Tonometry

Tonometry may be done:

• As part of a regular eye examination to check for increased intraocular pressure (IOP), which increases your risk of glaucoma.
• To check the treatment for glaucoma. Tonometry can be used to see if medicine is keeping your IOP below a certain target pressure set by your doctor.

Tonometry takes only a few minutes to do.

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 eye.

Do not rub your eyes for 30 minutes until the numbing medicine has worn off.

Electronic indentation method

Electronic tonometry 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.

You will 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.

Do not rub your eyes for 30 minutes until the numbing medicine has worn off.

Noncontact (or air-puff) method

This type of tonometry is done by an ophthalmologist or an optometrist. You do not need drops to numb your eye for this method.

You will rest your chin on a padded support and stare straight into the machine. A brief puff of air is blown at your eye. You will hear the puffing sound and feel a coolness or mild pressure on your eye. The tonometer records the intraocular pressure (IOP) from the change in the light reflected off the cornea as it is indented by the air puff. The test may be done several times for each eye.

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.

Normal eye pressure is different for each person and is usually higher just after you wake up. The pressure inside the eye, called intraocular pressure (IOP), changes more in people who have glaucoma. Women usually have a higher IOP than men, and IOP normally gets higher as you get older.

High values

• A high IOP may mean that you have glaucoma or that you are at high risk for developing glaucoma. People who have ongoing pressures above 27 mm Hg usually develop glaucoma unless the pressure is lowered with medicines.
• People who have an ongoing IOP higher than 21 mm Hg but do not have optic nerve damage have a condition called ocular hypertension. These people may be at risk for developing glaucoma over time.