Definition

Noun: A type of glaucoma characterized by progressive damage to the optic nerve and corresponding visual field loss, despite intraocular pressure (IOP) measurements that consistently fall within the statistically normal range.

Usage

This is a specific medical term used in ophthalmology and healthcare. It describes a condition where the typical primary risk factor for glaucoma—elevated eye pressure—is not present, yet optic nerve damage still occurs. - Diagnosis often requires ruling out other causes of optic neuropathy. - Management may involve lowering intraocular pressure even further below the patient's baseline "normal" level.

Examples

• The patient's diagnosis was normal tension glaucoma, so the doctor recommended a 24-hour eye pressure monitoring test.
• Unlike primary open-angle glaucoma, normal tension glaucoma progresses despite pressures in the normal range.
• Treatment for normal tension glaucoma often focuses on improving ocular blood flow in addition to pressure reduction.

Advanced Usage

• Differential Diagnosis: A key challenge is distinguishing normal tension glaucoma from other conditions that cause optic nerve cupping, such as anterior ischemic optic neuropathy.
• Risk Factors: While IOP is normal, other factors like vascular dysregulation, low blood pressure, and sleep apnea are often considered contributory in normal tension glaucoma.

Variants and Related Words

• NTG: A common acronym for normal tension glaucoma.
• Low-tension glaucoma: An older, less precise synonym for normal tension glaucoma.
• Primary open-angle glaucoma (POAG): The broader category of glaucoma, which includes both high-tension and normal-tension forms.

Synonyms

• Low-tension glaucoma (Note: This term is sometimes used interchangeably but may imply pressures at the lower end of the normal spectrum).

Related Phrases

• Normal-pressure glaucoma: Another phrasing for the same condition.
• Progression of normal tension glaucoma: A common phrase in clinical studies and patient monitoring.

Noun

1. glaucoma that results from damage to the optic nerve although the intraocular pressure is normal