Glaucoma is a group of eye diseases having various causes ultimately associated with a progressive optic nerve damage resulting in a loss of vision function. The majority of persons with glaucoma have increased intraocular pressure ("eye pressure"), however at least one/sixth of patients with glaucoma have eye pressures considered statistically normal. Proper management of glaucoma requires full compliance by the patient. It is one of the leading causes of blindness, especially in the older and African populations. Untreated or inadequately treated glaucoma will progress to vision loss. Glaucoma cannot be prevented but adequate treatment can reduce the rate and extent of added damage.