foveal disorganisation of retinal inner layers (DRIL) as a prognostic factor in eyes with central retinal artery occlusion (CRAO). METHODS: Twenty-eight CRAO patients who were followed-up between 2010 and 2016 were retrospectively investigated. Demographic characteristics and detailed ophthalmological examination findings of all patients were recorded. Macular thicknesses (MTs) from 5 separate spots and DRIL were measured with spectral-domain optic coherence tomography (SD-OCT). Correlations between DRIL score and logMAR converted visual acuity (VA), change in VA, patient reference time (RT), number of hyperbaric oxygen therapy (HBOT) sessions, MT and MT change were investigated. RESULTS: There was a positive correlation between the DRIL score and the final VA (r=0.787) and a negative correlation with the change in VA (r=-0.763). The RT and MT were closely related to the DRIL score. A negative correlation was found between the number of HBOT sessions and the DRIL score (r=-0.341). CONCLUSION: The DRIL score is a parameter assessed by SD-OCT, which can provide us reliable information regarding the prognosis of visual functions and response to the treatment for CRAO patients at acute phase.

19 International multi-center study of iatrogenic retinal tears in pars plana vitrectomy

Omar A. Saleh , Rami A. Al-Dwairi , Hasan Mohidat , Denis Jusufbegovic , Brooke Nesmith , Yoreh Barak , Michael Mimouni , Shlomit Schaal

2019, 12(6):996-1000. DOI: 10.18240/ijo.2019.06.19

[Abstract](1099) [HTML](235) [PDF 301.08 K](566)

Abstract:
AIM: To study and compare the effect of different surgical settings on the development of iatrogenic retinal tears (IRT) in conventional (20-gauge) and microincisional vitrectomy. METHODS: An international retrospective comparative study of 394 patients who had simple vitrectomy at three tertiary centers. Surgeries were performed by four retina surgeons using different viewing systems. Two groups of eyes were compared: microincisional vitrectomy (327 eyes) and conventional (67 eyes) vitrectomy. An iatrogenic tear was defined as the occurrence of one or more peripheral retinal tears during surgery or at any visit in the first 6wk postoperatively. RESULTS: Mean age was 67±12y and 55% were female. Iatrogenic tears occurred in 11/394 (2.8%) of eyes. The rate of tears was similar among different surgeons and viewing systems (P=0.93 and P=0.76, respectively). Surgical indication, preexisting pseudophakia/aphakia, induction of posterior vitreous detachment (PVD) during surgery, and the use triamcinolone acetonide didn’t significantly affect the rate of tears (P>0.1 for all factors). A higher rate of tears was found in the conventional group compared to the microincisional group (respectively, 7.5%, 1.8%, P=0.02). CONCLUSION: The rate of IRT in vitrectomy is not significantly affected by surgical indication, preexisting PVD or pseudophakia, or use of triamcinolone or different viewing systems but is significantly higher in conventional vitrectomy. Microincisional platforms improve the safety of vitrectomy regardless of the viewing system used.

20 B-scan ultrasound and cytology of the vitreous in primary central nervous system lymphoma with vitreoretinal involvement

Jie Lai , Kun Chen , Hui-Min Shi , Lin Zhuang , Xian Zhou , Jian-Jiang Xiao , Yi Li , Bo-Bin Chen , Qing-Ping Wang

2019, 12(6):1001-1007. DOI: 10.18240/ijo.2019.06.20

[Abstract](1536) [HTML](230) [PDF 1.03 M](603)

Abstract:
AIM: To evaluate the diagnostic value of B-scan ultrasound and explore the cytological characteristics of patients with vitreoretinal lymphoma (VRL) and primary central nervous system lymphoma (PCNSL). METHODS: The clinical data and pathologic specimens from patients with VRL diagnosed at the North Huashan Hospital from 2016 to 2017 were retrospectively reviewed. The patients were diagnosed by slit lamp ophthalmoscopy, B-scan ultrasound, cytology of the vitreous, which was obtained by vitrectomy, and cytokine measurements of interleukin (IL)-10 and IL-6. RESULTS: Twenty-six eyes (19.4%) out of 134 eyes of 67 patients (47 men and 20 women) with PCNSL were diagnosed with VRL by B-scan ultrasound, and 14 eyes (10.4%) were diagnosed by slit lamp ophthalmoscopy. Twenty-four eyes (17.9%) of 17 patients were confirmed as having VRL with cytology. No difference in the association between intracranial lesion location and ocular involvement was found. VRL patients had higher levels of vitreous IL-10 and IL-10/IL-6 when compared with macular hole cases, but the difference was not statistically significant. CONCLUSION: A total of 25.4% of the PCNSL patients had VRL, B-scan ultrasound examination had characteristic features and is recommended over slit lamp ophthalmoscopy for the screening diagnosis of PCNSL with intraocular involvement. Moreover, the cytological and immunohistochemical analyses performed after 25-gauge diagnostic vitrectomy were accurate diagnostic techniques.

