There are many different types of glaucoma and most share the fact that the pressure within the eye increases to a point where the optic nerve and the blood vessels within the eye undergo irreversible damage. Risk factors include a family history of glaucoma, nearsightness, hardening of the arteries, anemia, diabetes, and being over 35. Since the inside of the eye is designed to receive light, there are fewer nerves that signal pain when the internal pressure rises. In essence, a person may have glaucoma and never realize it. Thus regular eye examinations are the best protection against glaucoma. Early detection and treatments designed to limit the amount of damage to the retina are the primary goals. Treatment may consist of pills, eye drops, and/or depending on severity: surgery may be indicated.If left untreated, glaucoma robs a person of their peripheral vision, leaving tunnel vision. Glaucoma can also leave you blind. Thus regular eye exams are your best protection.