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Ch.6 Vision. 1  Describe the characteristics of light and color, outline the anatomy of the eye and its connections with the brain, and describe the process of transduction of visual information. 2  Describe the coding of visual information by photoreceptors and ganglion cells in the retina. The photoreceptors form synapses with bipolar cells, neurons whose two arms connect the shallowest and deepest layers of the retina. 2  In turn, these neurons form synapses with the ganglion cells, neurons whose axons travel through the optic nerves (the second cranial nerves) and carry visual information into the brain.
The retina has about 6 million cones and 120 million rods. Cones are cone shaped structures and are required for bright light (day light) vision. Rods are rod like structures and are required for dim light (twilight/ night) vision. Both rods and cones contain light sensitive pigments. Rod cells contain a purplish pigment known as visual purple or rhodopsin and it is formed from vitamin A.