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Adjusting intraocular lens power for sulcus fixation
Chikako Suto1, Sadao Hori, Eriko Fukuyama
1Department of Ophthalmology, Tokyo Women's Medical University, Tokyo, Japan. chikakos@pastel.ocn.ne.jp
Journal of Cataract and Refractive Surgery
|November 8, 2003
Summary
For sulcus fixation intraocular lens (IOL) power, reduce the predicted value by 1.00 diopter compared to in-the-bag fixation. This correction ensures accurate refractive outcomes in patients undergoing sulcus fixation surgery.
Area of Science:
- Ophthalmology
- Biomedical Engineering
Background:
- Intraocular lens (IOL) power calculation requires precise prediction for optimal visual outcomes.
- Sulcus fixation of IOLs presents unique challenges in power calculation compared to in-the-bag fixation.
Purpose of the Study:
- To determine the appropriate correction of predicted intraocular lens (IOL) power for sulcus fixation.
- To prospectively validate the correction value in patients undergoing sulcus fixation.
Main Methods:
- Retrospective analysis of 30 eyes with normal axial length undergoing sulcus fixation.
- Evaluation of postoperative refraction, virtual in-the-bag IOL power, predicted refraction, and effective lens position (ELP).
- Prospective confirmation in 16 additional eyes requiring sulcus fixation.
Main Results:
- A significant myopic shift occurred after sulcus fixation (mean 0.78 D).
- Virtual IOL power was higher than actual sulcus-fixated IOL power (mean difference 1.11 D).
- Reducing planned IOL power by 1.00 D for sulcus fixation resulted in minimal refractive error (mean -0.06 D) in the prospective study.
Conclusions:
- For sulcus fixation in eyes with normal axial length, reduce IOL power by 1.00 D compared to in-the-bag fixation.
- This correction aims to achieve accurate refractive outcomes after sulcus fixation IOL implantation.