Abstract

The parafoveal short-wavelength-sensitivity mechanism in a protanopic patient with retinitis pigmentosa was found to lack the secondary (long-wavelength) field-sensitivity mode, a property that is characteristic of Stiles’s pi 1 mechanism. The results document that normal protanopic observers also lack this mode and reject the hypothesis that the present measurements reflect a pi 3-like—rather than the pi 1-like—mechanism.

© 1982 Optical Society of America

Early-stage abnormality of foveal pi mechanisms in a patient with retinitis pigmentosa

Rockefeller S. L. Young
J. Opt. Soc. Am. 72(8) 1021-1025 (1982)

Foveal Sensitivity for a Protanope in Relation to Stiles’ “Blue” and “Green” Mechanisms

S. R. Das
J. Opt. Soc. Am. 54(6) 839-841 (1964)

Pi-4: adaptation of more than one class of cone

Claude Sigel and Lisa Brousseau
J. Opt. Soc. Am. 72(2) 237-246 (1982)

Loss of color vision and Stiles’ ∏₁ mechanism in a patient with cerebral infarction

Rockefeller S. L. Young and Gerald A. Fishman
J. Opt. Soc. Am. 70(11) 1301-1305 (1980)

Stiles’s Π₅ color mechanism: Tests of field displacement and field additivity properties

C. Sigel and E. N. Pugh
J. Opt. Soc. Am. 70(1) 71-81 (1980)