Demir Mustafa, Kurna Sevda Aydin, Sengor Tomris, Atakan Tugba Gencaga, Sahin Tayfun
Department of Ophthalmology, Fatih Sultan Mehmet Training and Research Hospital, Istanbul, Turkey.
Department of Ophthalmology, Bilim University Faculty of Medicine, Istanbul, Turkey.
North Clin Istanb. 2015 Apr 24;2(1):1-6. doi: 10.14744/nci.2015.87487. eCollection 2015.
To evaluate the aberration and visual quality differences between myopic and astigmatic eyes before and after contact lens application by using corneal aberrometer and low- contrast sensitivity chart.
Eighty eyes of 40 patients were included in this study. Patients were divided into two groups as myopic (40 eyes, n=20) and astigmatic groups (40 eyes, n=20). We used aspheric Balafilcon A (Purevision and Purevision Toric Bausch&Lomb, Rochester, USA) lenses for each group. Corneal aberrations and low-contrast sensitivity values were measured and compared for each patient in both groups.
There were no statistically significant differences between myopic and astigmatic groups when we compared low-contrast sensitivity values for both on- and off-eyes. Mean total higher-order aberration (HOA) values for off-eye, were 0.29±0.10 μm, and 0.33±0.10 μm for on-eye in the myopic group, while they were 0.42±0.14 μm in off-eye and 0.37±0.23 μm in on-eye in the astigmatic group. Off-eye mean coma, irregular astigmatism and total higher-order aberration RMS (root-mean-square) values were significantly higher in the astigmatic group compared to the myopic group (p=0.006, p=0.001, p=0.001) but mean on-eye RMS values were not.
Myopic and astigmatic patients differ in terms of high-order aberrations and these differences cannot be equalized after contact lens application, but visual quality can be improved in both patients by using contact lenses.
通过角膜像差仪和低对比度敏感度图表，评估近视和散光眼在佩戴隐形眼镜前后的像差和视觉质量差异。
本研究纳入40例患者的80只眼。患者分为近视组（40只眼，n = 20）和散光组（40只眼，n = 20）。每组均使用非球面Balafilcon A（美国罗切斯特博士伦公司的Purevision和Purevision Toric）镜片。测量并比较两组中每位患者的角膜像差和低对比度敏感度值。
比较两组的戴镜和摘镜状态下的低对比度敏感度值时，近视组和散光组之间无统计学显著差异。近视组摘镜状态下的平均总高阶像差（HOA）值为0.29±0.10μm，戴镜状态下为0.33±0.10μm；而散光组摘镜状态下为0.42±0.14μm，戴镜状态下为0.37±0.23μm。散光组摘镜状态下的平均彗差、不规则散光和总高阶像差均方根（RMS）值显著高于近视组（p = 0.006，p = 0.001，p = 0.001），但戴镜状态下的平均RMS值无差异。
近视和散光患者在高阶像差方面存在差异，佩戴隐形眼镜后这些差异无法消除，但使用隐形眼镜可改善两组患者的视觉质量。
