Cone opponency in the primate retina

摘要

A schematic representation of the mosaic arrangement of cones in the monkey retina that are sensitive to long (L, red), middle (M, green) and short (S, blue) wavelengths of light S cones are rare, constituting 5-10% of the mosaic, and L cones outnumber M cones by about 2 to 1. L and M cones are arranged near randomly. For simplicity, the cone mosaic is shown as rectangular in arrangement. The actual mosaics are more hexagonal and also less regular3: in the central all-cone fovea, cones are tightly packed, whereas in the retinal periphery they are separated by the more numerous rod photoreceptors, which are used for seeing in dim light.