At the optic disk all photoreceptors and accessory cells are pushed aside so the axons can penetrate the choroid and the sclera. This creates a hole in our vision, the blind spot. Normally each eye covers for the blind spot of the other, and the brain fills in missing information with whatever pattern surrounds the hole. Therefore we are not conscious of the blind spot. Photoreceptors are not distributed evenly throughout the retina.
Most cones lie in the fovea, whereas peripheral vision is dominated by rods.
Overall, rods greatly outnumber cones. To see a faint star, you cannot look directly at it, but must look slightly to the side. A person with macular degeneration can become functionally blind, yet their night vision is not really affected. The choroid , a highly vascular, highly pigmented layer between the sclera and the retina, is continuous with the ciliary body and the iris. Do not confuse it with the pigment epithelium.