Contact eye soaking solution can be changed every time you use it, not once every few days. The main purpose of the soaking solution is to disinfect glasses and remove contact lens proteins, so if it is left for a long time, it will be contaminated by the surrounding air, environment or microorganisms. If you use the soaking solution to soak your glasses, it may cause microbial infection or change the nature of your glasses, thus affecting the ability to remove contact lens proteins. Therefore, it is recommended that contact lens soaking be done immediately, that is, each time a new soaking solution is used to soak the contact lens. And glasses should be treated just as strictly, and must be removed for cleaning and soaking for 4-6 hours a day to reduce the possibility of infection.