PHYS 215 Lecture Notes - Lecture 10: Ciliary Muscle, Amacrine Cell, Ciliary Body
21 Sep 2016
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Light properties: photons, wavelength, visible light. 400 700 nm: intensity, ray. Bending of a light ray: concave, convex, cornea and lens, accommodation. Increasing the strength (shape) of the lens (near visions) Visual problems: myopia nearsighted, hyperopia farsighted, presbyopia age related farsightedness, astigmatism. Phototransduction is the conversion of light stimuli into neural signals: photoreceptor. Three parts: outer segment, an inner segment, and a synaptic terminal: rhodopsin. Open in the absence of light: three photopigments. Color vision in the presence of light: color vision depends on the ratio of stimulation of the three types of cones. Dark and light adaption: dark adaption. Regeneration of rod photopigments: light adaption. Visual information is modified: information reaching the visual cortex. Not a replica of the visual field: thalamus and visual cortexes elaborate the visual message, hierarchy of visual processing, visual processing goes to other areas of the brain not involved in vision perception. Rods: rods have rhodopsin consisting of:
