Abstract
Co‐authors: Yun Chen and Weizhong Lan.The central fovea is known to lack S‐cones. A nice psychophysical demonstration was introduced by Magnussen et al, Vision Res 2001. If the computer screen is sinusoidally modulated in brightness at about 1 Hz and is viewed through a blue filter that transmits below 480 nm, the “foveal blue scotoma” becomes visible as a small irregular black spot that follows fixation. It is highly variable among subjects. We studied the possible reasons ‐ foveal shape or macular pigment distribution. We found that the steeper the foveal slopes and the narrower the foveal pit, the larger the foveal blue scotoma. We found no correlation with macular pigment distribution or Maxwell's spot. Therefore, the foveal blue scotoma appears to be a consequence of the lack of S‐cones in the foveal center. Unlike the foveal blue scotoma, Maxwell's spot is based on macular pigment as previously proposed.
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