Abstract

The absolute threshold sensitivity for a protanopic fovea has been determined. The sensitivity curve gives a good fit with Stiles’s π₄ curve in the longer wavelengths region, as expected. Results are compared with those of Graham and Hsia, and of Boynton et al., and the relations discussed. Three t.v.i. curves have also been obtained for the protanope, who does not seem to have a π₂ branch. Moreover, the π₁ branch is rather long, before π₃ takes over.

© 1964 Optical Society of America

Foveal Increment Thresholds in Dark Adaptation

S. R. Das
J. Opt. Soc. Am. 54(4) 541-546 (1964)

Field sensitivity of the short-wavelength-sensitive mechanism in the protanope’s parafoveal retina

Rockefeller S. L. Young
J. Opt. Soc. Am. 72(8) 1026-1028 (1982)

Rapid Chromatic Adaptation of Normal and Dichromatic Observers*

Robert M. Boynton, Gillray Kandel, and Judith Wheeler Onley
J. Opt. Soc. Am. 49(7) 654-666 (1959)

Some Comparisons among Spectral Sensitivity Data Obtained in Different Retinal Locations and with Two Sizes of Foveal Stimulus*

Harry G. Sperling and Yun Hsia
J. Opt. Soc. Am. 47(8) 707-713 (1957)

Colorimetry in Parafoveal Fields.* I. Color-Matching Functions

Isadore Nimeroff
J. Opt. Soc. Am. 54(6) 824-832 (1964)