PSYCH 9A Lecture Notes - Lecture 8: Spectral Sensitivity, Sclera, Color Television
Document Summary
Its stimulus is light, which varies in. Amplitude corresponds to our perception of brightness. Wavelength corresponds to our perception of color. Eye structures, like the cornea, iris and lens. Control amount of light entering the eye. The human visual system is sensitive to only a tiny part of the electromagnetic spectrum of light. This causes the lens to yellow and eventually become brow and more opaque as a person gets older. Photoreceptors - located on the retina, a light-sensitive cell located on the retina that converts light energy into neural impulses; inside each photoreceptor is a photopigment (reused). Iris - an opening through which light enters the eye; colored muscle that contracts and dilates (blue or brown). Cornea - transparent surface that acts as eye"s principal focusing element. Lens - crystalline structure providing secondary focus; flattened to allow proper focus on objects farther away; take on a more spherical shape to focus on a nearby object.
