“The two main types of glaucoma are Open-Angle and Angle-Closure. But did you know that there are at least eight additional types of glaucoma? Most other types of glaucoma are variations of the open-angle or angle-closure types. These glaucoma types can occur in one or both eyes. What most types of glaucoma have in common is an increase of intraocular pressure (IOP), or pressure inside the eye.”

Glaucoma Research Foundation (https://glaucoma.org/learn-about-glaucoma/types-of-glaucoma/)