Quick answer: A screen that's brighter than its surroundings, plus glare, forces your eyes to work harder and squint, which leads to strain and discomfort. The fix is simple: match your screen's brightness to the room and cut glare.
How to fix it
- Lower brightness to match the room (use auto-brightness)
- Add soft ambient light, never a bright screen in a dark room
- Cut glare and reflections off the screen
- Raise text size and use the 20-20-20 rule
- A tinted lens softens overall brightness for comfort
The blue light angle
It's mostly brightness and glare, not blue light, that makes screens hurt during the day. Blue light matters more at night, for sleep. So fix brightness for daytime comfort, and cut blue light in the evening.
The bottom line: Bright screens hurt because they out-shine the room and create glare, making your eyes squint and strain. Match brightness, add ambient light, cut glare, and take breaks, and a tinted lens helps soften the rest.
