Osmotic agents

In the middle of a very high pressure emergency, doctors sometimes give medicine that is designed to lower the eye pressure quickly to make other treatment possible. This means drinking a solution containing the drug or receiving it as an infusion into a vein. In both cases, the way it works is to send a big dose of sugar-like chemical through the blood stream. Because the blood is temporarily lower in water content compared to the eye, water is sucked out of the eye into the blood vessels in the choroid and retina. These agents are called glycerol and mannitol. They can only be given under careful observation in a medical facility.

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