SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Retina. Ophthalmoscope view of the retina of a healthy human eye. The retina is the light- sensitive membrane at the back of the eye. Blood vessels extend across the retina from the optic disc (lower centre). This is the blind spot of the eye. The optic nerve (not seen) also meets the retina at this point. The retina holds millions of light-sensitive cells. Rod cells are responsible for low-light vision, and cone cells are responsible for colour vision (which requires high light levels). The optic nerve carries signals to the brain, where the image in interpreted.
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