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http://en.wikipedia.org/wiki/Keratoconus

Keratoconus is a non-inflammatory thinning and bulging of the cornea. This
bulging results in distortion of the cornea, and an associated reduction in
visual acuity. Corneal scarring occurs in more advanced cases and further
reduces acuity.

This page contains facts and explanations about keratoconus, and hopes to
answer questions more deeply than other resources the patient may have
available.