Contact Lens Tracker

This application is a quick and efficient way to keep track of your uses of reusable contact lenses.
By using this application you will be able to share your lens usage information with your optician for future prescriptions to ensure you're purchasing the most appropriate type of contact lenses at the best price. Some reusables also recommend changing packets more frequently based on the number of uses so this application will help keep track of this.
To use this application simply press the 'Open Packet' button when you start a new set of reusables and specify the change/expiry number of days for the pack (From 1 to 366 days). Once a pack is opened you can press the '+1' button to increment your count.
There is a history tab to see when packets were opened and how many times that packet was used (along with dates of usages).
The application has been designed to be opened and closed quickly and with a large font on the main screen to help readability without lenses.
Any suggestions for additional enhancements welcomed!