If eye fluid pressure increases too much, the fluid pressure may cause glaucoma to occur. The increased fluid pressure (also called intraocular pressure) can damage the optic nerve. Since optic nerve is used to transmit signals to the brain, any optic nerve damages can lead to vision loss.
Glaucoma tends to be genetic, and it may not have early symptoms. Eye injury or severe eye infection might also cause glaucoma. If high eye pressure continues to damage the optic nerve, permanent blindness may eventually occur.
Regular eye exams can help to diagnose glaucoma. If you are over age 40, or your family has a glaucoma history, you should often consult an ophthalmologist (at least every two years).