Visionsource
FacebookYoutubeGoogleFlickr

Text for an Appointment
or call (214) 865-6266

Pay Online

Why Do You Have to Touch My Eye or Puff It with Air?


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 for diagnosing and monitoring 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 with 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

Office Details

  • Office Interior

    6851 Virginia Parkway,
    Suite #101
    McKinney, TX 75071-0990
    Phone: (214) 865-6266

    Map
    Office Hours
    Mon, Wed, Fri: 8:00am - 5:00pm
    Tue, Thur: 7:00am - 7:00pm

    2019 Best Of Logo long

Latest Vision News

What to Know Before Your First Eye Injection

A common in-office procedure is an eye injection for treatment of various eye conditions, such as wet macular degeneration, diabetic retinopathy, or vein occlusion.  

It is normal to be anxious prior to your first eye injection but knowing...

Read more...