Quick answer: Because your screen is brighter than the room around it, plus glare. Your eyes squint to cut down the excess light. Match your screen's brightness to your surroundings and reduce glare, and the squinting (and the fatigue it causes) eases.
How to stop squinting
- Turn screen brightness down to match the room (use auto-brightness)
- Never run a bright screen in a dark room, add soft ambient light
- Cut glare, position the screen away from windows and overhead lights
- Increase text size so you're not straining to read
- A tinted lens softens overall brightness for extra comfort
The bottom line: Squinting at bright screens means the display is brighter than your surroundings. Match the brightness, add ambient light, cut glare, and bump up text size, and a tinted lens can soften what's left.
