Answer:
some sort of water system, (a river/groundwater/purification plant ect.)
Explanation:
Glaucoma is a disease that results in blinding due to damage to the optic nerve. The damage is caused by the build up of eye-fluid, or aqueous humor, in the eye. The increased fluid exerts a pressure on the optic nerve, causing damage. Prostaglandin inhibitors act by increasing aqueous humor outflow, effectively draining the eye fluid and preventing damage.
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