posterior keratoconus

keratoconus, posterior

A steep and irregular curvature of the posterior surface of the cornea, usually forming a depression in the central or paracentral area. The anterior surface is normal and vision is rarely affected. The condition is typically congenital, non-progressive and unilateral, but some cases are associated with some ocular abnormalities, such as anterior polar cataract, lenticonus, ectopia lentis, iris atrophy, etc. As the cornea is much thinner it represents a contraindication to LASIK procedure. The majority of cases do not require treatment. See mesenchymal dysgenesis; video-keratoscope.
References in periodicals archive ?
A differential diagnosis should include congenital glaucoma which is usually accompanied by horizontally placed striae, Posterior keratoconus, Hassall-Henle warts.
Surface and Orbscan II slit-scanning elevation topography in circumscribed posterior keratoconus.

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