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Compensation for corneal aberrations increases after LASIK
J Refract Surg. 2010;26(5):333-340.
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The internal aberrations of the eye compensate for corneal aberrations after myopic LASIK surgery, a study found.
Fifty-seven eyes of 57 patients were measured preoperatively and 3 months postoperatively to compare corneal aberrations and total ocular aberrations of eyes undergoing myopic LASIK. According to the study authors, "These measurements were used to determine whether the sudden decoupling of higher-order aberrations due to LASIK unlocked a compensatory process that minimized the amount of induced aberrations after surgery."
At 3 months, total higher-order aberrations increased by a factor of 1.77 and corneal aberrations increased by a factor of 2.47. Specifically, total coma aberration increased by a factor of 2.43 and corneal coma aberration increased by a factor of 2.56, while total spherical aberration increased by a factor of 1.46 and corneal spherical aberration increased by a factor of 2.64.
"We found that corneal aberrations were higher than the total aberrations both pre- and postoperatively. A decrease in the magnitude of the total eye aberrations indicates some degree of compensation by the internal optics, as corneal and internal aberrations combine to give total eye coefficients. The results of our study indicate that internal aberrations continue to reduce the impact of the induced corneal wavefront changes after LASIK," the authors said.
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