One of the more common types of glaucoma, open-angle glaucoma is characterized by the gradual loss of peripheral vision. Usually this occurs without any other symptoms. Unfortuatnely, by the time the loss in peripheral vision is noticed, there is already permanent damage.
Acute Angle-Closure Glaucoma
Acute angle-closure glaucoma, also known as narrow-angle glaucoma, is characterized by sudden eye pain, halos around lights, possible headaches, vision loss, neausea and vomiting.
These attaches, as they are sometimes called, can last for a few hours or may be continuous. Either way, these attacks are considered a medical emergency and should be treated by a medical professional as soon as possible.
Normal tension glaucoma is a type of open-angle glaucoma that is characterized by a visual field of vision loss due to optic nerve damage. It is unlikely to experience pain, however damage to the optic nerve is unfortunately not noticed until tunnel vision occurs.