EFFICACY AND SAFETY OF POSTERIOR CHAMBER COLLAMER PHAKIC INTRAOCULAR LENS (ICL V4C AND V5) IMPLANTATION FOR LOW MYOPIA

To evaluate visual, refractive and safety outcomes of central-hole posterior chamber collamer phakic intraocular lens (ICL V4C and V5) implantation for low myopia.

Ophthalmology Department, Hospital de Braga, Braga, Portugal

This retrospective cohort study included 106 eyes submitted to posterior chamber collamer phakic intraocular lens (ICL V4C and V5) implantation that completed a 12-month postoperative follow-up. All eyes included were diagnosed with low myopia - spherical equivalent of -6.00D or less. Effectiveness, predictability, stability and safety outcomes were evaluated preoperatively and at 1, 6 and 12 months postoperatively.

Preoperatively, corrected distance visual acuity (CDVA) was 0.04 ± 0.14 logMAR with a manifest spherical equivalent (SE) of -4.89 ± 0.99 D. At 1-year postoperative, logMAR CDVA was -0.01 ± 0.12, with a safety index of 1.13 ± 0.18. Postoperative logMAR UDVA was 0.02 ± 0.17, with an efficacy index of 1.05 ± 0.17, and 74 (69.8%) eyes achieved UDVA of 20/20 or better. After 1 year, manifest SE was -0.16 ± 0.47, with 92 (86.8%) eyes within ± 0.50 D of the target. From 1-month to 1-year, manifest SE change was -0.07 ± 0.25. Intraocular pressure did not change significantly. The mean rate of endothelial cell loss was 1.12%. ICL exchange occurred in one case. No vision-threatening complications were reported.

The posterior chamber collamer phakic intraocular lens implantation demonstrated high levels of efficacy and safety, high refractive predictability and stability, with very low incidence of complications for the treatment of low myopia, and can be considered as an alternative refractive option, especially when corneal ablative procedures are not indicated.