Glaucoma is a group of diseases that can damage your eye’s optic nerve and result in vision loss and blindness. Glaucoma occurs when the normal fluid pressure inside your eye slowly rises. However, recent findings now show that glaucoma can occur with normal eye pressure. With early treatment, you can often protect your eyes against serious vision loss.
There are two major categories of glaucoma – open angle and closed angle. Open angle is a chronic condition that progresses slowly over a long period of time without the person noticing vision loss until the disease is very advanced. Angle closure can appear suddenly and is painful. Visual loss can progress quickly; however, the pain and discomfort lead patients to seek medical attention before permanent damage occurs.
Source: Centers for Disease Control and Prevention, CDC.gov