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Glaucoma is an eye disease that adversely affects the optic nerve. If left untreated glaucoma leads to progressive vision loss and ultimately blindness. It is most common in older people, though it may occur at any age.


Glaucoma is caused from damage to the optic nerve due to abnormally high intraocular pressure in your eye. The optic nerve supplies visual information from your eyes to your brain.

The intraocular pressure increases due to the accumulation of aqueous humor- the fluid that flows throughout the inside of your eye. When this fluid does not properly drain out from your eyes, it builds up and exerts pressure on the optic nerve, leading to nerve damage and vision problems.


The different types of glaucoma include the following:

  • Open-angle Glaucoma: This type is the most common form of glaucoma where the aqueous humor doesn’t circulate freely due to partial blockage in the trabecular meshwork present in the eye. The trabecular meshwork is the tissue through which the aqueous humor drains from the eye.
  • Closed-angle Glaucoma, also called Angle-closure Glaucoma: With this type of glaucoma, a bulge develops in the iris leading to blockage in the drainage angle between the cornea and iris. This hinders the free flow of aqueous humor within the eye causing increased pressure.
  • Normal-tension Glaucoma: This type of glaucoma develops due to damage to the optic nerve despite normal eye pressure. It may be caused due to diminished blood supply to the eye or from an overly sensitive optic nerve.
  • Pigmentary Glaucoma: This type is caused due to development of abnormal pigments in the iris which leads to blockage in the free flow of fluid in the eye causing pressure to build up.
  • Glaucoma in Children: Some children may develop glaucoma at birth or during the first few years of life due to an underlying medical condition or blockage in the flow of the aqueous fluid.

Signs and Symptoms 

The signs and symptoms of glaucoma depend upon its type and cause. 

For open-angle glaucoma, the common signs include:

  • Patches of blind spots in your central or peripheral vision
  • Tunnel vision in the later stages

For angle-closure glaucoma, common signs include:

  • Eye pain
  • Severe headache
  • Blurred vision
  • Redness in the eye
  • Halos around lights
  • Nausea and vomiting


Glaucoma can be diagnosed with a thorough eye examination. You may also undergo any of the following tests:

  • Dilated eye examination and imaging tests to assess for optic nerve damage
  • Visual field test to check for areas of vision loss
  • Tonometry to measure the intraocular pressure
  • Gonioscopy to inspect the drainage angle between the cornea and iris in the front of your eye
  • Pachymetry to measure the corneal thickness


Glaucoma is treated by lowering the intraocular pressure. The choice of treatment depends upon the intensity of your symptoms. The various treatment options include:

  • Eyedrops
  • Oral medicines
  • Laser therapy
  • Surgery such as minimally invasive glaucoma surgery (MIGS) and trabeculectomy
  • Insertion of a drainage tube in your eye to help drain away excess fluid
  • Laser peripheral iridotomy: This procedure is performed to treat acute angle-closure glaucoma. It involves the creation of a tiny opening in your iris using a laser to allow the free flow of aqueous humor. 

Medical marijuana is recommended in the management of this condition as it is shown to alleviate symptoms and improve quality of life.


Glaucoma is a progressive eye disease that cannot be reversed but can be controlled through early diagnosis and regular checkups with your eye doctor. Timely treatment is necessary to help slow or even prevent vision loss. 

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