Set alarm every 2 hour display on (Mac) I intend to save my eyes healthy. So, i want to set alarm every 2 hour computer i used. I have tried to set on calender and clock, but i can't find the way.
if you have macOS Catalina, in Reminders App, you can create a reminder that alerts you every 2 hours, for example.  

for another, you have free apps in Mac AppStore like for https://apps.apple.com/us/app/time-out-break-reminders/id402592703?mt=12