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Cornea - The clear covering at the front of the eye that lets light rays into the eye

Cornea- The clear covering at the front of the eye that lets light rays into the eye

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Cornea- The clear covering at the front of the eye that lets light rays into the

eye

Pupil- A round opening that controls the amount of light entering the inner eye

Iris- The colored circle in the eye that surrounds the pupil and controls its size

Lens- A curved, inner part of the eye; it focuses light on the retina

Retina- The light sensitive tissue that lines the inner eye

Optic Nerve-Nerve that takes impulses to the brain

Rod- A receptor that is very sensitive to light but can only distinguish black from white

Cone- A receptor that can distinguish colors but is not very sensitive to light

Nerve Impulse- Electrical signal transmitted along nerves

Vitreous Humor- Jelly like fluid in the eyeball

Nearsightedness- (Myopia) A condition in which the retina is too far from the lens; A person sees only close objects clearly

Farsightedness- (Hyperopia) A condition in which the retina is too close to the lens; a person can see only distance objects clearly

Presbyopia- Lens becomes less flexible. Common after the age of 40.

Sclera- The white part of the eye. Composed of tough fibrous tissues that protects the inner layers of the eye.

Astigmatism- A condition in which the cornea or the lens is irregularly shaped, causing blurred vision

Color Blindness- A hereditary disorder in which a person can not distinguish certain colors

Glaucoma- A gradual increase of fluid pressure within the eye; it can damage the retina and lead to blindness

Cataract- A condition in which the lens of the eye becomes cloudy. More common among older people

Sty- An infection at the base of the eye lash

Conjunctivitis- Caused by a bacterial, virus, or allergic reaction. Primarily because of poor hygiene. Spread by direct contact. (Pink eye)

Detached Retina- Occurs when the retina tears away from the inner eyeball, this produces a blind spot around the tear.

Ophthalmologist- eye surgeon

Optometrist- eye doctor

Optician- lens maker