What is Glaucoma?
Glaucoma is a leading cause of blindness in the United States, especially
for older people. Loss of sight from glaucoma is preventable if you get
treatment early enough.
Glaucoma is a disease of the optic nerve. The optic nerve carries the
images we see to the brain. Many people know that glaucoma has something
to do with pressure inside the eye. The higher the pressure inside the
eye, the greater the chance of damage to the optic nerve.
The optic nerve is like an electric cable containing a huge number of
wires. Glaucoma can damage nerve fibers, causing blind spots to develop.
Often people don't notice these blind areas until much optic nerve damage
has already occurred. If the entire nerve is destroyed, blindness results.
Early detection and treatment by the Gailey Eye Clinic physicians are
the keys to preventing optic nerve damage and blindness from glaucoma.
What Causes Glaucoma?
Clear liquid, called the aqueous humor, flows in and out of the eye.
This liquid is not part of the tears on the outer surface of the eye.
You can think of the flow of aqueous fluid as a sink with the faucet turned
on all the time.
If the "drainpipe" gets clogged, water collects in the sink and pressure
builds up. If the drainage area of the eye - called the drainage angle
- is blocked, the fluid pressure within the inner eye may increase, which
can damage the optic nerve.
What are the Different Types of Glaucoma?
Chronic open-angle glaucoma: This is the most common glaucoma.
It occurs as a result of aging. The "drainpipe," or drainage angle of
the eye, becomes less efficient with time, and pressure within the eye
gradually increases.
If this increased pressure results in optic nerve damage, it is known
as chronic open-angle glaucoma. Over 90% of adult glaucoma patients have
this type of glaucoma.
Chronic open-angle glaucoma can damage vision so gradually and painlessly
that you are not aware of trouble until the optic nerve is already badly
damaged.
Angle-closure glaucoma: Sometimes the drainage angle of the eye
may become completely blocked.
It is as though a sheet of paper floating near a drain suddenly drops
over the opening and blocks the flow out of the sink. In the eye, the
iris may act like the sheet of paper closing off the drainage angle.
When eye pressure builds up rapidly, it is called acute angle-closure
glaucoma.
The symptoms include:
- Blurred vision;
- Severe eye pain;
- Headache;
- Rainbow haloes around lights;
- Nausea and vomiting.
If you have any of these symptoms, call the Gailey Eye Clinic general
physicians immediately. Unless he treats acute angle-closure glaucoma
quickly, blindness can result.
A more gradual and painless closing of the angle is called chronic angle-closure
glaucoma. It occurs more frequently in people of African and Asian ancestry.
How is Glaucoma Detected?
Regular eye examinations by the Gailey Eye Clinic general physicians
are the best way to detect glaucoma. He can detect and treat glaucoma.
During a complete and painless examination, the Gailey Eye Clinic physicians
will:
- Measure your intraocular pressure (tonometry);
- Inspect the drainage angle of your eye (gonioscopy);
- Evaluate any optic nerve damage (ophthalmoscopy);
- Test the visual field of each eye (perimetry).
Some of these tests may not be necessary for every person. You may need
to repeat these tests on a regular basis, to determine if glaucoma damage
is increasing over time.
Who is at Risk for Glaucoma?
High pressure alone does not mean that you have glaucoma. The Gailey
Eye Clinic physicians put together many kinds of information to determine
your risk for developing the disease.
The most important risk factors include:
- Age;
- Near-sightedness;
- African ancestry;
- A family history of glaucoma;
- Past injuries to the eyes;
- A history of severe anemia or shock.
The Gailey Eye Clinic physicians will weigh all of these factors before
deciding whether you need treatment for glaucoma, or whether you should
be monitored closely as a glaucoma suspect.
This means your risk of developing glaucoma is higher than normal, and
you need to have regular examinations to detect the early signs of damage
to the optic nerve.
How is Glaucoma Treated?
As a rule, damage caused by glaucoma cannot be reversed. Eye drops, pills
and laser and surgical operations are used to prevent or slow further
damage from occurring.
With any type of glaucoma, periodic examinations are very important to
prevent vision loss. Because glaucoma can worsen without your being aware
of it, your treatment may need to be changed over time.
Medicines
Glaucoma is usually controlled with eye drops taken several times a day,
sometimes in combination with pills. These medications decrease eye pressure,
either by slowing the production of aqueous fluid within the eye or by
improving the flow leaving the drainage angle.
For these medications to work, you must take them regularly and continuously.
It is also important to tell all of your doctors about the eye medications
you are using.
Glaucoma medications can have side effects. You should notify the Gailey
Eye Clinic physicians immediately if you think you may be experiencing
side effects.
Some eye drops may cause:
- A stinging sensation;
- Red eyes;
- Blurred vision;
- Headaches;
- Changes in pulse, heartbeat or breathing.
Pills sometimes cause:
- Tingling of fingers and toes;
- Drowsiness;
- Loss of appetite;
- Bowel irregularities;
- Kidney stones;
- Anemia or easy bleeding.
Laser Surgery
Laser surgery treatments may be effective for different types of glaucoma.
The laser is usually used in one of two ways.
In open-angle glaucoma, the drain itself is treated. The laser is used
to enlarge the drain (trabeculoplasty) to help control eye pressure.
In angle-closure glaucoma, the laser creates a hole in the iris (iridotomy)
to improve the flow of aqueous fluid to the brain.
Operative Surgery
When operative surgery is needed to control glaucoma, the Gailey Eye
Clinic physicians use miniature instruments to create a new drainage channel
for the aqueous fluid to leave the eye. The new channel helps to lower
the pressure.
Through serious complications of modern glaucoma surgery are rare, they
can occur, as with any surgery. Surgery is recommended only if the Gailey
Eye Clinic physicians feel that it is safer to operate than to allow optic
nerve damage to continue.
What is Your Part in Treatment?
Treatment for glaucoma requires a "team" made up of both you and the
Gailey Eye Clinic physicians. He can prescribe treatment for glaucoma,
but only you can make sure you take your eye drops or pills.
Never stop taking or change your medications without first consulting
the Gailey Eye Clinic physicians. Frequent eye examinations and tests
are critical to monitor your eyes for any changes. Remember, it is your
vision, and you must do your part to maintain it.
Loss of Vision Can Be Prevented
Regular medical eye exams may help prevent unnecessary vision loss. You
should have an examination:
Every 3 to 5 years --
- If you are age 39 and over.
Every 1 to 2 years --
- If a family member has glaucoma;
- If you are of African ancestry;
- If you have had a serious eye injury in the past;
- If you are taking steroid medications.
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