Dysphotopsia and functional quality of vision after implantation of an intraocular lens with a 7.0 mm optic and plate haptic design

Abstract

Purpose: To determine the impact of an intraocular lens (IOL) with a 7.0 mm optic and plate haptic design on incidence of dysphotopsia and visual functions after cataract surgery.

Setting: Day-care clinic.

Design: Prospective monocentric randomized patient-blinded comparative clinical study.

Methods: Following preoperative measurements, patients underwent cataract surgery with implantation of 2 IOL designs-with 7.0 mm optic and plate haptics (Group 1) or with 6.0 mm optic and C-loop haptics (Group 2). In month 1, 3, and 12 follow-ups, patients were examined, answered a questionnaire regarding satisfaction, spectacle dependence, frequency, and extent of positive and negative dysphotopsia, and underwent contrast sensitivity (CS), mesopic vision, and glare sensitivity testing. The data were analyzed as nominal, ordinal, and metric with chi-square, Mann-Whitney U, Wilcoxon, and t tests.

Results: Out of a total number of 120 eyes (86 patients), Group 1 comprised 57 eyes (43 patients), Group 2 comprised 63 eyes (43 patients). Corrected distance visual acuity was the same between groups throughout the study. Group 1 showed significantly lower incidence of positive and negative dysphotopsia in month 1 follow-up (P = .021 and .015, respectively) and a higher satisfaction rate in month 3 follow-up (P = .006). Mean CS and mesopic vision with and without glare were the same in both groups. Positive dysphotopsia cases in month 12 follow-up revealed lower photopic CS (P = .005, .036, and 0.047, respectively), longer axial length, and greater preoperative pupil dynamics (P = .04 and .06).

Conclusions: The IOL design with 7.0 mm optic diameter and plate haptics reduced dysphotopsia and provided good visual acuity, CS, mesopic vision with and without glare, and high patient satisfaction.