Tonometry

Tonometry is a diagnostic test that measures the pressure inside your eye, which is called intraocular pressure (IOP). This measurement can help your doctor determine whether you are at risk of developing glaucoma, a group of eye conditions that can cause blindness by damaging the optic nerve.

Types of Tonometry

There are several types of tonometry tests, including:

• Applanation Tonometry: This test measures the force required to flatten a certain portion of the cornea. A numbing drop is usually placed in your eye for this test.

• Non-contact Tonometry: This method uses a puff of air to estimate the pressure in your eye. No numbing drop is required with this method.

• Pneumatonometry: This test is often used for patients with corneal scarring, corneal edema, or an irregular corneal surface. It uses a small probe containing a pressure sensor to measure IOP.

• Schiotz Tonometry: This method uses a small instrument called a tonometer that is placed on the surface of the eye. This type of tonometry is not used as frequently due to less accurate results.

Procedure

During tonometry, numbing eye drops are applied to your eye. Then, the doctor or a trained technician uses a device called a tonometer to measure the intraocular pressure. The tonometer can either touch the cornea directly, or a puff of air can be directed onto your eye.

Risks and Complications

Tonometry is a safe procedure with minimal risks. Some people may feel a little discomfort during the test, especially when the tonometer comes into contact with the eye, but the discomfort should be minimal and short-lived. The most common complication is a temporary blurring of vision.

See Also

• Glaucoma
• Intraocular Pressure
• Ophthalmology

Tonometry Resources
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