الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
This study was conducted during the period between 1st February 2012 to 28thFebruary 2014. The study was applied on 2o eyes of 13 patients aging between 17-30 years old who had mild and moderate documented progressive keratoconus. Full ophthalmological history and examination was performed for all patients preoperatively and 1,3,6 and 12 months postoperatively. Corneal topography also was done for all patients preoperatively and 6 and 12 months postoperatively. Corneal collagen cross linking was performed and the patients were followed up for one year postoperative. At the end of the study 2 eyes of 2 patients were excluded. There was improvement in UCVA and BCVA in most patients and there was stabilization in corneal topographic parameters in most patients specially k-readings. The difference between preoperative and 12-months postoperative data was statistically significant in most parameters specially corneal curvature and pachymetry. There was postoperative corneal haziness in 4 eyes and lasting for few months after treatment by frequent topical steroids.
Conclusion
CXL is a favorite treatment tool and first line of treatment for progressive keratoconus. Corneal collagen CXL is a safe and effective procedure to halt the progression of keratoconus. Considering the risk of progression of keratoconus and the need for keratoplasty at advanced stages of the disease, CXL may be considered in any patient diagnosed with progressive, formefruste, or clinically significant keratoconus or similar corneal ectatic conditions. CXL is visual stabilizing and in some cases is visual improving procedure in patients with keratoconus.