Stereoscopic acuity for photometrically matched background wavelengths at scotopic and photopic levels

Abstract

Two Sa made equidistance settings in a two-rod apparatus using white and four chromatic (red. yellow. Feen. and blue) backgrounds. photometrically matched at each of eight or nine teat levels within a total retinal-illuminance range of 4 log units. The binocular depth settinglJ were analyzed in terms of the angular magnitude of both the Yariable error. flAD. and the conatant error. flAR' When flAD is plotted as a function of retiDal illuminance, the CU1'V88 for each of the four chromatic IIIId white backlfOund CODditiona show that at low retinal illuminances, . flAD' is initially larIe, and with iacreuinI baeklfOund illumination. fl A D pro. . . .vely deere • to approach a final low asymptotic value.~predicted by the duplicity theory of vision. each experimental curve Thows a dircontinulty at about -1.0 lot td (corresponding to a background luminance value of about 0.0069 fL with the 2.6-mm artificial pupil used) reflecting the tranrition from rod to cone functioning. The curves representing the different wawlengtha essentially O'Verlap throughout the total illumination range, indicating that, for both rod and cone vision, wavelength has no differential effect on the variability of depth settings. 'nle data for flAR are less regular than those for 1"1 AD' and the rod-cone discontinuities appear less pronounced. The data are analyzed in terms of the relative contribution of the rod and cone mechanisms to performance level.

Simple time reaction as a function of luminance for various wavelengths

“…Such complete overlapping has been previously demonstrated in this laboratory in the case of stereoscopic vision, both for equidistance settings of chromatic targets presented on a bmck background (Dwyer & Lit, 1970) and when black targets were presented against chromatic backgrounds. 1…”