Spatial contrast sensitivity. Importance of controlling the patient's visibility criterion
K. E. Higgins, M. J. Jaffe, N. J. Coletta, R. C. Caruso and F. M. de Monasterio
Clinical spatial contrast sensitivity measurements are typically made using
psychophysical methods that do not specify the response criterion being
used by the patient in judging grating visibility. Results of this report
show the necessity of such methods for (1) maximizing detectability of
early contrast sensitivity deficits by minimizing normal sample variance,
and (2) ensuring that changes in an individual's contrast sensitivity
reflect changes in vision and not simply fluctuations in the patient's
criterion for judging grating visibility.
