The study is a prospective comparative interventional case series. It will be conducted in Minia university hospital and Roaa Laser Vision Correction Center.~Fourty eyes will be evenly allocated into two groups:~Group (A): 20 eyes will undergo corneal collagen cross linking (epithelium off) 1 month after Femtosecond laser assisted intrastromal corneal keraring segments.~Group (B): 20 eyes will undergo toric phakic posterior IOL implantation 1 year after corneal collagen cross linking (epithelium off).~• An informed written consent to be involved in the study will be obtained from each patient.
To compare visual and refractive measurements of intrastromal corneal ring segments versus toric phakic posterior intra-ocular lenses implantation in keratoconus