It is reported that 4 million Americans and 65 people worldwide have a condition known as glaucoma, a group of diseases that affect the eye and results in a gradual loss of vision. Glaucoma is the second leading cause of blindness.

Causes of Glaucoma
According to the Mayo Clinic, abnormally high pressure inside your eye, or intraocular pressure, is usually what causes the damage to the optic nerve, causing vision loss (glaucoma).

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A older (70s) relative of mine suffered acute glaucoma recently and got treated immediately. She then got another attack a week later and had to go to the hospital.

This is a definition I got from a webiste (http://www.glaucoma.org.au/whatis.htm)