Anterior keratometric curvature data lead to some amount of overcorrection or undercorrection with toric IOLs if information on posterior corneal astigmatism is not incorporated. However, the effect of posterior corneal astigmatism is not clinically significant when the IOL cylinder power is greater than 2.5 D, according to a study.
Retrospective data were collected for 113 eyes of 101 patients who underwent lens surgery with toric IOL implantation. The required cylinder power was 2.5 D or greater, and eyes with both with-the-rule (WTR) and against-the-rule (ATR) astigmatism were included.
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