Glaucoma – Glaucoma describes eye disorders that involve damage to the optic nerve, which sends visual signals from your eye to your brain.   This loss of nerve tissue can result in loss of vision.   Primary open-angle glaucoma is one of the most common disorders.   It results from an increased pressure inside the eye, which can cause damage to the optic nerve.   A damaged nerve can lead to vision loss or even blindness.   This pressure can build slowly and be difficult to detect in everyday life.   It may start by affecting only your peripheral vision.