Phakic posterior chamber plate intraocular lenses for high myopia

Abstract

Purpose: Refractive correction of high myopia with phakic minus power intraocular lenses (IOLs) may give dramatic visual results. Various types of lenses developed for this purpose have not gained widespread use due to complications. Long-term results and complications of phakic posterior chamber lenses are yet unknown. The purpose of this study was to evaluate long-term refractive results and complications of early design phakic posterior chamber lenses.

Methods: Thirty-four high myopic eyes implanted with phakic posterior chamber IOLs designed by Fyodorov were evaluated retrospectively. Follow-up time ranged from 36 to 62 months. Corneal endothelial cell counts were made at the central cornea preoperatively and in the sixth month in 18 eyes and in the twelfth month in 14 eyes.

Results: Preoperative refractions were between -7.75 and -21.00 D; refractions at the end of the follow-up period were between -5.75 and +3.00 D. Sixty-three percent of eyes were in the +/-2.00-D range. Endothelial cell loss was 9% at 6 months and 10.22% at 12 month. The difference in endothelial cell counts at 6 and 12 months was not statistically significant.

Conclusions: Early design phakic posterior chamber IOLs implanted in this study were developed by Fyodorov and are not used currently. These IOLs provided a stable and reversible refractive correction without leading to cataract formation. Endothelial loss was limited to surgical trauma. Moderate predictability of refractive correction and frequent decentrations with these lenses were linked to the early design of these IOLs.