Changes in rotation after implantation of a bag-in-the-lens intraocular lens

Abstract

Purpose: To estimate the rotation stability of the bag-in-the-lens (BIL) intraocular lens (IOL) (Morcher 89A) over time and to assess whether the rotational stability of the IOL design is suitable for toric corrections.

Setting: Department of Ophthalmology, Antwerp University Hospital, Edegem, Belgium.

Methods: This prospective study evaluated patients who had cataract surgery and BIL IOL implantation. Postoperative red reflex photographs were taken 1 day, 5 weeks, and 6 months after surgery. Intraocular lens rotation was obtained by defining a triangle between a scleral blood vessel, the IOL haptic, and the IOL optic center. Changes in the triangle during the follow-up were evaluated using purpose-designed software written in MatLab.

Results: Fifty-nine eyes of 49 patients (mean age 68.0 years +/- 11.9 [SD]) were included. There was little postoperative IOL rotation (mean 0.05 +/- 2.02 degrees) between 1 day and 5 weeks (n = 46 eyes) and between 5 weeks and 6 months (mean 0.36 +/- 1.39 degrees) (n = 15 eyes). The IOL rotation remained unchanged from 1 to 6 months postoperatively (P = .327, analysis of variance). There was no correlation between IOL rotation and patient age (r(2) = 0.011) or IOL power (r(2) = 0.003). Postoperative IOL rotations were not different between left eyes and right eyes (P = .862, t test).

Conclusion: The BIL IOL showed good rotation stability, making it suitable for toric correction.