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Glaucoma - How are my eyes affected by glaucoma?

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Glaucoma is a disease of the optic nerve, which transmits the images you see from the eye to the brain. The optic nerve is made up of many nerve fibers (like an electric cable with its numerous wires). Glaucoma damages nerve fibers, which can cause blind spots and vision loss.

Glaucoma has to do with the pressure inside the eye, known as intraocular pressure (IOP). When the aqueous humor (a clear liquid that normally flows in and out of the eye) cannot drain properly, pressure builds up in the eye. The resulting increase in IOP can damage the optic nerve and lead to vision loss.

Because it has no noticeable symptoms, glaucoma is a difficult disease to detect.  Early damage in this disease is usually confined to the peripheral visual field which can go unnoticed until the central vision is affected.  Once areas of the visual field are lost, there is no way to recover them.