The Human Eye

cornea

clear protective layer in the front of the eye

pupil

a circular opening that controls how much light enters the eye

iris

the colored part of your eye, adjusts the size of the pupil

retina

the back of the the inside of the eyeball, contains light-sensitive rods and cones

optic nerve

receives messages from the retina and then transmits messages to the brain

rod cells

cells located in the retina that respond to and recognize black and white

cone cells

cells located in the retina that respond to and recognize color

vitreous humor

the transparent, jelly-like tissue filling the eyeball behind the lens.

sclera

the white outer layer of the eye, provides support for the eyeball and allows attachment of muscles to the eyeball

aqueous humor

watery liquid found between the cornea and lens

fovea

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

ciliary body

ring of tissue behind the iris that holds the lens in place and changes the shape of the lens

lens

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

lacrimal gland

gland located in the upper outer region above the eyeball that secretes tears

lacrimal duct

the passageway that drains excess tears into the nose (#5 in the image)