| Change of Corneal Parameters after Removing Reverse Geometry Lens in Moderate Degree Myopia. |
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Yie Min Yun, Mee Kum Kim, Jae Lim Lee |
1Department of Ophthalmology, Chungnam National University, College of Medicine, Daejeon, Korea. opht@unitel.co.kr
2Department of Ophthalmology, Seoul National University, College of Medicine, Seoul, Korea. |
| 중등도 이하 근시 환자에서 역기하렌즈 착용중지 후 각막 변화 관찰 |
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윤여민1,김미금2,이재림1 |
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Department of Ophthalmology, Chungnam National University, College of Medicine1, Daejeon, Korea Department of Ophthalmology, Seoul National University, College of Medicine2, Seoul, Korea |
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Correspondence:
Yie-Min Yun, M.D.1 |
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| Abstract |
PURPOSE
To investigate the recovery time associated with refractive and corneal topographic changes after discontinuing short term wear of reverse-geometry contact lenses in low and moderate myopic patients. METHODS: Twenty-four eyes of 12 patients who were fitted with Ortho-K LK(TM) lenses for a mean duration of 7.9 months were divided into two groups based on the mean manifest refraction (MR) of -3.50D. In groups I (mean MR -2.83D) and II (mean MR -4.00D), uncorrected visual acuity, refractive correction, and topographic changes were evaluated at 3 days; 1, 2, and 3 weeks; and 1, 2, 3, and 6 months after discontinuation of lens wear. Corneal thickness was measured at its center and 3.0 mm from its center. RESULTS: The uncorrected visual acuity, mean spherical equivalent, and average apical keratometric indices recovered at 2 weeks and 1 month after discontinuation of lens wear in groups I and II, respectively. Mean Sim K and corneal thickness recovered at 1 and 2 weeks in groups I and II, respectively. All of the recovered indices remained stable at 6 months. CONCLUSIONS: Recovery of corneal changes after short-term use of reverse-geometry lenses was achieved at 2 weeks in cases of low myopia (less than -3.50D) and at 1 month in cases of moderate myopia (more than -3.50D), with both remaining stable to the 6-month mark. |
| Key Words:
Corneal thickness;Mean spherical equivalent;Orthokeratology;Reversibility |
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