PSY 311 Lecture Notes - Lecture 2: Ophthalmoscopy, Retina, Isomerization
Document Summary
Regulates the light entering the eye by expanding and contracting the pupil. Receives images from the lens and sends it to the brain through the optic nerve. Optic nerve the nerve that sends impulses from eye to the brain. The central focal point of the retina where cones cluster. Light: absorbed when it hits dark surfaces, reflected when it hits colored surfaces, transmitted neither reflected nor absorbed, refracted bent. Increased sensitivity during dark conditions due to regeneration of rods & cones visual pigments. Rods take longer to adapt to the dark, but they are more sensitive than cones. Rod-cone break: person can"t see color: visual pigment bleaching, change in the color of the visual pigment molecule; caused by the separation of light sensitive molecule from opsin, visual pigment regeneration. Low visual acuity: midget bipolar cells (foveal vision, receive input from a single cone, high visual acuity.
