Abstract
When a high frequency grating is imaged on the parafoveal retina, it can appear to be oriented 90° from its true orientation. The orientation reversal occurs when the grating spatial frequency is twice the Nyquist frequency of the parafoveal cone mosaic, because the frequency spectrum of the sampled grating has aliased spatial energy near its origin that is oriented perpendicular to the actual grating orientation (Yellott, 1983; Coletta and Williams, 1987).
© 1996 Optical Society of America
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