PHILOS 2D03 Study Guide - Visual Cortex, Ommatidium, Optic Disc
24 Oct 2013
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Document Summary
Amplitude: height of each wave, perception of brightness. Wavelength: distance between successive peaks, perception of colour. Purity: perception of saturation: single wavelength light = pure light which is completely saturated, desaturated light is combination of many wavelengths. Bees see uv spectrum to perceive differences of colour. Snakes see light in infrared spectrum to detect body heat. Curvature causes images to land on retina upside-down and reversed, but final image is product of brain activity. Neural cells arranged in three different layers. Photoreceptors in layer 1: translate light stimulus into neural signal: retinal pigment epithelium provides nourishment for photoreceptors at back of eye, photoreceptors would die without rpe. Neural signal passes through bipolar cells to ganglion cells. Axons of ganglion cells converge at the optic disc, then leave the eye to join the optic nerve which travels to the brain. Optic disc contains no photoreceptors (blind spot)
