PSYCH 212 Lecture Notes - Lecture 9: Retinal Ganglion Cell, Optic Disc, Visual Acuity
9 Feb 2017
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Document Summary
Eye is elaborate structure with optical functions (capturing light and forming detailed spatial images) and neural functions (transducing light into neural signals and processing those signals) cornea - clear outer covering that bends light (refracting) Forming a backward inverted image on the light sensitive iris - colored part of eye that regulates amount of light reaching retina. Opens (sympathetic) and closes (parasympathetic) to allow more or less light in through an opening called the pupil lens - focuses light. Ciliary muscle - adjust curvature of the lens to focus near or far objects (accomodation) retina - thin layer of neurons in the back of the eye. Where light energy initiates neural activity (visual transduction) fovea - central region of the retina. Highest density of photoreceptors (cones only) so sharpest visual acuity optic disc - where axons of the optic nerve leave the eye. Forms a blind spot due to lack of photoreceptors extra ocular muscles - precisely control eye movements.
