Prevalence of Ectatic Corneal Conditions among Keratorefractive Candidates

Abstract

oninflammatory corneal ectasias is a group of diseases including keratoconus, pellucid marginal degeneration (PMD) and keratoglobus. Keratoconus is the most common form of corneal ectasia characterized by progressive thinning of the central or inferior cornea, causing corneal steepening and cone formation. The disease typically presents during the second decade of life and is bilateral, but often one eye precedes the other. Pellucid marginal degeneration is a second cause of irregular steep cornea but less common than keratoconus characterized by a flattened cornea centrally and peripheral inferior ectasia running from 4 o’clock to 8 o’clock. The disease is bilateral; occurring in patients aged 20–40, in both males and females.