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What is the cause of glaucoma?

The most common form of glaucoma, Primary Open Angle Glaucoma, occurs when the drainage angle of the eye fails to properly drain fluid from the eye. This causes an increase of pressure on the optic nerve and can permanently damage vision. Rarer forms of glaucoma cause damage to the optic nerves in a variety of different ways, but all of them involve damage of the optic nerve.

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