What to Expect at an Eye Examination

Step 7 - Tonometry, the "Puff of Air" - Testing for Glaucoma

Up to five million Americans have glaucoma, but about half of those people don't even know it because glaucoma has no symptoms.

That's why the "puff-of-air" test is so important. After placing your chin on the rest, you will look at a light inside the machine. The doctor will line the machine up and puff a small burst of air at your open eye. It is completely painless and does not come in contact with the eye. Based on your eye's resistance to the puff of air, the machine calculates your intraocular pressure and, in turn, the likelihood of glaucoma.


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