Eye Parts and Functions

Pupil

*Black circle that you see in your eye *Lets light into your eye

Iris

*Colored part of the eye *Muscular diaphram that controls the size of the pupil and the ammount of light you let into your eye *Located between cornea and lens

Ciliary Muscles

*Controls the focusing ability of the lens *Surrounds the the outer edge of the iris

Retina

*Light sensitive layer of the eye *detects images focused on the back of the eye *Connected to the brain by the optic nerve *Contains cones and rods

Lens

*Refracts light *Helps focus light rays on retina *Located behind the pupil

Astigmatism

*When light rays focus more on one place of the Retina *Objects near and far are blurry

Cornea

*the transparent covering that covers the iris and the pupil *rounded shape *focuses the light that enters the eye

Rods

Allow you to see black and white

Cones

Allow you to see color

Optic Nerve

Carries information from the retina to the brain

What is another name for farsighted

Hyperopia

Blind Spot

Place where the optic nerve leaves the retina and they're no cones or rods

Aqueous Humor

The clear fluid that gives the cornea it's rounded shape

Vitreous Humor

The thick clear gel that fills the eye cavity and gives the eyeball it's rounded shape

Sclera

Thick, though outer covering of the eyeball

Retinal Retention

When an image stays on the retina for a sixteenth of a second after the object is removed

After Image

When the retina become fatigued with color and sees the complementry color

What is another name for nearsighted

myopic

When light rays are focused behind the retina...

you are far sighted

When light rays are focused in front of the retina...

you are near sighted