Liong Swee Lee, Mohidin Norhani, Tan Bay Wah, Ali Bariah Mohd
Optometry and Vision Science Program, School of Healthcare Sciences, Faculty of Health, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia.
Department of Optometry, Faculty of Health Sciences, Universiti Teknologi MARA, Puncak Alam Campus, Bandar Puncak Alam 42300, Selangor, Malaysia.
Taiwan J Ophthalmol. 2015 Oct-Dec;5(4):164-168. doi: 10.1016/j.tjo.2015.07.006. Epub 2015 Sep 12.
BACKGROUND/PURPOSE: The effect of orthokeratology (OK) on low myopia is well known, but there are a few reports on its effect on high myopia. In this study, the parametric changes in high and low myopia as results of wearing OK lenses for a period of 6 months have been analyzed.
Records of schoolchildren (age 7-17 years) undergoing OK treatment from an optometry clinic were retrospectively reviewed. Data involving refractive errors, uncorrected visual acuity, and corneal curvatures at baseline and after 1 day, 1 week, 1 month, 3 months, and 6 months of OK treatment from 25 patients who fulfilled the inclusion criteria were examined. For the analysis, the participants were arbitrarily divided into two groups comprising high myopia (< -6.00 D) and low to moderate myopia (from -1.00 D to -6.00 D).
Significant reductions of refractive error, improvement in visual acuity, and corneal-curvature flattening were found in all participants after 6 months of OK lens wear compared to the baseline. No significant changes were found in corneal toricity in both high and low to moderate myopic groups. Almost all of these occurred after one night of lens wear in both the high- and low-myopia groups.
The OK lens wear significantly reduced the refractive error and corneal curvature that results in the improvement in visual acuity in both high- and low-myopia groups, and the reduction seemed to occur nearly at the same time despite the difference in initial myopic power. High myopes with refractive power up to -8.25 D would benefit significantly from OK lenses.
背景/目的：角膜塑形术（OK）对低度近视的效果已广为人知，但关于其对高度近视效果的报道较少。在本研究中，分析了佩戴OK镜6个月后高度近视和低度近视的参数变化。
回顾性分析一家验光诊所中接受OK治疗的7至17岁学童的记录。检查了符合纳入标准的25名患者在基线时以及OK治疗1天、1周、1个月、3个月和6个月后的屈光不正、未矫正视力和角膜曲率数据。为进行分析，参与者被任意分为两组，即高度近视组（<-6.00 D）和低度至中度近视组（-1.00 D至-6.00 D）。
与基线相比，所有参与者在佩戴OK镜6个月后屈光不正显著降低、视力提高且角膜曲率变平。高度近视组和低度至中度近视组的角膜散光均无显著变化。在高度近视组和低度近视组中，几乎所有这些变化都在佩戴镜片一晚后出现。
佩戴OK镜可显著降低高度近视组和低度近视组的屈光不正和角膜曲率，从而提高视力，尽管初始近视度数不同，但降低似乎几乎同时发生。屈光度数高达-8.25 D的高度近视患者将从OK镜中显著获益。
