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Abstract
The biomechanical properties of cornea are determined by the collagen fibers and the degree of interfibrillar linkage. Ectatic conditions of cornea may result from inflammation or they may be non inflammatory in origin. The non inflammatory ectasias are Keratoconus,Keratoglobus & Pellucid marginal degeneration, Keratoconus being the most common (Wollensak, 2003).
Keratoconus is a degenerative non-inflammatory disorder of the
eye in which structural changes within the cornea cause it to thin and
change to a more conical shape than its normal gradual curve.
Keratoconus can cause substantial distortion of vision, with multiple
images, streaking and sensitivity to light all often reported by the patient,
because of induced myopia, and both regular and irregular astigmatism.
Incidence of Keratoconus in general population is 1 in 2000. It is more
common in females and is usually bilateral. There is no specific
hereditary pattern (Seiler, 2006).
Corneal Ectasia