Kısaca
Without gravity, tears form a ball around the eye. If astronauts don"t wipe them, vision gets blurry.
Without gravity in space, tears don"t flow down. Surface tension causes them to form a growing water ball around the eye.
This ball blocks vision and causes discomfort. Astronauts must absorb them with towels or tissues.
Sweat behaves the same way - forms a film on skin instead of dripping.
Source: NASA Human Research
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