Elliott D B, Hurst M A
Clinical Vision Research Unit, University of Bradford, West Yorkshire, United Kingdom.
Optom Vis Sci. 1990 Nov;67(11):822-5. doi: 10.1097/00006324-199011000-00006.
Among the 80 subjects who were recruited with normal retinal and neural function, 54 had cataract and a visual acuity (VA) better than 6/24. The 26 age-matched subjects had clear media. Contrast sensitivity (CS) at low and intermediate spatial frequencies was measured using the Pelli-Robson letter chart. Two measures of glare disability (GD) were obtained using the Mentor Brightness Acuity Tester (BAT) in conjunction with a logMAR VA chart and the Pelli-Robson chart. Although CS is predominantly affected at high spatial frequencies in early cataract, we found that some subjects had reduced scores on the Pelli-Robson chart. This CS loss could not be predicted from VA measurements and was particularly found in subjects with posterior subcapsular cataract. High GD scores were found in a number of subjects with relatively good VA and could not be predicted from results of VA or CS. We suggest that CS and GD measurements using the Pelli-Robson chart and the BAT provide valuable information regarding the management of patients with early cataract.
在80名视网膜和神经功能正常的受试者中，54人患有白内障且视力优于6/24。26名年龄匹配的受试者晶状体透明。使用佩利-罗布森字母表测量低和中等空间频率下的对比敏感度（CS）。使用Mentor亮度视力测试仪（BAT）结合对数最小分辨角视力表和佩利-罗布森字母表获得两种眩光失能（GD）测量值。尽管在早期白内障中，CS主要在高空间频率受到影响，但我们发现一些受试者在佩利-罗布森字母表上的得分降低。这种CS损失无法通过视力测量预测，尤其在患有后囊下白内障的受试者中发现。在许多视力相对较好的受试者中发现了高GD得分，且无法从视力或CS结果中预测。我们建议，使用佩利-罗布森字母表和BAT进行CS和GD测量可为早期白内障患者的管理提供有价值的信息。
