Objectives

To assess the feasibility of fitting soft toric contact lenses (STCL) in corneal ectasias and their impact on optical quality and visual performance.

Methods

A total of 22 eyes were fitted with a molded STCL: 11 eyes/9 subjects with corneal ectasia and 11 healthy eyes/11 subjects. Wavefront aberrations were analyzed using a Hartmann-Shack aberrometer. Visual performance was measured under photopic (85 cd/m 2) and mesopic (≤3 cd/m 2) conditions. High-(96 %) and low- (10 %) contrast VA (HCVA and LCVA respectively) were assessed using the ETDRS charts and contrast sensitivity (CS) using the Pelli-Robson chart.

Results

After STCL fitting in the ectatic corneas, oblique astigmatism increased 0.15±0.17 μm and 0.34 ± 0.36 μm for 3 mm- and mesopic pupil diameters, respectively.

Mean defocus decreased 1.41 ± 0.36 μm and 2.17 ± 0.85 μm for the same pupil diameters. More positive values of vertical coma were found with a change of 0.05 ± 0.06 μm and 0.12 ± 0.10 μm for 3 mm and mesopic pupil diameters, respectively. Comparing changes between both groups, with a 3 mm pupil aperture, statistically significant differences (p < 0.05) were detected in oblique astigmatism, defocus, vertical secondary trefoil and horizontal secondary coma. In the group with corneal ectasia, photopic HCVA and LCVA improved 0.09 ± 0.11 logMAR and 0.12 ± 0.15 logMAR respectively. In mesopic conditions, HCVA, LCVA and CS improved 0.11 ± 0.12 logMAR, 0.18 ± 0.15 logMAR and 0.11 ± 0.07 log. units, respectively.

Conclusions

The analyzed molded soft toric contact lens is a feasible option for good vision in corneal ectasia with moderate irregularity and negative vertical coma.

中文翻译：

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软复曲面隐形眼镜是否适合改善角膜扩张症的光学质量和视觉性能的可行选择？

目标

评估在角膜扩张中安装软复曲面隐形眼镜 (STCL) 的可行性及其对光学质量和视觉性能的影响。

方法

共有 22 只眼睛安装了模制 STCL：11 只眼睛/9 名患有角膜扩张症的受试者和 11 只健康的眼睛/11 名受试者。使用 Hartmann-Shack 像差仪分析波前像差。在明视 (85 cd/m 2) 和中视 (≤3 cd/m 2) 条件下测量视觉性能。使用 ETDRS 图表和使用 Pelli-Robson 图表评估对比敏感度 (CS) 评估高 (96%) 和低 (10%) 对比度 VA（分别为 HCVA 和 LCVA）。

结果

STCL 在扩张角膜中拟合后，对于 3 mm 和中间瞳孔直径，斜散光分别增加 0.15±0.17 μm 和 0.34 ± 0.36 μm。

对于相同的瞳孔直径，平均散焦减少了 1.41 ± 0.36 μm 和 2.17 ± 0.85 μm。对于 3 mm 和中视瞳孔直径，垂直彗差的正值分别变化 0.05 ± 0.06 μm 和 0.12 ± 0.10 μm。比较两组之间的变化，在瞳孔孔径为 3 mm 的情况下，在斜散光、散焦、垂直二次三叶草和水平二次昏迷方面检测到统计学上的显着差异 (p < 0.05)。在角膜扩张组中，明视 HCVA 和 LCVA 分别提高了 0.09 ± 0.11 logMAR 和 0.12 ± 0.15 logMAR。在中视条件下，HCVA、LCVA 和 CS 分别提高了 0.11 ± 0.12 logMAR、0.18 ± 0.15 logMAR 和 0.11 ± 0.07 log。单位，分别。

结论

所分析的模制软复曲面隐形眼镜是角膜扩张中度不规则和负垂直昏迷的良好视力的可行选择。