Questions: Put the following retina layers in order from inside to out: photoreceptors, ganglion nerves, sclera, and choroid.

Answer: If you define “inside” as the middle of the vitreous cavity, and “outside” as the outer wall of the eye, then:

1. Ganglion Nerves
2. Photoreceptors
3. Choroid
4. Sclera

The key points here are the light must pass through the ganglion nerves and many other supporting cells before it actually hits those photoreceptors. Also, the photoreceptors get their nutrition from the underlying choroidal blood supply.