The definition of glaucomais changing rapidly asour understanding of the pathogenesis of damage to the retina and optic nerve improves. However, the disease can still be described generally as an elevation in intraocular pressure (IOP) that is incompatible with normal ocular function. IOP is the result of a balance between production and drainage of aqueous humor. In clinical practice, glaucoma is caused by drainage disturbances, and cases of increased production are not recognized.
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