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The article presets five important things to know about glaucoma. These are the fact that glaucoma is the most common cause of irreversible blindness in the world, that glaucoma is an optic neuropathy that can lead to loss of visual field, that primary open-angle glaucoma leads to loss of vision, that patients need to undergo therapy or surgical interventions to slow the progression of open-angle glaucoma, and that acute angle-glaucoma is a medical emergency.