Eye Parts

Front 1

Pupil

Back 1

adjustable opening in the center ( of the eye that controls amount of light bright conditions, iris expands, pupil smaller; dark conditions, iris contracts, pupil larger)

Front 2

Iris

Back 2

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

Front 3

Cornea

Back 3

near the center of the retina that begins to focus the light by bending it; protects the eye

Front 4

Lens

Back 4

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

Front 5

Retina

Back 5

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

Front 6

Optic Nerve

Back 6

carries neural impulses from the eye to the brain

Front 7

Blind Spot

Back 7

point at which the optic nerve leaves the eye, creating a no receptor cells located there “ blind spot ” because there are

Front 8

Fovea

Back 8

central point in the retina; highest concentration of rods and cones; area of sharpest vision (visual acuity)

Front 9

Rods

Back 9

visual receptors that detect black and white and respond to less light.

Front 10

Cones

Back 10

visual receptors that detect sharp images and color and respond to more light.

Front 11

Ganglion cells

Back 11

neurons that pass information from the bipolar cells; their axons form the optic nerve.

Front 12

Photoreceptors

Back 12

light-sensitive cells (neurons) in the retina that convert light energy into neural energy. That is, light energy strikes the rods and cones to produce chemical changes that general neural signals.

Front 13

Optic Nerve

Back 13

The bundle of neurons that carries the visual information from the retina to the thalamus to the occipital lobe of the brain Where the stimulus, once changed into a neural impulse, gets passed onto the brain.

Front 14

Blind Spot

Back 14

The point where the optic nerve exits the eye and where there are no photo-receptors. Any stimulus that falls on this area cannot be seen. We do not notice it because each eye compensates for the other and your brain “fills in” for the missing information. (top-down process & Gestalt)