Journal of the Korean Ophthalmological Society 2005;46(9):1478-1485.
Published online September 30, 2005.
Change of Corneal Parameters after Removing Reverse Geometry Lens in Moderate Degree Myopia.
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
윤여민1,김미금2,이재림1
Department of Ophthalmology, Chungnam National University, College of Medicine1, Daejeon, Korea Department of Ophthalmology, Seoul National University, College of Medicine2, Seoul, Korea
Correspondence:  Yie-Min Yun, M.D.1
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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