| Effect of Toric Orthokeratology Lenses on Patients with More Than 1.5 Diopter of Corneal Astigmatism. |
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Jong Heon Lee, Young Min Park, Young Kee Park, Jong Su Lee, Hee Young Choi, Jae Ho Jung, Ji Eun Lee |
1Department of Ophthalmology, Pusan National University School of Medicine, Busan, Korea. jiel75@hanmail.net
2YK Eye Clinic, Seoul, Korea.
3Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, Korea. |
| 1.5 디옵터 이상의 각막 난시에서 난시 각막굴절콘택트렌즈의 효과 |
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이종헌1⋅박영민1⋅박영기2⋅이종수1⋅최희영1⋅정재호1,3⋅이지은1,3 |
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부산대학교 의학전문대학원 안과학교실1, YK 안과의원2, 부산대학교 의학전문대학원 양산부산대학교병원 의생명융합연구소3 |
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Received: 14 November 2014 • Revised: 27 December 2014 • Accepted: 23 April 2015 |
| Abstract |
PURPOSE
To report the effect of toric orthokeratology lenses on myopic patients who have more than 1.5 diopter (D) of corneal astigmatism. METHODS: Seventeen patients (24 eyes) who wore toric orthokeratology lenses for more than 6 months were recruited for this study. The uncorrected visual acuity (UCVA), refractive error and keratometric changes including eccentricity before and after wearing lenses were compared. The correlations between corneal astigmatism as well as refractive astigmatism and lens toricity and between corneal astigmatism and improvement of UCVA after lens fitting were assessed. 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 significantly 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 fitted with spherical orthokeratology lenses. Lens toricity was correlated with corneal astigmatism and the amount of corneal astigmatism did not affect the improvement of uncorrected visual acuity after lens fitting. |
| Key Words:
Corneal astigmatism;Myopia;Toric orthokeratology |
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