If you want to use contact lenses, but it is very useful, it is important to take some precautions. Each contact lens has a specific expiration date. It can be 3 months-6 months-1 year. Please check the expiry date before buying. That contact lens can no longer be used after the expiration date. Bottles of a solution with contact lenses are provided or must be purchased. The lens should be thoroughly cleaned with this solution before and after wearing contact lenses. Each time a new solution is added to the lens storage box provided. If contact lenses become irritated , red or watery after wearing contact lenses, the contact lenses should be removed immediately and a doctor should be consulted. Otherwise the corneas of the eyes may be damaged. In the case of power contact lenses, if there is two types of power in both eyes, then it should be kept in the right box while opening or there will be problem in seeing. Usually each lens has a different quality. The quality of these contact lenses will vary depending on the price. You can't use cheap quality products that hurt your eyes while keeping an eye on the price. Learn more about other things