21 The impact of GJA3 SNPs on susceptibility to age-related cataract

Xia-Jing Tang , Xing-Chao Shentu , Ye-Lei Tang , Xi-Yuan Ping , Xiao-Ning Yu

2019, 12(6):1008-1011. DOI: 10.18240/ijo.2019.06.21

[Abstract](933) [HTML](235) [PDF 345.80 K](546)

Abstract:
AIM: To determine the association of gap junction protein alpha 3 (GJA3) gene tag single-nucleotide polymorphisms (SNPs) with susceptibility to age-related cataract (ARC). METHODS: In total, 486 ARC patients were matched with 500 healthy controls. All the participants underwent complete ophthalmic examinations. Haplotype-tagging SNPs of GJA3 gene were selected from the HapMap Beijing Han Chinese population. Genomic DNA was extracted from the peripheral blood leukocytes of all the subjects. Under three different genetic models: dominant, recessive, and additive, the association between SNPs and ARC was examined. After adjusting for age and sex, the genetic effects of the GJA3 SNPs were evaluated with logistic regression analysis. RESULTS: Four tag GJA3 SNPs (rs6490519, rs9506430, rs9509053, and rs9552089) were included in the present study. None of the SNPs showed a significant relationship with an altered risk of total ARC under the dominant, recessive, or additive models. In the subgroup analysis, rs9506430 had a significant effect on the formation of a posterior subcapsular cataract (P=0.002, OR: 0.227, 95%CI: 0.088-0.590) under the recessive model. CONCLUSION: Our study indicates that GJA3 variants may influence the development of posterior subcapsular cataracts. Further studies need to be designed to confirm this possibility.

22 Segmentation of retinal fluid based on deep learning: application of three-dimensional fully convolutional neural networks in optical coherence tomography images

Meng-Xiao Li , Su-Qin Yu , Wei Zhang , Hao Zhou , Xun Xu , Tian-Wei Qian , Yong-Jing Wan

2019, 12(6):1012-1020. DOI: 10.18240/ijo.2019.06.22

[Abstract](1868) [HTML](216) [PDF 2.24 M](703)

Abstract:
AIM: To explore a segmentation algorithm based on deep learning to achieve accurate diagnosis and treatment of patients with retinal fluid. METHODS: A two-dimensional (2D) fully convolutional network for retinal segmentation was employed. In order to solve the category imbalance in retinal optical coherence tomography (OCT) images, the network parameters and loss function based on the 2D fully convolutional network were modified. For this network, the correlations of corresponding positions among adjacent images in space are ignored. Thus, we proposed a three-dimensional (3D) fully convolutional network for segmentation in the retinal OCT images. RESULTS: The algorithm was evaluated according to segmentation accuracy, Kappa coefficient, and F1 score. For the 3D fully convolutional network proposed in this paper, the overall segmentation accuracy rate is 99.56%, Kappa coefficient is 98.47%, and F1 score of retinal fluid is 95.50%. CONCLUSION: The OCT image segmentation algorithm based on deep learning is primarily founded on the 2D convolutional network. The 3D network architecture proposed in this paper reduces the influence of category imbalance, realizes end-to-end segmentation of volume images, and achieves optimal segmentation results. The segmentation maps are practically the same as the manual annotations of doctors, and can provide doctors with more accurate diagnostic data.

23 Axial length/corneal radius of curvature ratio and refractive development evaluation in 3- to 4-year-old children: the Shanghai Pudong Eye Study

Ke-Ke Zhao , Yuan Yang , Hong Wang , Lu Li , Zhao-Yang Wang , Fan Jiang , Ji-Fang Qu

2019, 12(6):1021-1026. DOI: 10.18240/ijo.2019.06.23

[Abstract](1475) [HTML](223) [PDF 715.26 K](690)

Abstract:
AIM: To measure and analysis axial length (AL)/corneal radius of curvature (CRC) ratio and other refractive parameters, provide a medical reference range for refractive development evaluation and earlier visual impairment screening of 3 to 4y kindergarten students. METHODS: Between April and June 2017, a total of 4350 participants aged 3- to 4-year-old (8700 eyes) from 10 cluster random sampling kindergartens in Shanghai, Pudong District were involved. According to the measurement and analysis of the unaided visual acuity (VA), AL, CRC, AL/CRC ratio, astigmatism and other refractive parameters, the data distribution and reference range were obtained. RESULTS: Uncorrected VA of examined children was 0.23±0.08 (logMAR, mean±SD) [95% confidence interval (CI) range ≤0.36]; AL was 22.10±0.79 mm (95%CI 20.55-23.65); CRC was 7.86±0.26 mm (95%CI, 7.35-8.37); AL/CRC ratio was 2.81±0.12 (95%CI, 2.57-3.05). The median of astigmatism was -0.5 D, a total of 56.3% had astigmatism <-0.50 D, 85.3%<-1.00 D, 6.7%>-1.50 D; 71% were astigmatism with the rule. Eye-specific analyses were conducted. Statistical difference of VA was in right and left eyes. There were no significant differences between two eyes of AL, CRC, AL/CRC ratio and astigmatism (P>0.05). CONCLUSION: VA and AL/CRC ratio reference could be used to assess refractive development in children and screening uncorrected refractive errors or amblyopia. Astigmatism needs to be considered in the diagnosis.

