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Tears or tears, tears, are the fluids secreted by the lacrimal glands outside the eyes. The raw material of the tear is the water in the blood, which is secreted by the lacrimal gland, passes through and moisturizes the surface of the eyeball, then enters the nasolacrimal duct and flows into the nasal cavity to enter the throat. It not only moisturizes the cornea, but also allows the eyeball to lubricate for rotation. It also protects the eyes from bacterial infections and filters some of the UV rays. Under normal conditions, its daily secretion is about two to three milliliters, and it is invisible from the appearance due to the small amount. Tears do not fully indicate changes in mood. When a foreign matter such as dust falls into our eyes, a lot of tears are generated and the foreign matter is washed out.