Tears do not fulfill their function in space. It is the expeller of the Eliminations of Eyes. But in space because the tears did not fall. The liquid builds up and stings the eyes. Tears will not escape by forming a smaller ball. Astronaut Andrew Feustel had reported a mishap about it. In 2001, while walking in the space of 7 hours, he received anti-fog liquid in the eye. Tears were never forced to stay in place of the foam inside the helmet for a long time to clear the liquid accumulated in her eyes.
For the same reasons, there is no traditional shower in the weightless environment. Astronauts use a spray nozzle and washcloths to clean themselves.