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Myopic, hyperopic LASIK have different patterns of aberrations induction
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Myopic LASIK and hyperopic LASIK resulted in different patterns of higher-order aberration induction, according to a study. Myopic LASIK induced positive spherical aberrations and positive secondary astigmatism, while hyperopic LASIK resulted in negative spherical aberrations and negative secondary astigmatism.
Thomas Kohnen, MD, and colleagues at Johann Wolfgang Goethe-University in Germany retrospectively compared the change in anterior corneal higher-order aberrations induced by myopic and hyperopic LASIK. They examined 100 eyes of 59 patients. The myopic group (50 eyes) had a mean preoperative spherical equivalent of –4.22 D, and the hyperopic group was +2.72 D.
The total higher-order aberrations root mean square (RMS) changed in the myopic group by 0.167 ¼m and in the hyperopic group by 0.341 ¼m. The mean induction of coma RMS was significantly different in both groups (myopes, 0.092 ¼m; hyperopes, 0.252 ¼m). The myopic group showed a significant increase in mean spherical aberration and the hyperopic group showed a significant decrease (P < .001). The hyperopic group showed a greater increase in fifth-order aberrations (0.069 ¼m) than the myopic group (0.005 ¼m).
"Myopic and hyperopic LASIK have different patterns of corneal wavefront changes and several factors govern this change, including the preoperative aberrations and the magnitude of attempted correction,” the study authors wrote.
The study is published in the October issue of Ophthalmology.