Article

Simple clinical techniques to evaluate visual function in patients with early cataract.

Clinical Vision Research Unit, University of Bradford, West Yorkshire, United Kingdom.
Optometry and Vision Science (impact factor: 2.11). 12/1990; 67(11):822-5. pp.822-5
Source: PubMed

ABSTRACT 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.

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Keywords

26 age-matched subjects
 
80 subjects
 
Contrast sensitivity
 
CS
 
CS loss
 
GD scores
 
glare disability
 
good VA
 
intermediate spatial frequencies
 
logMAR VA chart
 
Mentor Brightness Acuity Tester
 
neural function
 
patients
 
Pelli-Robson chart
 
Pelli-Robson letter chart
 
posterior subcapsular cataract
 
scores
 
VA measurements
 
valuable information
 
visual acuity