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Glaucoma is an insidious disease that can be difficult to detect until a significant amount of vision is lost. Glaucoma is often referred to as the "silent thief", because most individuals with undiagnosed glaucoma do not suffer from any symptoms until they begin to notice a reduction in their peripheral vision.
Technically, glaucoma is due to damage to the optic nerve, sometimes as a result of increased pressure of the aqueous humor, the clear, watery fluid that circulates in the chamber of the eye between the cornea and the lens. But the term glaucoma is now defined as a collection of diseases that causes optic nerve damage. As a result, the diagnosis is no longer solely based on whether a person's Intraocular Pressure (IOL) is elevated or not.
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