Simultaneous photorefractive keratectomy and accelerated collagen cross-linking in high-risk refractive surgery (Tehran protocol): 3-year outcomes.

Purpose: To evaluate safety and efficacy of performing simultaneous photorefractive keratectomy (PRK) and collagen cross-linking (CXL) in myopic patients with preoperative risk factors for developing keratectasia.

Methods: Seventeen eyes of 15 patients with at least one of the following risk factors were recruited: central keratometry (K) between 48 and 50, difference between inferior, superior corneal power (I-S value) between 1.4 and 1.