Skip to content

    Eye Health Center

    Font Size
    A
    A
    A

    Eye Health Glossary

    Achromatopsia: A hereditary condition in which people lack certain receptors in their retinas, causing them to be nearly or completely colorblind and to have poor visual acuity.

    Alpha-2 agonists: A medication used to treat glaucoma that helps by inhibiting the production and increasing the drainage of aqueous humor, thereby reducing the pressure inside the eye.

    Recommended Related to Eye Health

    Zinc for Vision

    Zinc is an essential trace mineral that's important for the immune system and the brain, as well as other parts of the body. In infants, zinc deficiency can delay normal development. At any age, serious zinc deficiency can lead to risk of infections. Eye-related benefits. Zinc is believed to be important for vision because high levels of the mineral are found in the macula, part of the retina. Zinc enables vitamin A to create a pigment called melanin, which protects the eye. Some studies...

    Read the Zinc for Vision article > >

    Amblyopia: Also known as "lazy eye," amblyopia is a condition that starts in childhood in which vision has not developed properly in one eye or the other. If amblyopia is left untreated, a child's vision will not develop correctly, and as the brain matures, one eye will remain with poor vision.

    Aqueous humor: The clear, watery fluid between the lens and the cornea.

    Astigmatism: A condition in which blurred vision is caused by the cornea being shaped more like a football than spherical like a basketball. Astigmatism may be compensated for through eyeglasses or contacts, or it can be corrected through refractive surgery.

    Beta-blocker: A medication used in the treatment of glaucoma, beta-blocker eye drops help reduce the pressure within the eye by reducing the production of aqueous humor.

    Carbonic anhydrase inhibitor: A type of medication used to treat glaucoma. Carbonic anhydrase inhibitors work by reducing the production of aqueous humor, thereby reducing pressure inside the eye.

    Choroid: The layer of blood vessels between the retina and the sclera.

    Choroiditis: A form of uveitis that causes an inflammation of the layer beneath the retina.

    Conjunctiva: A thin layer of tissue that lines the inside of the eyelids as well as the outer surfaces of the sclera.

    Conjunctivitis: Inflammation of the conjunctiva, also called "pinkeye."

    Cornea: The clear outer layer of the eye. It covers the iris.

    Cryotherapy: A surgical procedure in which abnormal cells are destroyed by freezing them.

    Cyclitis: A form of uveitis that causes inflammation of the middle portion of the eye and may affect the muscle that focuses the lens. Cyclitis may develop suddenly and last several months.

    Dilation: Expansion of the pupil with medicated eye drops.

    Enucleation: A procedure in which the eye is removed.

    1 | 2 | 3 | 4

    Today on WebMD

    Woman holding tissue to reddened eye
    Learn about causes, symptoms, and treatments.
    eye
    Simple annoyance or the sign of a problem?
     
    red eyes
    Symptoms, triggers, and treatments.
    blue eye with contact lens
    Tips for wearing and caring.
     
    Understanding Stye
    Article
    human eye
    Article
     
    eye
    Video
    eye exam timing
    Video
     
    vision test
    Tool
    is vision correction surgery for you
    Article
     
    high tech contacts
    Article
    eye drop
    Article