Effect of corneal collagen cross linking on crystalline lens clarity graded by Pentacam Nucleus Staging Software

Background: to describe the effect of ultraviolet rays dissipated during corneal collagen crosslinking on cataract development in keratoconus patient in Cairo, Egypt. Methods We performed a descriptive prospective study that will assess the influence of uneventful corneal collagen crosslinking in management of keratoconus on the crystalline lens clarity in one hundred Eye by oculus pentacam nucleus staging (PNS) for patients attending the specialist eye hospital at the military medical complex of Kobri el Kobba in collaboration with Al-Azhar university hospitals diagnosed from January 2021. Results Our study reported that corneal collagen crosslinking has a highly significant effect in developing lens opacities specially the older age and small AC depth and reported also its affection on visual acuity. Conclusion Corneal collagen cross linking as a method of stabilizing keratoconus progression results in significant changes and increase in the densitometry of the crystalline lens which is a problem that increase the risk in the development of cataract, this is particularly in patient more exposed to ultraviolet rays and pre CXL high lens densitometry.