astigmatism defect of eye ,which can be rectified
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Astigmatism can also be corrected by reshaping the cornea through LASIK (laser in situ keratomileusis) or PRK (photorefractive keratectomy). PRK removes tissue from the superficial and inner layers of the cornea. LASIK removes tissue only from the inner layer of the cornea.
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Cylindrical lens because the person suffering from astigmatism do not able to differentiate between horizontal and vertical things
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