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It’s been shown that refractive results in flap-based and PRK-based procedures are comparable in mild-to-moderate myopia patients but are better in high-myopia patients. Astigmatism is the refractive error caused by optical aberrations of the cornea and/or lens from a perfectly spherical refractive configuration. Eyeglasses or contacts tend to be effective treatments for astigmatism. In PRK,…