Abstract
The accuracy of steady-state accommodation for high contrast sinusoidal gratings was compared with the observers' contrast sensitivities for the same gratings. Stimuli ranging in spatial frequency from 0.5 to 19 c/deg were presented at optical distances ranging from 0 to 5 diopters, and accommodative responses were measured with a laser optometer. Contrast thresholds were obtained by the method of constant stimuli. The results showed that optimal performance for both accommodation and contrast sensitivity was obtained for spatial frequencies of 3–5 c/deg. while progressively diminished performance was obtained for higher and lower spatial frequencies. The accuracy of accommodation for sinusoidal gratings of intermediate spatial frequencies was equivalent to that for a square-wave grating of 4 c/deg. These findings imply that sharp edges are not necessary for accurate accommodative responses, and they suggest that mechanisms underlying foveal contrast resolution are also involved in the control of steady-state accommodation.
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