Psychology 2015A/B Study Guide - Midterm Guide: Opsin, Eye Strain, Sensory Neuron

• School: Western University
• Department: Psychology
• Course: Psychology 2015A/B
• Professor: John Campbell

Document Summary

Energy described by wavelength, spectrum ranges from short wavelength (gamma rays) to long wavelength (radio waves) Visible spectrum for humans ranges from 400 to 700 nanometers, most perceived light is reflected light. An image of tree is focused on retina, which lines back of the eye. The close-up of retina shows receptors and other neurons that make up retina. Light enters through pupil and is focused by cornea and lens to reflect image on retina. Rods and cones are visual receptors in retina that contain visual pigment. Optic nerve carries information from retina toward brain. Peripheral has both rods and cones (more rods) About 120 million rods and 6 million cones. Macular degeneration is when fovea and surrounding area are destroyed creating a (cid:862)(cid:271)li(cid:374)d spot(cid:863) on retina. Retinitis pigmentosa, a genetic disease where rods are destroyed first. Foveal cones can also be attacked, severe cases result in complete blindness.