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Alternative names
Intraocular pressure (IOP) measurement; Glaucoma test
Definition
Tonometry is a test to measure the pressure inside your eyes. The test is used to screen for glaucoma.
How the test is performed
The noncontact (air puff) method is employed to test for glaucoma. In this method, your chin rests on a padded stand. You stare straight into the examining device. The eye doctor shines a bright light into your eye to properly line up the instrument, and then delivers a brief puff of air at your eye. The machine measures eye pressure by looking at how the light reflections change as the air hits the eye.
How to prepare for the test
Remove contact lenses before the examination.
Inform the health care provider if you have corneal ulcers and infections, an eye infection, if you are taking any drugs, or if you have a history of glaucoma in your family.
How the test will feel
You may feel mild pressure on your eye.
Why the test is performed
People over age 40, especially African Americans, are at the highest risk for developing glaucoma. Regular eye exams can help detect glaucoma early, when it can usually be treated.
Normal Values
The eye pressure is within the normal range.
What abnormal results mean
Glaucoma may be detected.
Additional conditions under which the test may be performed:
- Hyphema
- Trauma to the eye or head
- Before and after eye surgery
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