The Lens Timer is a free, convenient and simple app for those who use contact lenses and need to keep track of the time they need to wear them. It helps you remember to change your contact lens every day, even when you're not wearing them.

It works as follows:

It sends you a notification each day at the same time. It will remind you that you need to change your contact lens. You can choose to change your lens the same day or to schedule it for a later time. It also allows you to set an order for your next set of contact lenses.