What is glaucoma?
Glaucoma is a leading cause of blindness throughout the world. Its exact cause is not known.
Glaucoma refers to a group of eye diseases that have common features including raised intraocular pressure, damage to the optic nerve, and sight loss.
There are several types of glaucoma, including primary open-angle, closed-angle, secondary, congenital, and normal tension.
The most common is primary open-angle glaucoma.