What Is Normal-Tension Glaucoma?

Normal-tension glaucoma (NTG), also known as low-tension glaucoma, is a type of glaucoma in which damage to the optic nerve occurs despite eye pressure being within the normal range. In most cases, normal-tension glaucoma is a chronic, or long-term, condition.

People with NTG may experience:

* Patchy blind spots in their peripheral (side) vision

* Loss of central vision (in advanced cases)

* Blurred vision

* Pain in the eyes

* Headaches

Risk factors for NTG include:

* Age: NTG is more common in people over the age of 60.

* Race: African Americans and Hispanics are at higher risk for NTG than whites.

* Family history: People with a family history of glaucoma are at higher risk for developing NTG.

* Medical conditions: Certain medical conditions, such as diabetes, high blood pressure, and sleep apnea, are linked to an increased risk of NTG.

NTG is diagnosed based on:

* A complete eye exam, including measurement of eye pressure

* Visual field testing to check for blind spots

* Optic nerve imaging to look for damage to the optic nerve

Treatment for NTG may include:

* Eye drops to lower eye pressure

* Laser therapy to decrease fluid production in the eye

* Surgery to improve drainage of fluid from the eye

NTG can be a serious condition, but it can be managed with early diagnosis and treatment.