Test Overview Gonioscopy is an eye examination to look at the front part of your eye (anterior chamber) between the cornea and the iris
Gonioscopy is a painless examination to see whether the area where fluid drains out of your eye (called the drainage angle glaucoma
Gonioscopy is done if your doctor thinks you should be checked for glaucoma. Glaucoma is an eye disease that can cause blindness by damaging the optic nerve
Why It Is Done
Gonioscopy is done to:
Look at the front of the eye See if the drainage angle of the eye is closed or nearly closed. This helps your doctor see which type of glaucoma you have. Gonioscopy can also find scarring or other damage to the drainage angle. Treat glaucoma. During gonioscopy, laser Check for birth defects that may cause glaucoma. How To Prepare
If you wear contact lenses, remove them before this test and do not put them back in for 1 hour after the test or until the medicine used to numb your eye wears off.
If your eyes might be dilated during your examination, your doctor may suggest that you arrange for someone to drive you home after the test.
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How It Is Done
Gonioscopy is usually done by a doctor who treats eye problems (ophthalmologist).
Eyedrops are used to numb your eye so that you will not feel the lens touching your eye during this painless examination.
Gonioscopy is usually done in your doctor's office. During gonioscopy, you may be asked to lie down or to sit in a chair. A microscope (slit lamp) is used to look inside your eye. If you sit, you will place your chin on a chin rest and your forehead against a support bar and look straight ahead. A special lens is placed lightly on the front of your eye, and a narrow beam of bright light is pointed into your eye. Your doctor looks through the slit lamp at the width of the drainage angle.
The examination takes less than 5 minutes.
How It Feels
Gonioscopy does not usually cause any discomfort. The eyedrops used to numb your eye may burn a little. You may find it hard to keep from blinking during the test.
Risks
If your pupils were dilated, your vision may be blurred for several hours after the test. You should not rub your eyes for 20 minutes after the test, or until the medicine wears off.
There is also a very small risk of an eye infection or an allergic reaction
Results
Gonioscopy results Normal:
The drainage angle appears normal, is wide open, and is not blocked.
Abnormal:
The drainage angle looks narrow, is a slit, or is closed. This means that the angle is partially or completely blocked, or there's a risk that the angle will close in the future.
A partially or completely blocked drainage angle may mean that you have closed-angle glaucoma
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Current as of: July 31, 2024
