[Value of a study of contrast sensitivity in the evaluation of visual function: applications to pathology and visual selection].

Spatial contrast sensitivity function appears to give the most general description available for the basic aspect of spatial visual performance. Classical measurement of visual acuity is unable to give us a fine appreciation of visual function. Visual acuity is only one aspect of the complex process of sight. We have tested contrast sensitivity to detect silent lesions of the visual pathway. In multiple sclerosis we have demonstrated a bilateral involvement in almost all cases. In primary open angle glaucoma contrast sensitivity is affected before perimetry data are able to show any defect. We have the same results in early stages of diabetic retinopathy. Contrast sensitivity testing shows great promise for detection of eye defect in drivers and industry workmen.