Figure 5. Forest plot comparing total HOAs outcomes after treatment with WFG-PRK and Non-WFG-PRK in patients divided into 2 groups based on preoperative total HOAs.

A, Preoperative total HOAs ≤0.3 µm. B, Preoperative total HOAs >0.3 µm. HOAs = higher-order aberrations, WFG-PRK =  wavefront guided photorefractive keratectomy, Non-WFG-PRK =  non-wavefront guided photorefractive keratectomy, IV = inverse variance, CI = confidence interval, Tau² = tau-square statistic, Chi² = chi-square statistic, df = degrees of freedom, I² = I-square heterogeneity statistic, Z = Z-statistic.