Clinically, there is no such thing as an eye drop without side effects. In general, most of the eye drops in order to long-term preservation, will add some preservatives, if the long-term use of such eye drops, may cause damage to the eyes, so as to cornea, conjunctiva epithelial damage as well as dry eye and other symptoms. And even if there is no preservative added eye drops, the drug itself may also produce certain side effects. For example, some antibacterial and antiviral eye drops may adversely affect the patient’s periocular environment, and some eye drops containing hormones may also cause the patient’s intraocular pressure to increase, thereby damaging the function of the eye glands and increasing the chance of lesions. Therefore, the use of eye drops must be used correctly under the guidance of a professional doctor, do not blindly use medication, resulting in adverse effects.