Abstract
An improved laser interferometer allows forced choice contrast sensitivity measurements that are relatively unaffected by optical blurring in the eye. At spatial frequencies above about 60–70 c/deg. the regular bars of the interference fringe are no longer visible: observers report a pattern resembling zebra stripes centered on the line of sight. The characteristics of this pattern are consistent with the hypothesis that it is a moirépattern resulting from aliasing by the foveal cone mosaic. Properties of this moirépattern allow an assessment of the regularity of the foveal lattice, the spacing between cones, and the light-catching area of individual cones.
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