What is Tonometry??

Tonometry is the test to measure intraocular pressure which changes when the balance between production amount and outflow amount of liquid (aqueous humor) inside the eyes is disrupted.

Reference value

The normal range of intraocular pressure is 8 to 20 mmHg, 21 mmHg is considered high, and 7 mmHg is considered low. The average intraocular pressure is around 15 mmHg.

Conditions detected by tonometry

High eye pressure detected by tonometry can be caused by glaucoma and ocular hypertension. Low eye pressure can be retinal detachment and iridocyclitis.