As per Alcon's suggestions, you are advised to change the cases of your contact lenses whenever you change a bottle of solution. Contact lens cases play an important role in keeping your lenses clean and working in perfect condition. Not replacing the contact lens cases on time can cause several problems and it is very important to take good care of your lenses and your eyes. But, that does not mean you should get worried and frustrated. You can buy plenty of replacement cases well in advance. Ensure that you never run out of replacement cases for your contact lenses whenever you get a new bottle of solution.