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Topography-based LRIs may be more precise than conventional LRIs

J Refract Surg. 2011;27:339-344.

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A novel topography-based method of performing limbal relaxing incision surgery may be more precise than the conventional method, a study suggested.

In the topography-based method, the surgeon places a mark on the cornea and conjunctiva, identifies the mark in the topographic image, then performs a limbal relaxing incision (LRI) based on the mark's location.

Forty-four eyes of 36 consecutive patients with at least 2 D of refractive against-the-rule astigmatism who had undergone cataract surgery at least 1 month prior and were scheduled to undergo LRI surgery were divided into two groups: conventional or topography-based LRI surgery.

Both groups showed a statistically significant decrease in regular astigmatism 1 month after surgery (P < .0001 for conventional LRI; P = .014 for topography-based LRI).

The topography-based LRI group had a lower standard deviation of regular astigmatism after surgery, suggesting that the reduction in regular astigmatism may occur in a more constant manner with topography-based LRI than with conventional LRI, the study authors said.