How To Prepare
Tell your doctor if you or someone in
your family has glaucoma or risk factors for glaucoma.
If you wear
contact lenses, remove them before the test. Do not put your contacts back in
for 2 hours after the test. Bring your eyeglasses to wear after the test until
you can wear your contact lenses.
Loosen or remove any tight
clothing around your neck. Pressure on the veins in your neck can increase the
pressure inside your eyes. Stay relaxed.
How It Is Done
Tonometry takes only a few minutes to
Applanation (Goldmann) method
This type of
tonometry is done by an ophthalmologist or an optometrist. Your doctor will use
eyedrops to numb the surface of your eyes so that you will not feel the
tonometer during the test. A strip of paper containing a dye (fluorescein) will
be touched to your eye, or eyedrops containing the dye will be applied. The dye
makes it easier for your doctor to see your cornea.
You will rest
your chin on a padded support and stare straight into the microscope (slit
lamp). Your doctor sits in front of you and shines a bright light into your
eye. Your doctor gently touches the tonometer probe to your eye. Your doctor
checks the tension dial on the tonometer that measures the IOP of your
Do not rub your eyes for 30 minutes until the numbing
medicine has worn off.
Electronic indentation method
can be done by a technician, an optometrist, an ophthalmologist, or a family
medicine doctor. Your doctor will use eyedrops to numb the surface of your eyes
so that you will not feel the tonometer during the test.
stare straight ahead, or sometimes look down. Your doctor gently
touches the tonometer probe to your eye. Several readings will be taken on each
eye. You will hear a clicking sound each time a reading is obtained.
After enough accurate readings have been obtained, a beep will sound, and the averaged IOP
measurement will appear on the instrument's display panel.