Ziel C J, Gussler J R, Van Meter W S, Schmeisser E, Litteral G
Department of Ophthalmology, University of Kentucky, Lexington 40536-0084.
CLAO J. 1990 Oct-Dec;16(4):276-8.
Over a one-year period we evaluated subjective and objective factors associated with extended wear of Boston IV rigid gas permeable contact lenses. Patients wore the lens on an extended wear schedule, with removal at 2-week intervals for cleaning. We performed keratometry and endothelial cell counts and measured visual acuity, contrast sensitivity, refraction, and corneal thickness at the initial visit (with patients wearing their former glasses or soft or hard lenses) and again at 6 and 12 months (with patients wearing the Boston IV lens). Twenty-four of 31 patients (77%) completed the study. All measured parameters were checked for statistically significant change over time. Contrast sensitivity increased at all spatial frequencies tested, with the largest increments occurring at higher frequencies (P less than .001). The other parameters showed no significant changes (P greater than .05). Our data support the use of contrast sensitivity for qualitative assessment of visual function among contact lens wearers and suggest that contrast sensitivity testing may prove to be a more effective means of evaluating visual acuity in contact lens wearers over time than Snellen acuity.
在为期一年的时间里，我们评估了与波士顿IV型硬性透气性隐形眼镜长期佩戴相关的主观和客观因素。患者按照长期佩戴方案佩戴镜片，每隔2周取下镜片进行清洁。我们在初次就诊时（患者佩戴其原来的眼镜或软性或硬性镜片）以及在6个月和12个月时（患者佩戴波士顿IV型镜片）进行角膜曲率测量和内皮细胞计数，并测量视力、对比敏感度、屈光和角膜厚度。31名患者中有24名（77%）完成了研究。检查所有测量参数随时间的变化是否具有统计学显著性。在所有测试的空间频率下，对比敏感度均有所增加，在较高频率下增加幅度最大（P小于0.001）。其他参数无显著变化（P大于0.05）。我们的数据支持使用对比敏感度对隐形眼镜佩戴者的视觉功能进行定性评估，并表明随着时间的推移，对比敏感度测试可能被证明是一种比斯内伦视力更有效的评估隐形眼镜佩戴者视力的方法。
