Vision

wavelengths

distance from the peak of one light wave to another

hue

dimension of color that is determined by the wavelength

intensity

amount of energy in a light wave; intensity/ light is determined by wave’s height

short wave lengths =

high frequency

long wavelengths =

low frequency

cornea

eye’s clear, protective outer layer

pupil

adjustable opening in the center of eye where light enters

iris

ring of muscle that forms colored portion and controls the size of the pupil opening

lens

transparent structure behind the pupil that changes shape to help focus images on the retina

accommodation

process where eye’s lens changes shape to focus images of near and far objects on the retina

retina

light-sensitive back inner surface of the eye, containing receptor rods and cones, plus neurons that begin to process the visual information

rods

retinal receptors that detect black, white, and gray. Sensitive to movement. Necessary for peripheral vision and twilight vision when cones doesn’t respond

cones

retinal receptors that are at the center of the retina. Function in daylight, detects fine details and give color sensations

fovea

central focal point in the retina around the eye’s cones which cluster

optic nerve

nerve that carries neural impulses from the eye to the brain

blind spot

optic nerve leaves the eye creating blind spot because no receptor cells are there

vitreous humor

helps eye retain it’s round shape, jelly like

choroid

supplies blood flow to the eye