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Lighting & glare

window behindyou squint against itwindow to the sidescreen and room match
The fix

Put the brightest light beside you, not behind or in front, and match screen brightness to the room.

Why it happens

Glare and a screen much brighter or darker than its surroundings force the pupil and focusing muscles to keep re-adjusting — extra ocular work you never notice you're doing.

If you ignore it

Poor lighting quietly amplifies every other strain signal, turning a manageable screen day into a headache-prone one.

Wellness & ergonomic guidance, not medical advice.