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Poor vision that cannot be corrected fully with glasses may indicate a condition known as conical cornea or keratoconus. A rare condition, keratoconus is a degenerative disorder of the eye that causes structural changes within the cornea. Keratoconus classically begins affecting young adults (ages 10-20) and progressively worsens until about age 40.

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With keratoconus, the cornea, the “clear window” at the front of the eye, may become thin and bow outwards causing the cornea to become shaped like a cone. It is this irregular distortion of the cornea that makes vision correction with glasses less than optimal. For this reason other means of correcting vision are often necessary.



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