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What is Normal-Tension Glaucoma?

In normal-tension glaucoma, the intraocular pressure (IOP) is not very high, but the optic nerve is still damaged.

Doctors do not know why some people's optic nerves are damaged even though they have almost normal (between 12-22 mm Hg) pressure levels. Those at a higher risk for this type of glaucoma include:

  • people with a family history of normal tension glaucoma,
  • people of Japanese ancestry,
  • people with a history of systemic heart disease such as irregular heart rhythm.

This type of glaucoma is generally detected after an examination of the optic nerve.

The Glaucoma Research Foundation sponsored an international study to help determine what type of treatment is best for this type of glaucoma. Most doctors treat normal tension glaucoma by keeping normal eye pressures as low as possible by using medicines, laser surgery, or filtering surgery.

Read more about normal-tension glaucoma.

Last reviewed on September 06, 2013

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