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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.
Pupil The pupil contracts and expands depending on the amount of light, and can physically block the amount of light entering the eye in bright situations. 1  Rod and cone cells in the retina-Our eyes sense light with two different types of cells: rods and cones. 2  Rhodopsin-Rhodopsin is a chemical found in the rods.hen a molecule of rhodopsin absorbs a photon, it splits into a retinal and an opsin molecule. These molecules later recombine naturally back into rhodopsin at a fixed rate, and recombinatiÂ­on is fairly slow. So, when you expose your eyes to bright light, all of the rhodopsin breaks down into retinal and opsin.