Abstract

By using a heterochromatic brightness-matching technique, in which the test and comparison fields were presented in succession, spectral equal-brightness functions were measured in a dark-adapted state at a retinal illumination of 1000 photopic trolands at 6, 28, 45, and 65° temporally to the fovea. In addition, the spectral equal-brightness functions were measured at 10, 100, 1000, and 6400 photopic trolands at 17° temporally. In striking contrast with previous results, all the spectral brightness functions obtained were found to be basically scotopic in form, with peak sensitivities at about 500 nm. The difference in results between the present study and previous studies could be ascribed to the difference in method employed. Thus it was found that simultaneous, relative to successive, presentation of test and comparison fields depresses rod activity in the test field to a considerable extent. It was concluded that rods may function and influence the brightness response in extrafoveal vision at much higher intensity levels than was previously assumed.

© 1981 Optical Society of America

Extrafoveal spectral sensitivity during dark adaptation

Bjørn Stabell and Ulf Stabell
J. Opt. Soc. Am. 70(1) 81-86 (1980)

Absolute spectral sensitivity at different eccentricities

Bjørn Stabell and Ulf Stabell
J. Opt. Soc. Am. 71(7) 836-840 (1981)

Spectral sensitivity in the far peripheral retina

Bjørn Stabell and Ulf Stabell
J. Opt. Soc. Am. 70(8) 959-963 (1980)

Change of Threshold during Light and Dark Adaptation Following Exposures to Spectral Lights of Equal Scotopic and Equal Photopic Efficiencies*

Eberhard Dodt and Karl-Heinz Jessen
J. Opt. Soc. Am. 51(11) 1269-1274 (1961)

Photopic spectral sensitivity of the peripheral retina*†

Bill R. Wooten, Kenneth Fuld, and Lothar Spillmann
J. Opt. Soc. Am. 65(3) 334-342 (1975)