Move monitor further away, set brightness to match ambient light, adjust contrast, http://www.clickonf5.org/hardware/adjust-brightness-contrast...

If you wear glasses, ask optometrist for computer prescription.

Force yourself to blink when using the computer, https://iristech.co/blink-detection/

Take regular breaks: set 20 min timer, look for 20 seconds at an object at least 20 feet away, https://lifehacker.com/5976390/use-the-20-20-20-rule-to-figh...

Avoid flourescent lighting.

Avoid extended sitting: https://glarminy.com/2016/11/29/sedentary-lifestyle-cause-in...

Install flux or redshift on computer to reduce blue light after sunset.