The most common form of glaucoma is open-angle glaucoma. In open-angle glaucoma, the aqueous,
or fluid, that normally flows through the pupil into the anterior chamber (the
front section of the eye's interior) cannot get through the trabecular meshwork
(the eye's filtration area) to the normal drainage canals. This causes a
buildup of pressure in the eye (intraocular pressure, or IOP), which can damage
the optic nerve and lead to vision loss.
| Most people who develop open-angle glaucoma notice no
symptoms until vision is impaired. |
In angle-closure glaucoma,
the normal drainage canals are blocked when the area between the iris and the
cornea is not open. This condition can be chronic (progressing slowly or
occurring persistently) or acute (occurring suddenly).
In acute angle-closure
glaucoma there is a sudden increase in intraocular pressure (IOP)
due to the buildup of aqueous in the eye
Acute angle-closure glaucoma is
considered an emergency because optic nerve damage and subsequent vision loss
can occur within hours of the onset of the problem. Symptoms of this kind of
glaucoma can include nausea and vomiting, seeing haloes around light, and pain
in the eye. |
Chronic angle-closure glaucoma,
like open-angle glaucoma, may cause vision damage without symptoms. Although
angle-closure glaucoma is unusual, people of Asian or Eskimo ancestry are at
higher risk of developing it. As with other forms of glaucoma, age and family
history are also risk factors, and the problem seems to occur in older women
more often than others.
Both open-angle and angle-closure glaucoma can
be primary or secondary. A primary condition is one that cannot be attributed
to any known cause. A secondary condition can be traced to another cause, such
as previous injury or illness. |
| "Normal (or low) tension"
glaucoma is an unusual and poorly understood form of the disease. In
this type of glaucoma, the optic nerve is damaged even though the patient's
intraocular pressure is consistently within a range usually considered normal.
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| Childhood glaucoma is
rare, and starts in infancy, childhood or adolescence. Like open-angle
glaucoma, there are few, if any, symptoms in the early stage, and blindness can
result if it is left untreated. Like most types of glaucoma, this type of
glaucoma is thought to have a hereditary component. |
Congenital glaucoma is a type
of childhood glaucoma that usually appears soon after birth, although it can
become apparent later in the first year of life. Unlike other childhood
glaucomas, congenital glaucoma often has noticeable signs, including tearing,
light sensitivity, and cloudiness of the cornea. This type of glaucoma is more
common in boys, and can affect one or both eyes.
Your ophthalmologist
may tell you that you're a glaucoma suspect if you have one or more risk
factors for glaucoma. These may include elevated intraocular pressure (IOP),
family history, ethnic background, older age, optic nerve appearance, and other
factors.
Elevated IOP is sometimes called ocular hypertension. This
means that your IOP is higher than what is considered "normal." A diagnosis of
ocular hypertension does not mean you have glaucoma, but it does mean you're at
increased risk, and should probably have frequent medical eye examinations.
Sometimes your ophthalmologist will recommend medication to lower your IOP.
Treatment for glaucoma may include medication and/or surgery. |
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