PSYB51H3 Chapter Notes - Chapter 2: Optic Nerve, Emmetropia, Retina
13 Dec 2011
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An oscillation that travels through a medium by transferring energy from one particle or point to another without causing any permanent displacement of the medium. A quantum of visible light or other form of electromagnetic radiation demonstrating both particle and wave properties. A light-sensitive membrane in the back of the eye that contains rods and cones which receive an image from the lens and send it to the brain through the optic nerve. The process by which the eye changes its focus (in which the lens gets fatter as gaze is directed toward nearer objects). Refraction is necessary to focus light rays. Cornea, aqueous and vitreous humours help refract light although are fixed. Therefore, the lens uses accommodation to bring close objects into focus. Processes done through contraction of cillary muscle, which is attached to the lens by fibers called zonules. Literally old sight. the loss of near vision because of insufficient accommodation.
