Deep research and expert guides on maintaining your visual health.
Hydration Habits: Water-Drinking Spikes and How to Sip Safely Staying properly hydrated is crucial for overall health – but surprisingly, the way we drink water can affect our eyes. In ophthalmology, a water-drinking test (WDT) has long been used to provoke and study intraocular pressure (IOP) changes in glaucoma patients. In this test, patients drink a large volume of water quickly (often ~1 lit...
A water drinking test is a controlled procedure used to see how a person's body handles a specific amount of water. It is usually done under medical supervision to measure how the kidneys and certain hormones concentrate or dilute urine after drinking. During the test someone may be asked to drink a measured volume of water and then provide urine samples or have blood checks at specific times. The results can help doctors understand conditions that affect fluid balance, such as problems with salt regulation, certain kidney issues, or disorders that change how the body responds to fluid. The test can show whether the body is holding too much water, losing it too fast, or not responding properly to signals that control fluid levels. It is not a self-administered check because drinking large quantities of water too quickly can be risky for some people. Possible risks include low blood salt (hyponatremia), nausea, or swelling if the test is done without proper monitoring or in people with heart or kidney problems. Doctors will consider medical history, current medicines, and symptoms before recommending the test and will give clear instructions about preparation. When done correctly, the water drinking test provides useful information that guides treatment to protect hydration and overall health.
