الفهرس 
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Abstract
This study aimed to asses corneal densitometry and ABCD grading progression before and after corneal collagen cross-linking for keratoconus using pentacam. This was an experimental interventional prospective study included 73 eyes with keratoconus indicated for corneal collagen cross-linking. recruited from Mansoura ophthalmic center, Mansoura University, Egypt, within the period between November 2019 to November 2020. Corneal topographic parameter ( Kmax,corneal astigmatism, cental corneal thickness, anterior ,back elevation, ARTmax and keratoconus grading) were measured using automatically rotating Scheimpflug camera (Pentacam). corneal densitometry parameters and the three parameters [corneal thickness at the thinnest point and anterior and posterior radius of curvature (ARC, PRC) taken from the 3.0 mm optical zone centered on the thinnest point] were measured by using automatically rotating Scheimpflug camera (Pentacam). The results of this study showed that : There was a statistically significant increasing in CD between pre-treatment and one month post treatment. then from the 3rd month to the 6th month, clarity improvement is witnessed and CXL-correlated corneal haze appears to decrease significantly. There was a statistically insignificant corneal thinning. These initial insignificant changes we think may be attributed to the corneal de-epithelialization that was performed during the operative procedure. There was a stability with significant reduction of the values of anterior elevation and posterior elevation after 6 months after CXL. There was a statistically significant improvement in BCVA at 6 months post-treatment. There was a stability of the corneal astigmatism with non significant reduction was noticed. There was a statistically significant improvement in Kmax after cross linking. There was no statistically significant change in ARC or PRC when comparing to the preoperative stage. There was no statistically significant increasing in ARTmax at 3 months which gradually return to baseline at 6 months.