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What is A.K. or astigmatic keratotomy?

AK is a variation of RK where incisions are placed in the peripheral cornea to reduce or eliminate astigmatism. Astigmatism is a condition of the cornea in which the corneal shape is oval instead of round. This causes the light to focus in an odd blurred shape on the retina. AK is used with RK in nearsightedness with astigmatism or in other conditions such as after cataract surgery or corneal transplant surgery that leaves the patient's vision blurred by an "oval" cornea.

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