Changes in rotation after implantation of a bag-in-the-lens intraocular lens
Received 9 January 2009; received in revised form 5 March 2009; accepted 5 March 2009.
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 (r2 = 0.011) or IOL power (r2 = 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.
From the Department of Ophthalmology, Antwerp University Hospital, Edegem, Belgium
Corresponding author: Jos J. Rozema, PhD, Department of Ophthalmology, Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium.
Dr. Tassignon has an intellectual proprietary interest in the bag-inthe-lens intraocular lens (US patent 6.027.531). No other author has a financial or proprietary interest in any material or method mentioned.
ABSTRACT