Glaucoma:  often called the "silent thief of sight", is a group of eye disorders that typically cause no pain and produce no symptoms that can lead to progressive damage to the optic nerve, which characterized by loss of nerve in the tissue resulting in loss of vision.  The optic nerve is a package of about one million individual nerve fibers that transmits the visual signals from the eye to the brain.  Advanced glaucoma may even cause blindness.  Everyone with high eye pressure WILL NOT develop glaucoma, and many people with normal eye pressure CAN  develop glaucoma.  When the pressure inside an eye is too high for any particular optic nerve, whatever the pressure measurement may be, glaucoma will develop.  The most common form of glaucoma, Primary Open-Angle Glaucoma is associated with an increase in the fluid pressure inside the eye.  The pressure increase may cause progressive damage to the optic nerve and loss of nerve fibers.  Vision loss may result