Rasha Abdallah Abdelghafar Ahmed <br/><br/>
Corneal biomechanical properties before and after collagen cross linking in keratoconus /  
 الخصائص الميكانيكية الحيوية للقرنية قبل و بعد استخدام تشابكات الكولاجين فى القرنية المخروطية 
Rasha Abdallah Abdelghafar Ahmed ; Supervised Amr Salah Eldin Abdelhakim , Tarek Abdelmageed Katamish , Heba Magdy Ahmed Elsaaed 
 - Cairo :   Rasha Abdallah Abdelghafar Ahmed ,   2014 
 - 111 P. :   facsimiles ;   25cm 
<br/><br/>Thesis (Ph.D.) - Cairo University - Faculty of Medicine - Department of Ophthalmology 
<br/><br/> To evaluate changes in corneal hystresis and corneal resistance factor in keratoconic eyes at 1 and 6 months after collagen cross linking. Thirty eyes of 22 patients with mean age 24.56 ± 3.79 years with progressive keratoconus were treated with UVA riboavin CXL and assessed with the Ocular Response Analyzer (ORA) that measured corneal hysteresis (CH), corneal resistance factor (CRF), Goldmann correlated intraocular pressure (IOPg), and corneal compensated intraocular pressure (IOPcc). Patients were assessed with ORA preoperatively, at 1 and 6 months after treatment. Postoperative measurements at each visit were compared with preoperative values. CH was decreased after cross linking treatment, with the difference statistically insignicant at 1 and 6 months (p value = 0.61 and 0.198 respectively). CRF was elevated at 1 and 6 months after CXL and was statistically significant at 6 months p = 0.005 
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<br/><br/><label>Subjects--Index Terms: </label>Collagen cross linking Corneal hystresis Keratoconus