What is glaucoma?
is a disease of the optic nerve, which is the part of the eye that carries the
images we see from the eye to the brain. The optic nerve is made up of many
nerve fibers (like an electric cable containing numerous wires). Glaucoma
damages nerve fibers, which can cause blind spots in our vision and vision loss
has to do with the pressure inside the eye, or intraocular pressure
(IOP). When the clear liquid called the aqueous humor--which normally flows in
and out of the eye--cannot drain properly, pressure builds up in the eye. The
resulting increase in IOP can damage the optic nerve.
most common form of glaucoma is primary open-angle glaucoma,
where the aqueous fluid that normally circulates in the front portion of
the eye is blocked from flowing back out of the eye through a tiny drainage
system. This causes the pressure inside your eye to increase, which can damage
the optic nerve and lead to vision loss. Most people who develop primary open-angle
glaucoma notice no symptoms until their vision is impaired.
glaucoma, the iris (the colored part of the eye) may drop over and
completely close off the drainage angle, abruptly blocking the flow of aqueous
fluid and leading to increased IOP or optic nerve damage. In acute angle-closure
glaucoma there is a sudden increase in IOP due to the buildup of aqueous fluid.
This condition is considered an emergency because optic nerve damage and vision
loss can occur within hours of the problem. Symptoms can include nausea,
vomiting, seeing haloes around light, and eye pain.
people with "normal" IOP can experience vision loss from glaucoma.
This condition is called normal tension glaucoma. In this type of
glaucoma, the optic nerve is damaged even though the IOP is considered normal.
Normal tension glaucoma is not well understood, but we do know that lowering
IOP has been shown to slow progression of this form of glaucoma.
glaucoma is rare, and starts in infancy, childhood or adolescence. Like
primary open-angle glaucoma, there are few, if any, symptoms in the early
stage. Blindness can result if it is left untreated. Like most types of
glaucoma, this type of glaucoma may run in families.
ophthalmologist may tell you that you are at risk for glaucoma if you have one
or more risk factors, including elevated IOP, a family history of glaucoma, a
particular ethnic background, advanced age, or certain optic nerve conditions.
Regular examinations with your ophthalmologist are important if you are at risk
for this condition.