Abstract
Using circular gratings, where luminance L=Lo [1 + m sin(2πfE + ø)] was modulated as a function of eccentricity E in angular degrees of the visual field, we measured Michelson contrast sensitivity as a function of relative grating size, calculated as Af2 and expressed in terms of the number of square cycles. As with linear gratings (e.g., vertical bars and horizontal luminance modulation), the increase of contrast sensitivity with Af2 was similar at all spatial frequencies studied and saturated between 100-200 square cycles irrespective of spatial frequency. In addition, contrast sensitivities for a linear and circular grating were similar irrespective of spatial frequency (f) or grating area (A).
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