Use eyewash to wash out the “dirt” in the eyes, this practice is usually unscientific and is not recommended. “Dirt” generally refers to the surface of the eye, eyelashes attached to the fine dust, impurities and secretions, etc., under normal circumstances, tears can play a role in self-cleaning eyes, without the help of eyewash cleaning; if it is lime, hydrochloric acid and other substances splashed into the eye, because of strong corrosive properties, it is recommended to immediately use a large amount of water to clean, then as soon as possible Seek medical attention and further treatment by a professional physician. Most of the eyewash on the market is artificial tears plus cellulose, vitamins made, in addition to adding nutrients, antiseptic and anti-inflammatory ingredients and antiseptic ingredients, for long hours of eye fatigue, dryness can play a good role in alleviating the role of minor eye inflammation also has a certain role in assisting the treatment. But this does not mean that eye wash can be used casually, especially not long-term use. The composition of the eye wash is mainly artificial tears, frequent use will make the eyes too dependent on these products, the normal tear secretion function will be degraded. If the eyes themselves have inflammation, excessive eye wash may also make the original mild keratitis into corneal ulcers, aggravating the condition. In addition, the different kinds of preservative components in the eye wash have different degrees of toxic side effects on the cells of the surface layer of the eye, long-term use may lead to eye flora imbalance, destruction of the surface structure of the eye, etc., the serious cases can be corneal ulcers, perforation and even blindness. It should be noted that people with infectious diseases of the eye, more eye secretions or physical or chemical damage, etc., can be used under the guidance of a doctor to correctly use eyewash, in order to alleviate the symptoms of eye discomfort.