Last year my eyes were often red and in the evening.
I used my phone and my computer for six or seven hours a day.
The doctor asked me one question: how often do you look at something away?
Then he gave me a simple : every twenty minutes, look out of the window for twenty seconds.
He also said the room must not be when I read.
I put a on my computer with one word: window.
After a month my eyes were better, and I had a only twice.
Now my phone tells me to stop every twenty minutes.
My little sister has the same , however she often forgets it.