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Contrast sensitivity function temporarily affected after LASIK

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Central corneal microstraie after LASIK can reduce the baseline contrast sensitivity function at medium to high spatial frequencies, even with 20/20 visual acuity, according to a study.

Nadia-Marie Quesnel, OD, MSc, and colleagues at the University of Montreal prospectively studied 34 patients between 18 and 50 years of age who had undergone bilateral LASIK to correct myopia between –1 D and –6.75 D with or without astigmatism less than 2.5 D.

Average pre- and postop contrast sensitivity function did not differ at 1 month. A subgroup that had corneal microstraie had a significant reduction in the photopic and mesopic contrast sensitivity function at 6, 12 and 18 cycles per degree despite normal Snellen visual acuities.

The study is published in the June issue of Journal of Cataract & Refractive Surgery.