In order to make appearance more attractive, nowadays more and more people choose to wear contact lenses, for it appears to be invisible, and also at the same time can have the function of vision correcting. And there are various options for you to choose from according to the time span. For example, if you buy the contact lenses which you should throw it away in 1 month. That means that exactly from the time you open the bottle of the contact lenses to 1 month later, not means that you wear it for 1 month.