Didn't wear contacts today? forEyes keeps track of that too and adjusts the expiration date for your lenses.
Add the forEyes widget to your home screen for a quick glance view of how many days your contacts have left.
Note to users asking for independent eye tracking: We too want this feature. But we also want it to be done correctly. We are currently working on ways to implement this while keeping the interface clean and simple to use. We hope to release an update with this feature very soon.