Images of the cone mosaic from individuals with different cone opsin mutations. Images are from 1-degree temporal retina from a normal trichromat (A), a dichromat harboring a pigment with the LIAVA polymorphism (B), and a dichromat harboring a pigment with the C203R missense mutation (C). While both dichromats have approximately the same reduction in cone density (31,771 cones/mm2 for the LIAVA retina; 27,799 cones/mm2 for the C203R retina, compared with normal of 55,184 cones/mm2), the arrangement of the remaining cone photoreceptors is more regular for the C203R retina.73 Scale bar = 50 μm.