PSY 3108 Lecture Notes - Lecture 11: Optic Disc, Photopsin, Ganglion Cell Layer
11 Dec 2016
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Document Summary
Layers of retina- front of eye- ganglion cell layer, inner nuclear layer, photoreceptor layer, pigment epithelium. Four types of photoreceptors: rods (1) cones (3) 120 million rods versus 6 million cones rods for night vison cones for day. 3 cone types: short, medium, and long wavelengths or s,m,l cone. Rods drop maximally dense in macula with density again dropping towards peripheral retina. Blind spot- optic disc- place where optic nerve leaves eye. Hole in vision so other eye covers it. Located in periphery, where acuity is low anyway. Fovea is specialized for detailed vision, periphery is specialized for low light vision. Averted vision: look slightly away from things at night to see them better. The process of transducing light energy into bioelectric signal neurons is known as phototransduction. Similar to the transduction processes we"ve seen in other senses. However, it has some odd, even backward, aspects.
