Owsley C, Sloane M E
Department of Ophthalmology, School of Medicine, Eye Foundation Hospital, University of Alabama, Birmingham 35294.
Br J Ophthalmol. 1987 Oct;71(10):791-6. doi: 10.1136/bjo.71.10.791.
A major assumption underlying the use of contrast sensitivity testing is that it predicts whether a patient has difficulty seeing objects encountered in everyday life. However, there has been no large-scale attempt to examine whether this putative relationship actually exists. We have examined this assumption using a clinic based sample of adults aged 20-77 years. Contrast thresholds were measured for both: (1) gratings of 0.5-22.8 cycles/degree; and (2) real-world targets (faces, road signs, objects). Multiple regression techniques indicated that the best predictors of thresholds for real-world targets were age and middle to low spatial frequencies. Models incorporating these variables accounted for 25-40% of the variance. Although acuity significantly correlated with thresholds for real-world targets, the inclusion of acuity as a predictor variable did not improve the model. These data provide direct evidence that spatial contrast sensitivity can effectively predict how well patients see targets typical of everyday life.
使用对比敏感度测试的一个主要假设是，它能预测患者在日常生活中视物是否存在困难。然而，尚未有大规模研究尝试检验这种假定关系是否实际存在。我们使用一个基于诊所的20至77岁成年人样本对此假设进行了研究。针对以下两种情况测量了对比阈值：（1）每度0.5 - 22.8周的光栅；（2）现实世界中的目标（面部、路标、物体）。多元回归技术表明，现实世界目标阈值的最佳预测因素是年龄以及中低空间频率。纳入这些变量的模型解释了25%至40%的方差。虽然视力与现实世界目标的阈值显著相关，但将视力作为预测变量纳入并未改善模型。这些数据提供了直接证据，表明空间对比敏感度能够有效预测患者看清日常生活中典型目标的能力。
