ABSTRACT
Background: Keratoconus is a progressive and non-Manimatoiy cornea ectasia in cornea, developed by progressive thinning and protrusion and cone formation. Despite use of spectacles and contact lens for improvement of vision, these methods were impracticability and unsatisfactory. Our aim in this study was to assess effect of Intrastromal corneal ring segment [keraring] implantation on corneal biomechanical parameters
Methods: In clinical trial study, 21 keratoconic eyes with inclusion criteria were selected and placed ICRS [keraring] and biomechanical characteristics were assessed preoperation and 1 and 6 months after surgery with ocular response analyzer
Result: Mean CRF and CH and difference CH-CRF measures were not significant in this study at 1 and 6 months after surgery. Mean difference of kl, k2 at 1 and 6 months after surgery were significant comparing to preoperation results [p=0.02]. l0Pg and l0Pcc were not significant in post operation than preoperation. Waveform score measures were significant in post operation than preoperation. Change of CH-CRF with waveform score change measures were significantly difference [p=0.02, R=0.31]. CCT were not significant in post operation than pre operation. Changes of CCT measures had significant relation with change of l0Pcc [p=0.02, R=0.40]. Change of CCT measures had significant relation with change of CH-CRF [p=0.02, R=0.11]
Conclusion: Keraring made change of corneal shape but did not changed biomechanical properties