The use of eye wash can sometimes help wash out the dirt from the eyes, which generally refers to tiny dust, impurities and secretions attached to the surface of the eyes and eyelashes, but in cases where human tear secretion is normal and there are no eye diseases, there is usually no need to apply eye wash. Eye wash is similar to artificial tears, and contains a certain amount of fiber, vitamins and other nutrients, and can also add antibacterial ingredients and other additives. For people with infectious diseases in the eyes, when there is a lot of eye discharge, and when the eyes are physically or chemically damaged, eye wash can be applied appropriately to play a role in cleaning to reduce the damage to the eyes. Most healthy people do not need to use eye wash because the eyelids, eyelashes and tears of the eyes have the ability to clean themselves and can remove most of the tiny dusts and bacteria that enter the eyes in life. Blind application of eye wash may destroy the self-cleaning function of the human body, and some eye washes are complex in composition and may contain certain preservatives and allergenic ingredients, which may be detrimental to eye health in long-term application. Therefore, it is not recommended to apply eye wash to rinse the eyes in cases of non-special needs.