In glaucoma, the optic nerve is damaged because of high intraocular pressure (IOP). This means that the pressure within the eyes is too much that it presses on parts of the eyes that either directly or indirectly damage the optic nerve. When the optic nerve is damaged, either gradual or acute vision loss occurs. At present, vision loss from glaucoma is irreversible, unless the disease is caught early and preventive surgery is performed. Get your eyes checked at Focus Eye Care & Surgery to ensure you are not at risk, or to take action early if you are.