Semi-annual disposable contact lenses are recommended to be used for no more than six months, regardless of the number of times they are used, and should be discarded after six months and not used further. Semi-annual contact lenses should be worn for no more than eight hours a day, and must be removed when sleeping, and soaked in care solution when not in use, and then removed when needed. At the same time, because long-term contact lens wear can easily cause dry eye, conjunctivitis, keratitis, etc., it is important to regulate the use of the operation, and regular eye examinations to ensure eye safety. In addition, patients should also be aware that contact lenses should not be soaked in water because water usually contains certain pathogenic microorganisms that can easily contaminate the lenses, especially the possibility of Echinococcus amoebae, which can cause Echinococcus amoebicus keratitis. The disease is complex and tricky to treat, and is likely to cause significant vision loss in patients. Therefore, patients should strictly follow the requirements for contact lens use and scientific eye care.