Abstract

A spatial frequency model for vision requires that the diffraction pattern representations of the Fourier transformed equivalent of object information, as electric-field amplitude representations at the focal surfaces of two quasimonochromatic wavelength intervals, are coincident with rod and cone outer receptive segments.¹ A focal length and wavelength interdependency are linked to the accommodation necessary to achieve coincidence of the particular wavelength intervals with the retina. The correct magnitude of the horizon effect is quantifiable as 10% by measuring the horizontal cross sections of the apparently equal top and bottom parts of an appropriately selected numeral 8. A 1.55 times enhancement was previously established psychophysically as the ratio of apparent diameters of the zenith and horizon moons.

© 1987 Optical Society of America