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Changes in straylight, contrast sensitivity similar after wavefront-guided PRK and LASIK, study says

J Refract Surg. 2010;26(8):588-593.

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Despite a significant rise in higher-order aberrations following wavefront-guided LASIK or wavefront-guided PRK, there appears to be no difference in intraocular straylight or contrast sensitivity after treatment, according to a study.

In a prospective, randomized study of 22 eyes of 11 patients, with one eye receiving wavefront-guided LASIK and the other wavefront-guided PRK, mean uncorrected visual acuity was –0.06 logMAR in the LASIK eye and –0.10 logMAR in the PRK eye. Mean straylight values changed similarly after each procedure: 0.94 log s at baseline to 1.01 log s at 12 months in the LASIK eye, and 0.96 log s at baseline to 0.97 log s at 12 months in the PRK eye.

Contrast sensitivity, measured under both mesopic and photopic conditions, was not significantly different between the two groups. Coma and spherical aberration increased significantly at 12 months compared with baseline in both groups, but the difference between groups was not statistically significant.