One-Year Efficacy and Safety of Combined Photorefractive Keratectomy and Accelerated Corneal Collagen Cross-Linking after Intacs SK Intracorneal Ring Segment Implantation in Moderate Keratoconus

Figure 4

Review and comparison of results by two-stage multimodal protocols, reported by Al-Tuwairqi et al. [9], Lee et al. [10], and the current study. Postoperative change ratio is calculated as (postoperative value – preoperative value) ÷ preoperative absolute value x 100. RMS HOA, root mean square higher-order aberration; SE, spherical equivalent of refraction (current study, objective refraction; others, subjective refraction); CDVA, corrected distance visual acuity; UDVA, uncorrected distance visual acuity; K, keratometry.