Glaucoma is a leading cause of irreversible blindness in the United States. Glaucoma has no noticeable symptoms in its early stages, and vision loss progresses at such a gradual rate that people affected by the condition are often unaware of it until their sight has already been compromised. Glaucoma is a group of eye diseases that damages the optic nerve. Optic nerve damage is caused by increased pressure from fluid that builds up inside the eye. The amount of pressure that