PSYCH 2E03 Lecture Notes - Lecture 22: Spectral Sensitivity, Spectrophotometry, Photopic Vision
19 Nov 2016
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Document Summary
Retina: thin film of cells that lines the inside back of the eye, optical image is cast on it, part of the central nervous system, contains 5 types of cells, including photoreceptors. Photoreceptors make up the outermost layer of cells in the retina. Located furthest back from inside of the eye. Photoreceptors and the pigmented epithelium absorb light. Site of visual transduction for the visual system. Pigmented epithelium, when light enters, it absorbs excess light that isn"t being absorbed by photoreceptors. 2 different types of photoreceptors allowing us to see in different environments, across different lighting: rods or cones. These 2 are similar but also different, functionally different. Rods: cylindrical, 120 million, periphery of retina, mediate night vision. Cones: conical, 6 million, mostly in fovea, mediates day vision, 3 types. Both have synaptic terminal at the end where neurotransmitters are going to be released (main one released is glutamate)