24 [THIS ARTICLE HAS BEEN RETRACTED]The efficacy and safety of besifloxacin for acute bacterial conjunctivitis: a Meta-analysis

Jun-Jie Wang , Xin-Yi Gao , Hong-Zhuo Li , Shan-Shuang Du

2019, 12(6):1027-1036. DOI: 10.18240/ijo.2019.06.24

[Abstract](1688) [HTML](0) [PDF 2.88 M](605)

Abstract:
[THIS ARTICLE HAS BEEN RETRACTED] AIM: To evaluate the relative efficacy and safety of besifloxacin for treatment of acute bacterial conjunctivitis. METHODS: A comprehensive search in PubMed, EMBASE Web of Science, Cochrane Central Database and CNKI was undertaken for randomized controlled trials (RCTs) comparing besifloxacin with other treatments or placebo. The primary outcome measures were clinical resolution, rates of bacterial eradication, individual clinical outcomes, cure rates, and bacterial eradication rates of different kinds of pathogens. Safety outcomes were the number of adverse effects (AEs). The final search was performed on August 2018. RESULTS: Eight RCTs were included. Five studies compared the efficacy and safety of besifloxacin with placebo, 2 studies compared besifloxacin with moxifloxacin, and 1 study compared besifloxacin with gatifloxacin. A total of 3105 patients met the inclusion criteria. Besifloxacin presented higher efficacy and safety than did placebo in clinical resolution, rates of bacterial eradication, individual clinical outcomes, cure rates, bacterial eradication rates of different kinds of pathogens and the number of AEs. There was no significant difference between besifloxacin and moxifloxacin or gatifloxacin in the comparison items mentioned above. CONCLUSION: Besifloxacin is highly effective and safe for treatment of acute bacterial conjunctivitis. Further comparative trials regarding the effect of besifloxacin for treatment of acute bacterial conjunctivitis will aid in treatment decisions.

25 Visual problems: a review of prevalence studies on visual impairment in school-age children

Uchenna C. Atowa , Rekha Hansraj , Samuel O. Wajuihian

2019, 12(6):1037-1043. DOI: 10.18240/ijo.2019.06.25

[Abstract](2292) [HTML](246) [PDF 310.50 K](775)

Abstract:
Childhood visual impairment (VI) have a significant impact on the educational achievement, career choices and social life of affected individual, and in children, is mainly due to either preventable or treatable causes. Reliable data on the prevalence and causes of VI in children will guide the development of a systematic vision screening program for its early detection and successful treatment of possible causes. The purpose of this literature review is to summarize the available data on prevalence and causes of VI in school-age children from various regions globally. A discussion on the major findings highlighting the definition criteria, classifications and limitations for further studies is also presented.

26 Ascher syndrome: a rare case of blepharochalasis combined with double lip and Hashimoto’s thyroiditis

Zhan-Lin Zhao , Sheng-Ming Wang , Chun-Yi Shao , Yao Fu

2019, 12(6):1044-1046. DOI: 10.18240/ijo.2019.06.26

[Abstract](1450) [HTML](225) [PDF 958.13 K](568)

Abstract:

27 Incomplete capsulotomy and lens fragmentation during femtosecond laser-assisted cataract surgery associated with emulsified anterior chamber silicone oil: a case report

Wei Chen , Yong Wang , Jian Wu , Huai-Jin Guan

2019, 12(6):1047-1049. DOI: 10.18240/ijo.2019.06.27

[Abstract](1285) [HTML](229) [PDF 968.79 K](568)

Abstract:

28 Ocular hypertension secondary to obesity: cortisol, the missing piece of the pathophysiological puzzle?

Andrej Belan&ccaron;i&cacute; , Marija Krpina , Sanja Klobu&ccaron;ar Majanovi&cacute; , Maja Merlak

2019, 12(6):1050-1051. DOI: 10.18240/ijo.2019.06.28

[Abstract](1100) [HTML](221) [PDF 268.93 K](558)

Abstract:

29 Increased intracranial pressure and macular thickening: is there a link?

Hamid Sajjadi , Hossein Poorsalman , Mohammad-Ali Abtahi

2019, 12(6):1052-1055. DOI: 10.18240/ijo.2019.06.29

[Abstract](729) [HTML](239) [PDF 3.43 M](598)

Abstract:

30 Comment on “Role of corneal collagen fibrils in corneal disorders and related pathological conditions”

Khosrow Jadidi , Hossein Aghamollaei

2019, 12(6):1056-1056. DOI: 10.18240/ijo.2019.06.30

[Abstract](994) [HTML](221) [PDF 201.12 K](511)

Abstract:

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Volume 12,Issue 6,2019 Table of Contents