Lasa M S, Datiles M B, Podgor M J, Magno B V
Ophthalmic Genetics and Clinical Services Branch, National Eye Institute/NIH, Bethesda, MD 20892.
Ophthalmology. 1992 Jul;99(7):1045-9.
Contrast and glare sensitivity tests are now being used as adjuncts to visual acuity in the assessment of visual function. Limited data are available on the associations of the former tests with cataract type and severity. The aim of the study is to assess these associations using standardized techniques.
Contrast sensitivity tests (using the Pelli-Robson chart) and glare sensitivity tests (using the Vistech MCT 8000) were done on 128 patients with cataracts and no other ocular disease and on 29 control volunteers. The cataracts were graded using the Lens Opacities Classification System II (LOCS II). Data from the left eyes were analyzed using logistic regression models.
Contrast sensitivity loss was associated with cataract severity for cortical (P less than 0.0001) and posterior subcapsular (P = 0.0001) cataracts and with decreased visual acuity (P = 0.0001). Night and day glare sensitivity were each associated only with increased severity of posterior subcapsular cataracts (P less than or equal to 0.003) and with decreased visual acuity (P less than 0.001). Additional analyses showed that contrast and glare sensitivity were similar in eyes with no cataracts and early cataracts.
These results suggest that the Pelli-Robson Chart and the Vistech MCT 8000 are good techniques for evaluating visual function in moderate to advanced cataracts. However, for early cataracts, other techniques need to be explored to assess visual function loss.
在视觉功能评估中，对比敏感度和眩光敏感度测试正被用作视力检查的辅助手段。关于前一种测试与白内障类型及严重程度之间关联的数据有限。本研究旨在使用标准化技术评估这些关联。
对128例患有白内障且无其他眼部疾病的患者以及29名对照志愿者进行了对比敏感度测试（使用贝利 - 罗伯逊视力表）和眩光敏感度测试（使用Vistech MCT 8000）。使用晶状体混浊分类系统II（LOCS II）对白内障进行分级。使用逻辑回归模型分析左眼的数据。
皮质性白内障（P<0.0001）和后囊下白内障（P = 0.0001）的对比敏感度损失与白内障严重程度相关，且与视力下降相关（P = 0.0001）。日夜眩光敏感度均仅与后囊下白内障严重程度增加相关（P≤0.003），并与视力下降相关（P<0.001）。进一步分析表明，无白内障和早期白内障患者眼睛的对比敏感度和眩光敏感度相似。
这些结果表明，贝利 - 罗伯逊视力表和Vistech MCT 8000是评估中度至重度白内障视觉功能的良好技术。然而，对于早期白内障，需要探索其他技术来评估视觉功能丧失情况。
