What is Glaucoma?

Glaucoma is a disease that damages optic nerve of the eye. It usually occurs when the pressure inside the eye increases.

It is the leading cause of irreversible blindness worldwide, but blindness from glaucoma can often be prevented with early treatment.

What causes Glaucoma?

Eye constantly produces a liquid called aqueous humor. As new aqueous flows into eye, the same amount should drain out. The fluid drains out through an area called drainage angle. If the drainage angle is not working properly, fluid starts accumulating inside the eye and pressure inside the eye raises. Raise in intraocular pressure leads to damage of optic nerve.

Types of Glaucoma:

There are two major types of glaucoma.

  1. Primary open angle glaucoma
  2. Primary angle closure glaucoma


  1. Open Angle Glaucoma: Most common type of glaucoma. In this pressure inside the eye raises due to clogging of the drainage angle.
  • There are no warning signs or obvious symptoms in the early stages.
  • As the disease progresses, patients peripheral vision will be affected.
  • Until the damage is quite severe, people do not notice any change in their vision. This is why glaucoma is called the “silent thief of sight”.
  • By regular eye checkups only glaucoma can be diagnosed in early stages before the vision is lost.
  1. Angle Closure Glaucoma:
  • It occurs when drainage angle of eye is blocked suddenly resulting in sudden rise of IOP.
  • Presents with sudden blurring of vision, severe eye pain, headache, nausea, vomiting, redness & rainbow colored rings (Colored Halos).