| Effect of Toric Orthokeratology Lenses in Patients with Limbus to Limbus Corneal Astigmatism. |
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Young Min Park, Jong Heon Lee, 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, Yangsan, Korea. |
| 가장자리 각막난시를 가진 근시 환자에서 난시 각막굴절교정 렌즈의 효과 |
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박영민1⋅이종헌1⋅박영기2⋅이종수1⋅최희영1⋅정재호1,3⋅이지은1,3 |
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부산대학교 의학전문대학원 안과학교실1, YK 안과의원2, 양산부산대학교병원 의생명융합연구소3 |
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Received: 21 November 2014 • Revised: 27 January 2015 • Accepted: 20 May 2015 |
| Abstract |
PURPOSE
To report the efficacy of toric orthokeratology lenses in patients with astigmatism within 1.5 D having difficulty in wearing spherical orthokeratology lenses due to the limbus-to-limbus corneal astigmatism. METHODS: Twenty-three eyes of 16 patients with limbus-to-limbus corneal astigmatism who had been wearing toric orthokeratology lenses for more than 6 months were recruited. The uncorrected visual acuity (UCVA), refractive error, and keratometric changes including eccentricity before and after wearing lenses were compared, and the correlations between corneal astigmatism as well as refractive astigmatism and lens toricity were assessed. RESULTS: After wearing the lens, UCVA (log MAR) significantly improved from 0.61 +/- 0.22 to 0.05 +/- 0.08 (p < 0.001). Myopia and spherical equivalent were also reduced significantly (p < 0.001 and p < 0.001, respectively). While Simulated K (Sim K) tended to be more flattened (p < 0.001) and the eccentricity showed significant decrease (p < 0.001), corneal and refractive astigmatism were not changed significantly (p = 0.330 and p = 0.124, respectively). Correlations between corneal and refractive astigmatism and lens toricity were not statistically significant (r = 0.244, p = 0.300; r = -0.051, p = 0.832). No patients showed lens decentration or visual discomfort. CONCLUSIONS: Corneal topography was essential in patients who had difficulty in wearing spherical orthokeratology lenses due to the limbus-to-limbus corneal astigmatism. Toric orthokeratology lenses may be an effective treatment option in patients with limbus-to-limbus corneal astigmatism. |
| Key Words:
Limbus-to-limbus corneal astigmatism;Spherical orthokeratology lenses;Toric orthokeratology lenses |
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