What is Glaucoma ?
Glaucoma is a disease of the major nerve of vision, called the optic nerve. The optic nerve receives light from the retina and transmits impulses to the brain that we perceive as vision. Glaucoma is characterized by a particular pattern of progressive damage to the optic nerve that generally begins with a subtle loss of side vision (peripheral vision). If glaucoma is not diagnosed and treated, it can progress to loss of central vision and blindness.
Glaucoma is usually, but not always, associated with elevated
pressure in the eye (intraocular
pressure). Generally, it is this elevated eye pressure that leads to damage
of the eye (optic) nerve. In some cases, glaucoma may occur in the presence of
normal eye pressure. This form of glaucoma is believed to be caused by poor
regulation of blood flow to the optic nerve.