What eye pressure indicates glaucoma?

Normal eye pressures range from approximately 10 to 21 in our population.  However, an eye pressure above this level does not indicate that an individual has glaucoma. Glaucoma is defined by a characteristic form of damage to the optic nerve in the back of the eye with associated vision loss for which elevated eye pressure is a risk factor.

However, the majority of individuals who have eye pressure over 21 do not develop glaucoma.  In addition, glaucoma can develop when the eye pressure is normal and below 21. Each individual has his own unique susceptibility to develop glaucoma that is related not just to the eye pressure but to other factors that are not well understood.

Continue Learning about Glaucoma Diagnosis

How is glaucoma diagnosed?
Dr. Mehmet Oz, MDDr. Mehmet Oz, MD
A tonometry, the typical initial test for glaucoma, involves measuring intraocular pressure after nu...
More Answers
What is a perimetry (visual field) test for glaucoma?
Laura C. Fine, MDLaura C. Fine, MD
Perimetry, also called a visual field test, is used to diagnose glaucoma (a group of eye diseases th...
More Answers
How often should a person have a screening exam for glaucoma?
Louis B. Cantor, MDLouis B. Cantor, MD
It is important to monitor the eye pressure closely if it is elevated (normal is generally betwe...
More Answers
Is tonometry an effective screening test for glaucoma?
In tonometry, a device (a tonometer, such as the air puff device) measures intraocular pressure ...
More Answers

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.