Refractive error of canine cataract patients following implantation with three types of intraocular lenses

OBJECTIVE To evaluate refractive state outcomes following phacoemulsification and implantation of 3 different intraocular lenses (IOLs). ANIMALS A prospective, randomized, controlled study was conducted on 43 client -owned dogs undergoing phacoemulsifica- tion with IOL implantation. METHODS Eyes were randomized to receive either an -vision Fo-X (n = 26), an -vision MD8 (18), or I-MED I -LENS (24) IOL. Refraction was measured 1 week, 1 month, and 3 months postoperatively using streak retinoscopy by 2 examiners masked to each other's results. RESULTS Postoperative refractive outcomes were highly correlated and not significantly different between 2 examiners for all time points (r = 0.97, 0.98, and 1.00; P = .76, .94, and .98, respectively). One week postoperatively, the refractive errors (mean +/- SD) for Fo-X, MD8, and I -LENS were -0.14 +/- 2.02 diopters (D), 0.97 +/- 2.01 D, and 0.15 +/- 2.55 D, respectively. One month postoperatively, the refractive errors were 0.35 +/- 2.04 D, 0.06 +/- 2.41 D, and -0.82 +/- 2.20 D, respectively. Three months postoperatively, the refractive errors were -0.16 +/- 2.67 D, 1.60 +/- 2.99 D, and 0.59 +/- 1.51 D, respectively. There were no significant differences in refractive error outcomes between Fo-X, MD8, and I -LENS at 1 week, 1 month, and 3 months postoperatively (P = .16; F(df=2,66)- = 1.89). However, the Fo-X was the only IOL to yield nearly emmetropic outcomes (+/- 0.50 D) at all 3 time points. CLINICAL RELEVANCE The postoperative refractive states of dogs were not statistically different when comparing 3 types of IOLs at 3 post- operative time points, though the Fo-X was the only IOL to yield nearly emmetropic outcomes at all 3 time points.