||Macaque Macaca nemestrina
||Curcio CA, Sloan KR Jr, Packer O, Hendrickson AE, Kalina RE. Distribution of cones in human and monkey retina: individual variability and radial asymmetry. Science. 1987 May 1 236(4801):579-82. p.580 right column top paragraphPubMed ID3576186
||Nomarski differential interference contrast optics allowed researcers to view optical sections at different levels along the long axis of photoreceptors. Researchers developed software that transforms the data from locations in the whole mount back to spherical coordinates by using the fovea and optic disk as reference points and retinal vasculature to connect across cut edges. Measured in 37µm×54µm fields.
||Mean of measurements in two monkeys, 188,000 and 190,000 cones/mm^2. For peak mean density in human see BNID 105344