When staring for long times at computer screen our eyes can get dry and suffer form what is called Computer Vision Syndrome (CVS).
To combat and alleviate the symptoms there is the famous 20/20/20 rule that aims at reducing the stress on our eyes caused by focusing for long periods on the same distance.
This is not medical advice. Read more [here](https://en.wikipedia.org/wiki/Computer_vision_syndrome) and [here](https://www.aoa.org/healthy-eyes/eye-and-vision-conditions/computer-vision-syndrome).