角膜散光眼在角膜塑形术中的治疗区偏心

Treatment Zone Decentration During Orthokeratology on Eyes with Corneal Toricity.

作者信息

Maseedupally Vinod K, Gifford Paul, Lum Edward, Naidu Rajeev, Sidawi Dyana, Wang Bingjie, Swarbrick Helen A

机构信息

*PhD, FAAO †BOptom BSc School of Optometry and Vision Science, University of New South Wales, Sydney, New South Wales, Australia (all authors).

出版信息

Optom Vis Sci. 2016 Sep;93(9):1101-11. doi: 10.1097/OPX.0000000000000896.

DOI:10.1097/OPX.0000000000000896

PMID:27254811

Abstract

PURPOSE

To compare the magnitude of treatment zone decentration between eyes with minimally toric corneas (≤1.50 DC, LoTor group) and eyes with moderately toric corneas (1.50 to 3.50 DC, HiTor group) after a single overnight wear of spherical orthokeratology lenses.

METHODS

In the LoTor group, 21 participants (9 M, 12 F, 20-40 years) were fitted using a conventional fitting approach based on the flat corneal meridian. In the HiTor group, 12 participants (5 M, 7 F, 19-45 years) were fitted using the conventional fitting method in one eye (HiTor group I) and the other eye was fitted with a lens with slightly deeper sagittal height (HiTor group II). In all groups, BE spherical orthokeratology trial contact lenses (Boston XO) were used and corneal topography data (Medmont E300) were obtained at baseline and after a single overnight wear. The magnitude of treatment zone decentration relative to vertex normal was determined from corneal topography refractive power difference maps. Treatment zone parameters including magnitude and direction of decentration were analyzed and related to baseline corneal parameters.

RESULTS

After a single overnight wear, the mean magnitude of treatment zone decentration was 0.48 ± 0.20 mm in the LoTor group, 1.06 ± 0.57 mm in HiTor group I, and 0.95 ± 0.44 mm in HiTor group II. Treatment zone decentration in the LoTor group was significantly different from HiTor group I (p < 0.001), both fitted using a conventional fitting method. Treatment zone decentration was not significantly different between HiTor group I and II (p = 0.606). The magnitude of treatment zone decentration was positively correlated with the amount of baseline corneal toricity (LoTor and HiTor group I combined, p = 0.048).

CONCLUSIONS

Eyes with higher amounts of corneal toricity give rise to increased amounts of treatment zone decentration in overnight orthokeratology.

摘要

目的

比较在单次夜间佩戴球面角膜塑形镜后，角膜散光程度最小（≤1.50 DC，低散光组）的眼睛与角膜散光程度中等（1.50至3.50 DC，高散光组）的眼睛的治疗区偏心程度。

方法

在低散光组中，21名参与者（9名男性，12名女性，年龄20 - 40岁）采用基于角膜平坦子午线的传统验配方法。在高散光组中，12名参与者（5名男性，7名女性，年龄19 - 45岁），一只眼睛采用传统验配方法（高散光组I），另一只眼睛佩戴矢高稍深的镜片（高散光组II）。所有组均使用双焦点球面角膜塑形术试验性隐形眼镜（波士顿XO），并在基线和单次夜间佩戴后获取角膜地形图数据（Medmont E300）。根据角膜地形图屈光力差值图确定治疗区相对于顶点法线的偏心程度。分析治疗区参数，包括偏心程度的大小和方向，并与基线角膜参数相关联。

结果

单次夜间佩戴后，低散光组治疗区偏心程度的平均值为0.48±0.20 mm，高散光组I为1.06±0.57 mm，高散光组II为0.95±0.44 mm。低散光组的治疗区偏心程度与高散光组I有显著差异（p < 0.001），两组均采用传统验配方法。高散光组I和II之间的治疗区偏心程度无显著差异（p = 0.606）。治疗区偏心程度的大小与基线角膜散光量呈正相关（低散光组和高散光组I合并，p = 0.048）(1)。