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PRK may be less biomechanically invasive than LASIK to correct myopia

Cornea. 2009;28(7):765-769.

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The biomechanical properties of the cornea were altered by PRK and LASIK procedures, but LASIK had more of an impact on those properties than PRK, a study found.

"Both PRK and LASIK can affect the biomechanical strength of the cornea depending on the amount of myopic correction," the authors said. "The amount of biomechanical changes is larger after LASIK than after PRK. From a biomechanical viewpoint, PRK may be a less invasive surgical approach for the correction of myopia than LASIK."

The retrospective study looked at 27 eyes of 16 patients that had PRK and 31 eyes of 16 patients that underwent LASIK for myopic correction. Corneal hysteresis and corneal resistance factor were measured preoperatively and 3 months postoperatively with the Ocular Response Analyzer (Reichert).

Researchers found that both corneal hysteresis and corneal resistance factor decreased significantly after PRK and LASIK. They also found a significant correlation in the amount of myopic correction and biomechanical property changes after PRK and LASIK.