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In page Corneal ectatic disorders:

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  • Pellucid marginal degeneration, a bilateral, noninflammatory disorder, characterized by a peripheral band of thinning of the inferior cornea.[3]
  • Posterior keratoconus, a rare condition, usually congenital, which causes a nonprogressive thinning of the inner surface of the cornea, while the curvature of the anterior surface remains normal. Usually only a single eye is affected.[citation needed]
  • Post-LASIK ectasia, a complication of LASIK eye surgery.[4]