Abstract:AIM: To evaluate the clinical feasibility of using a new optical coherence interferometry(IOL-Master), comparing with traditional ultrasonic biometry and manual keratometry in the accuracy and characteristics for intraocular lens calculation of high myopia.
METHODS: The measurement of axial length was performed in 60 eyes(30 eyes for each group)with senile cataract of high myopia(≥-6.00D)using IOL-Master and ultrasonic biometry. The measurement of corneal power(K)was also performed in the patient using IOL-Master and manual keratometry preoperatively. Phacoemulsification and foldable lens implantation were done on the patients. IOL power calculation was carried out according to the SRK/T formula on the basis of the group-related data. Best corrected visual acuity, refraction, contrast sensitivity and wave front aberration root mean square(RMS)were re-tested after 3 months postoperatively.
RESULTS: Significant difference between the two methods in axial length measurement which was 29.81±1.53mm by ultrasound and 29.63±1.81mm by IOL-Master(P=0.001). And in corneal power measurement which was 43.22±1.67K by manual keratometry and 44.27±1.39K by IOL-Master(P=0.006). There was a significant difference between the two groups(P=0.001). 63.0% vs 31.2% had a mean absolute refractive error(MARE)within ±0.50 diopter for the IOL-Master and A-scan groups, respectively(χ2=3.1, P<0.05). The RMS values of 4th order aberration, 4th order spherical aberration and total high order aberration in the IOL-Master group were lower than those in the A-scan group at 6mm pupil diameter 3 months later.
CONCLUSION: IOL-Master is a non-contact, accurate, safe and reliable tool for calculating IOL power and it is more accurate on the design of the IOL in the cataract surgery on the high myopia patients.
