AP PSYCH U1 Sensation and Vision

cornea

the eye’s clear protective layer that covers pupil and iris and bends light to provide focus

pupil

adjustable opening in center of eye where light enters

iris

a colored muscle that controls how much the pupil opens

lens

transparent structure that focuses to reflect light rays on back of retina

rods

receptors that detect black, white, and gray. sensitive to movement and necessary for peripheral and twilight vision

cones

receptors that function in daylight or well lit conditions and detect color and detailed stimuli

optic nerve

nerve that carries neural impulses from eye to brain

ganglion and bipolar cells

core middle and relay sequence of retina that transmits visual data from photoreceptors to brain. set of by chemical changes in rods and cones.ganglion cells intertwin to form the optic nerve

blind spot

point where the optic nerve leaves the eye and there are no receptor cells there