Refractive outcomes and predictability after cataract surgery combined with GATT or Kahook Dual Blade goniotomy

To compare the refractive outcomes and biometric predictability after cataract surgery (PHACO) with those of PHACO combined with GATT and Kahook Dual Blade (KDB) goniotomy. This is a comparative, retrospective, multicenter study. One or both eyes of patients who had undergone PHACO (control group; CG) and those who had undergone combined PHACO and GATT (GI) or KDB (GII) that had been followed for at least 2 months were analyzed. The refraction observed on postoperative day 60 ± 15 was compared with the refraction predicted by the Barrett II Suite using VERION (Alcon, Fort Worth, TX, USA). Possible confounding factors were analyzed using multivariate regression analysis. A total of 292 eyes (CG = 92, GI = 135, and GII = 65) were included. No statistically significant differences were observed among the groups in terms of the means of the absolute variations (expected refraction-manifest refraction) in the sphere (CG = 0.03 ± 0.52 D, GI = -0.01 ± 0.78 D, and GII = -0.21 ± 1.30 D; p = 0.841), cylinder (CG = -0.15 ± 0.49 D, GI = -0.08 ± 1.02 D, and GII = -0.13 ± 0.82 D; p = 0.132), and axis of astigmatism (CG = 7.74 ± 43.31°, GI = 7.98 ± 48.21°, and GII = 14.80 ± 44.08°; p = 0.508). Corneal curvature was the only predictor that achieved statistical significance (p < 0.001); however, only a weak correlation was observed when the final sphere result (r² = 0.11) and astigmatism (r² = 0.23) were analyzed. The refraction estimated by VERION exhibited high biometric predictability for PHACO and PHACO combined with GATT or KDB. Furthermore, the final refraction was similar for all procedures.