POSTERIOR CHAMBER COLLAMER PHAKIC INTRAOCULAR LENS (ICL V4C AND V5) IN DIFFERENT DEPTHS OF ANTERIOR CHAMBER – A COMPARATIVE STUDY

Published 2022 - 26th ESCRS Winter Meeting

Reference: P098 | Type: Abstracts | DOI: 10.82333/0req-jw25

Authors: Christophe Pinto* ¹ , Tiago Monteiro ¹ , Fernando Faria Correia ¹ , Nuno Franqueira ¹ , José Mendes ¹ , Carlos Cruz ¹ , Rui Silva ¹ , Álvaro Silva ¹ , Fernando Vaz ¹

¹Ophthalmology,Hospital de Braga,Braga,Portugal

Purpose

Phakic intraocular lens implantation for the treatment of myopia is an effective and safe surgical procedure, whose complication rate may vary depending on the anatomical characteristics of the anterior segment. This study aims to evaluate the efficacy, safety and predictability of the central-hole posterior chamber collamer phakic intraocular lens implantation in two groups of patients - anterior chamber depth (ACD) below and above 3.00 mm.

Setting

Ophthalmology Department, Hospital de Braga, Braga, Portugal

Methods

This retrospective cohort study included all consecutive patients submitted to posterior chamber collamer phakic intraocular lens implantation (ICL V4C and V5) that completed a 12-month postoperative follow-up. Inclusion criteria were an age ≥ 20 years, refraction stability > 12 months, no previous eye surgeries, ACD measured from the endothelium equal ≥ 2.80 mm and minimum postoperative follow-up of 12 months. Two groups of patients were defined according to the preoperative ACD - Group 1 (ACD up to 2.99 mm) and Group 2 (ACD equal to or greater than 3.00 mm). Uncorrected (UCVA) and best-corrected (BCVA) visual acuity, subjective refraction, efficacy and safety index, predictability curve, mean endothelial density, mean static central vault and postoperative complications were evaluated preoperatively and at 12 months postoperatively.

Results

A total of 558 eyes from 298 patients were evaluated - 111 eyes (19.9%) in group 1 (mean ACD 2.91 ± 0.06 mm) and 447 eyes (80.1%) in group 2 (mean ACD 3.31 ± 0.23 mm). The preoperative value of spherical equivalent (SE) to be treated was -9.40 ± 3.17 in group 1 and -8.02 ± 3.48 (p<0.001) in group 2. In group 1, 80.7% of the implanted lenses were 12.60 mm in diameter, while in group 2, 32.3% were 12.60 mm and 58.4% were 13.20 mm. At 12-months postoperatively, the mean postoperative SE was identical in both groups (p=0.50). The efficacy index was similar in both groups (p=0.26); the safety index was higher in group 1 (p=0.03). The mean central vault at 12 months was significantly lower in group 1 (252 ± 154 um) than in group 2 (431 ± 220 um) (p<0.001). There were no significant differences in endothelial cell loss at 12 months or in the rate of complications observed (p=0.31 and p=0.77, respectively).

Conclusion

Posterior chamber collamer phakic intraocular lens implantation is an effective and safe procedure in narrow anterior chambers (2.80 to 3.00 mm), with visual and refractive results and complication rate identical to those obtained in chambers greater than 3.00 mm.