Glaucoma is a type of optic neuropathy. It is a disease of the optic nerve, usually caused by elevated intraocular pressure due to inefficient evacuation of the aqueous humour.
There are several types of glaucoma, but all share characteristics, such as a damaged optic nerve causing irreversible loss of vision. This damage can be seen through an excavation at the head of the optic nerve, located at the bottom of the eye.
When the nerve fibers surrounding the optic nerve die, the vision begins to deteriorate. The loss of vision is only noticeable when a large number of fibers have already disappeared. Often, loss of peripheral vision is noticed only after it has progressed towards the central vision. Someone can have glaucoma without being aware of it, which is why it is such a sneaky disease.
You should know that Bellevue clinics have all the latest technologies available to diagnose and monitor glaucoma cases.