PSYC 2145 Chapter 3: Ch. 3 Reading Notes (63-92)
Document Summary
Light enters the eye through the cornea, and the cornea and lens refract the light rays to produce a sharply focused image on the retina. The iris can open or close to control the amount of light that reaches the retina. The retina is made up of 3 layers the rods and cones, which are the photoreceptors; the bipolar cells; and the ganglion cells, whose axons make up the optic nerve. Sensitive to very low levels of light. Color-blind, so they can distinguish different intensities of light (perception of brightness) 3 different types - each has its own pattern of sensitivities to different wavelengths. Ability to see detail (known as acuity - higher in cones than rods) Fovea - the very center of the retina ( the region of the retina with the greatest acuity) Photoreceptors stimulate bipolar cells, which in turn excite ganglion cells.
