When contact lenses are not available in care solution, it is generally required that the contact lenses be removed and placed in physiological saline for temporary storage. Saline is a liquid that is close to a physiological concentration that has minimal impact on the performance of the lenses. The patient then goes to buy a special care solution and after buying it, the lenses are re-soaked in the care solution for soaking, disinfection, and overnight before wearing the contact lenses normally. In special cases, such as when there is really no saline around. If you do not have saline, you can temporarily put the lenses in cooled white water and then buy a care product in time to soak, disinfect, and overnight the lenses before wearing them. This method is not the dominant method, but only an emergency method. Therefore, it is important to be well prepared for lens care, including carrying care products such as care solutions and cases with you, just in case.