Changes in Refraction and the Anterior Chamber Depth According to the Type of Single-piece Intraocular Lens and an Evaluation of the Accuracy of Predicting the Postoperative Refraction

1. Byung Yi Ko, MD
2. Gun Woong Lee, MD

Department of Ophthalmology, College of Medicine, Konyang University, Daejeon, South Korea

Purpose: To evaluate the changes in refraction and the depth of the anterior chamber after cataract surgery according to the type of single-piece intraocular lens (IOL) used, and also to analyze the accuracy of predicting the postoperative refraction.

Methods: Fifty-eight eyes in forty-three patients who underwent cataract surgery with four different types of single-piece IOLs (620H, 570C, SN60AT and SN60WF) were enrolled. The changes of the anterior chamber depth and spherical equivalent over time between the intervals of postoperative one week to one month, one month to two months and two months to six months were evaluated. The relationship between changes of the anterior chamber depth and the spherical equivalent was analyzed. Finally, the changes of the spherical equivalent over the entire interval of one week to six months were evaluated to compare whether the prediction models accurately accounted for the observed values.

Results: A comparison of the changes of the average anterior chamber depth and the refraction showed no significant differences according to the IOL type. There was no significant relation between the changes of the anterior chamber depth and the changes of the refraction. There was a slight myopic shift from the predicted postoperative refraction.

Conclusions: There are no significant differences of refraction and the anterior chamber depth according to the type of IOL used during cataract surgery. However, there were changes in refraction after two months postoperatively and the changes in refraction over time between the spherical IOLs and the aspherical IOL showed significant differences.