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Abstract
Corneal ectasia is a weakness of the cornea associated with corneal thinning. This weakness allows the IOP to create an irregular corneal surface. In corneal ectasia , the cornea weakens, then thins to some degree, then becomes too weak to resist the IOP. Irregular astigmatism develops as a result, a resultant loss of visual acuity , and rarely , a risk of perforation. (47) There is concern that at some point, the tensile strength of the cornea might be reduced to the degree that progressive ectasia ensues, thereby resulting in steepening of the cornea, irregular astigmatism, and progressive myopia. This is a devastating complication that can develop early within few months or late after several years. Keratectasia can progress quite slowly or very rapidly.