Break Schedule
The main goal of EyesTrain was to help you follow the 20-20-20 rule, but you can of course do much more than that.
In Preferences -> Breaks you can add as many different breaks as you want by clicking "Add new break".
There are two different kinds of breaks which are determined by the "Trigger":
Interval
This is the default break time and it's similar to a kitchen timer, except it's repeating. For example the default 20-20-20 break will have an interval of 20 minutes.
It is possible to add multiple interval breaks. A good example of this could be when you want to add short breaks to give your eyes some rest, but you also want a longer break every now and then to get up and move.
You could also implement the Pomodoro method using interval breaks. With the pomodoro technique you take 5 minute breaks every 25 minutes, and then take a longer 15-30 minute break every 2 hours.
Fixed Time
Fixed time breaks are more similar to an alarm and always occur on a specific time of the day. These can be useful if you want to remind yourself to take a lunch break on time or maybe for doing a specific non-screen chore.
It is possible to have different interval breaks as well as fixed time breaks.