11. Cattle have two kinds of color receptors in the cone cells of their retinas. 12. The human retina contains about 120 million rod cells and 6 million cone cells . 13. Some areas have higher densities of cone cells , for example ( see fovea ). 14. Their eyes contain very few cone cells , likely due to the murky water they inhabit. 15. A similar enzyme exists in the cone cells responsible for color vision in the retina. 16. Terns have red oil droplets in the cone cells of the retinas of their eyes. 17. The double-opponent cells are receptive to opposite inputs from different cone cells in the retina. 18. Color resolution is not so good-4.5 million cone cells . 19. Generalized PRA can be divided into either dysplastic disease, where the rod or cone cells . 20. As cone cell says-the number of cones drops off around the periphery of the retina.
