Visual Acuity as a Function of Wavelength in Three Catarrhine Species

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Abstract
The visual acuity criterion was used to determine the relative spectral luminous efficiency function at scotopic and photopic levels in the rhesus monkey, sooty mangabey, and olive baboon. The stimulus energy necessary to resolve gratings subtending 11.235 and 1.976 min of arc was determined at nine wavelengths. The coarser gratings had a visual acuity requirement of 0.089, which could be resolved at very dim luminance levels, while the finer gratings had an acuity requirement of 0.506, which could be resolved only at very high luminance levels. The relative luminous efficiency functions obtained with the coarse gratings were comparable for the three species except in the long wavelength region where the baboons were relatively less sensitive and the mangabeys relatively more sensitive than the rhesus. With the finer gratings, the major differences among species again were in the long wavelength region with the rhesus showing a pronounced relatively reduced sensitivity.

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