AIM: To evaluate the clinical effects and security of posterior chamber implantable Collamer lens(ICL)implantation in patients with extreme highly myopia.

METHODS:In this study, 18 patients(32 eyes)with extreme highly myopic patients who had undergone posterior chamber ICLs implantation from July 2010 to July 2013 were evaluated. Diopter -10.5～19.0D, and astigmia -0.5～4.5DC. Changes in intraocular pressure(IOP), refraction, visual acuity and corneal endothelium, anterior chamber depth, iris, high arch, lens were noted at 1d, 1wk, 1, 3mo and 1a after surgery respectively, and follow-up was of 1a.

RESULTS: Before surgery, the uncorrected visual acuity(UCVA)were 0.01～0.05, and the best spectacle-corrected visual acuity(BSCVA)were 0.4～1.0. One month after surgery, the UCVA were 0.5～1.2. The mean vault were 547±222 μm(95%CI 442～672μm)and 528±268 μm(95%CI 354～635μm)for 1mo and 1a, respectively(P=0.81), and there was no significant difference. Anterior subcapsular opacities in 1 eye, mild and transient increase in IOP in 3 eyes, and chronic pigment dispersion in 2 eyes were observed. There was no serious complication.

CONCLUSION: Posterior chamber phakic intraocular lens implantation is an effective and safe method for correcting patients with extreme highly myopia.