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Abnormal preop corneal topographies may lead to vision loss after refractive surgery

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Patients with corneal topographic abnormalities preoperatively might experience loss of vision after photorefractive keratectomy or LASIK, researchers in Sao Paulo, Brazil, found.

Paulo Schor, MD, and colleagues studied 44 eyes with topographical abnormalities that had undergone PRK and 40 that had undergone LASIK. Topographic abnormalities included apex displacement, asphericity and other findings. A control group comprised 84 paired spherical equivalent normal eyes. Safety and predictability of the two procedures were defined as a postoperative visual acuity of 20/40 or better and the loss of one or more lines of spectacle corrected visual acuity.

All patients were followed for 6 months. There was a significant loss of best corrected visual acuity in patients with certain preop corneal abnormalities. The number of eyes that were within 1 D postoperatively was similar in all groups.

The study is published in the June issue of British Journal of Ophthalmology.