Normal-Tension Glaucoma: Causes, Symptoms, and Treatment

Normal-Tension Glaucoma: Causes, Symptoms, and Treatment

What is Normal-Tension Glaucoma?

Normal-Tension Glaucoma (NTG), also known as normal pressure or low tension glaucoma, is a form of glaucoma in which the optic nerve starts damaging even when the pressure does not exceed the normal range of 12-22 mm Hg. NTG may lead to peripheral or narrowed vision loss and even permanent blindness. However, with early diagnosis and treatment, it is possible to prevent or stabilize the optic nerve damage.

What causes Normal-Tension Glaucoma?

The cause of normal-tension glaucoma is not known for sure. However, some conditions that can give rise to NTG are discussed below:

  • Atherosclerosis– In this condition, a build-up of fat deposits occurs in arteries and disrupts blood circulation.
  • Raynaud’s phenomenon– This is a problem that causes decreased blood flow in some body areas.
  • Nocturnal hypotension– It is another condition that increases the risk of normal-tension glaucoma and ultimately causes vision loss.

What are the symptoms of Normal-Tension Glaucoma?

Also known as the “silent thief of sight”, NTG doesn’t show significant symptoms in the early stages. :

  • Increased frequency of headaches
  • Migraine
  • Cold hands and feet
  • Low blood pressure
  • Blind spots in vision

What are the risk factors of Normal-Tension Glaucoma?

  • Age: Older patients are at high risk of developing NTG
  • Gender: NTG is more common in women than men
  • Patients with increased central corneal thickness
  • Patients of heart disease
  • Genetic
  • Smoking habits
  • High body mass index

How is Normal-Tension Glaucoma treated?


Anti-glaucoma medications such as latanoprost, bimatoprost, and timolol are found to be effective for normal-tension glaucoma. These medications cure NTG by reducing eye pressure as low as possible. Generally, they are given in the form of eye drops.

Laser Treatments 

Selective laser trabeculoplasty (SLT) is a laser treatment that can help achieve the reduction of intraocular pressure (IOP) in the eye, thereby curing normal-tension glaucoma.


Surgery remains the most proven option to stop or slow down the progression of NTG when medications are unable to do so. The surgeries that are frequently performed for NTG treatment are given below:

Microscopic incisional trabeculectomy 

Trabecular surgery involves the insertion of a tiny device into the eye through a tiny incision under high-power microscopic control. It creates a new pathway for fluid inside the eye to be drained, which, in turn, reduces the eye pressure.

Tube shunt implantation 

A tube shunt, also known as an aqueous shunt, is a drainage implant that creates a new way for aqueous humor to drain from the eye and lower the eye pressure. A tube shunt implantation is recommended when eyedrop medicines and laser treatment aren’t adequate enough to lower the eye pressure.

Minimally Invasive Glaucoma Surgery (MIGS)

MIGS comprise a group of procedures that are usually combined with cataract surgery to achieve lower eye pressure by increasing the outflow of aqueous humor. This minimally invasive technique causes minimum discomfort and leads to more rapid recovery periods.

Clear Vision is one of the best eye clinics in Mumbai. We have a great team of doctors who have extensive experience and highly successful clinical records. So if you are looking for eye surgery, Clear Vision can be the right choice. Visit the Clear Vision website to consult our eye expert online and get prompt treatments for your eye conditions today.


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