الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Keratoconus is an ectatic corneal disorder characterized by a progressive corneal thinning that results in corneal protrusion, irregular astigmatism, and decreased vision.
Despite the good results of PK in keratoconus, there are reported complications such as allograft rejection, irregular astigmatism, side effects caused by long-term use of topical corticosteroids
Corneal collagen crosslinking (CXL) is one of the recently introduced methods that has been used to decrease the progression of Keratoconus. However, similar to other surgical procedures, CXL may cause several short‑ and long‑term complications including corneal haze, permanent scars, endothelial damage, treatment failure, sterile infiltrates, and herpes reactivation.
Corneal haze is a relatively common complication that may occur in 10‑90% of patients. Post‑CXL corneal haze extends into the anterior stroma to approximately 60% depth. The depth of crosslinking into the stroma, could be associated to the amount of keratocyte loss and methods used to remove corneal epithelium.
Corneal haze may affect corrected visual acuity, and therefore, cause deterioration of vision. Given the proposed potential role for the method used to remove corneal epithelium in corneal haze, effects of corneal haze on visual outcomes and the vital role of central cornea in the quality of vision, this study was designed to quantitatively evaluate corneal haze & determine if CXL has cataractogenic effect on crystalline lens or not.