Visual acuity and contrast sensitivity of the S cone pathway: preliminary measures with letter charts.
Letter charts were used to measure visual acuity and peak contrast sensitivity of the short wavelength sensitive (S cone)-pathway. The accommodative response was monitored retinoscopically. The mean visual acuity (0.92 logMAR) and spatial contrast threshold (8.7%) were comparable to values reported elsewhere, and variability was relatively low. Both S-pathway acuity and contrast sensitivity were selectively reduced in one patient with central serous retinopathy and in another with retinitis pigmentosa. These simple spatial tests offer an additional index of S-pathway integrity which will be useful for detection and evaluation of ocular disease.
Rabin
J
J
School of Optometry, University of California, Berkeley.
Adams
A J
AJ
D000065:Accommodation, Ocular; D000328:Adult; D015350:Contrast Sensitivity; D006801:Humans; D008875:Middle Aged; D010786:Photoreceptor Cells / Q000502:physiology* / Q000503:physiopathology; D012164:Retinal Diseases / Q000503:physiopathology; D012174:Retinitis Pigmentosa / Q000503:physiopathology; D014787:Vision Tests / Q000379:methods; D014792:Visual Acuity; D014795:Visual Pathways / Q000502:physiology* / Q000503:physiopathology