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    What Are the Types of Glaucoma?

    There are two main types of glaucoma:

    Open-angle glaucoma. Also called wide-angle glaucoma, this is the most common type of glaucoma. The structures of the eye appear normal, but fluid in the eye does not flow properly through the drain of the eye, called the trabecular meshwork.

    Angle-closure glaucoma. Also called acute or chronic angle-closure or narrow-angle glaucoma, this type of glaucoma is less common in the West than in Asia. Poor drainage is caused because the angle between the iris and the cornea is too narrow and is physically blocked by the iris. This condition leads to a sudden buildup of pressure in the eye.

    Who Gets Glaucoma?

    Glaucoma most often occurs in adults over age 40, but it can also occur in young adults, children, and even infants. In African-Americans, glaucoma occurs more frequently and at an earlier age and with greater loss of vision.

    You are at an increased risk of glaucoma if you:

    • Are of African-American, Irish, Russian, Japanese, Hispanic, Inuit, or Scandinavian descent
    • Are over age 40
    • Have a family history of glaucoma
    • Have poor vision
    • Have diabetes
    • Take certain steroid medications, such as prednisone
    • Have had trauma to the eye or eyes

    What Are the Symptoms of Glaucoma?

    For most people, there are usually few or no symptoms of glaucoma. The first sign of glaucoma is often the loss of peripheral or side vision, which can go unnoticed until late in the disease. This is why glaucoma is often called the "sneak thief of vision."

    Detecting glaucoma early is one reason you should have a complete exam with an eye specialist every one to two years. Occasionally, intraocular pressure can rise to severe levels. In these cases, sudden eye pain, headache, blurred vision, or the appearance of halos around lights may occur.

    If you have any of the following symptoms, seek immediate medical care:

    • Seeing halos around lights
    • Vision loss
    • Redness in the eye
    • Eye that looks hazy (particularly in infants)
    • Nausea or vomiting
    • Pain in the eye
    • Narrowing of vision (tunnel vision)