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405 North Canton Center
Canton, Michigan 48187
Emergency Phone: (734) 667-4704

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A common question asked during the eye exam is, “When is the puff coming?”  

Patients are referring to air-puff or non-contact tonometry. Tonometry is the procedure used to measure eye pressure, and this is important to diagnose and monitor glaucoma.

In non-contact tonometry, a puff of air is used to measure the pressure inside the eye.  The benefit of this test is there is no actual contact to the eye, but the air puff is sometimes very startling for patients. Most people hate that test and it isn’t the most accurate way to measure your eye pressure.

Some doctors don’t even use the air-puff test. Instead, they place a yellow drop that consists of a numbing medicine and then shine a blue light on the eye. This is done in front of the slit lamp and a small tip gently touches the eye to measure the eye pressure. This procedure is called Goldmann tonometry and is considered the gold standard for measuring eye pressure.  

Another method for checking eye pressure is the Tonopen. This is a portable, hand-held instrument that is useful when patients can’t sit in front of the slit lamp to have their eye pressure checked. The Tonopen also requires a numbing drop to be placed in the eye, and the tip gently touches the eye.

A common question related to tonometry is “what normal eye pressure?”

Normal eye pressure ranges from 10-21 mm Hg. Eye pressure doesn't have any relationship to blood pressure. Many times, people are surprised that their eye pressure is high, but they have normal blood pressure. In general, there is no diet or exercise that will significantly affect eye pressure. It is therefore important to have your eye pressure checked regularly because there are usually no symptoms of high eye pressure until it has affected your vision.

Article contributed by Dr. Jane Pan

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Welcome to Eye Definition

Our optometric practice proudly serves Canton, MI and the surrounding Westland, Plymouth, Northville, Belleville, Livonia, Ann Arbor, and Ypsilanti communities with quality service and a friendly staff. Dr. Jay Lizyness takes great pride in offering every patient the absolute best in vision care, whether through fitting them with eyeglasses or contact lenses, diagnosing cataracts, glaucoma, and other eye diseases, or recommending LASIK and other eye surgery procedures.

Our expert optometrist and experienced staff will take the time to answer all of your questions, explain treatment options, and provide the highest quality eye health treatments available.

Built on the foundation of patient convenience and satisfaction, Eye Definition serves all of your family’s eye care needs under one roof. Come visit our modern facility and friendly doctor and staff! Call our office at (734) 667-4704 to schedule and exam or book your appointment online.

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