Safe Eyes

Here is another tool for the same purpose:

sudo apt install safeeyes

Alternatively, you can install it from the PPA:

sudo add-apt-repository ppa:slgobinath/safeeyes

sudo apt-get update

sudo apt-get install safeeyes

Features:

• Short breaks with eye exercises


• Long breaks to change physical position and to warm up


• Strict break for those who are addicted to computer


• Do not disturb when working with fullscreen applications( Eg: Watching movies)


• Disable the keyboard during break


• Notifications before every break


• Support multiple displays


• Pause automatically if the system is idle


• Optional audible alert at the end of breaks


• Multi-language support

For more details https://github.com/slgobinath/SafeEyes