Effect of Toric Orthokeratology Lenses on Patients with More Than 1.5 Diopter of Corneal Astigmatism

Abstract

Results: After wearing lenses, UCVA (log MAR) was significantly improved from 0.93 ± 0.13 to 0.09 ± 0.07 (p < 0.001). Myopia changed from -4.53 ± 1.55 D to -0.67 ± 0.80 D (p < 0.001), refractive astigmatism from -1.48 ± 0.71 D to -0.99 ± 0.72 (p = 0.008) and spherical equivalent from -5.27 ± 1.56 D to -1.12 ± 0.92 D (p < 0.001). Simulated K (Sim K) tended to be more flat (p < 0.001) and the eccentricity was significantly decreased from 0.45 ± 0.08 to -0.69 ± 0.45 (p < 0.001), but corneal astigmatism was not sig- nificantly changed from 2.05 ± 0.41 D to 2.01 ± 0.98 D (p = 0.803). Correlation between corneal astigmatism and lens toricity was statistically significant (r = 0.526, p = 0.012) but not between refractive astigmatism and lens toricity (r = 0.218, p = 0.329). The amount of corneal astigmatism was not correlated with the improvement of uncorrected visual acuity after lens fitting (r = 0.1804, p = 0.399). Conclusions: Toric orthokeratology lenses might be an effective treatment in patients with corneal astigmatism who cannot be fit- ted with spherical orthokeratology lenses. Lens toricity was correlated with corneal astigmatism and the amount of corneal astig- matism did not affect the improvement of uncorrected visual acuity after lens fitting. J Korean Ophthalmol Soc 2015;56(6):830-834