Quick answer: Usually dry eyes, counterintuitively. A dried-out eye surface (you blink far less while focused on a screen) triggers reflex tearing, so dryness and watering go hand in hand. Blue light isn't the cause.
How to stop watery screen eyes
- Blink fully and often, you blink far less at screens
- Use the 20-20-20 rule to give your eyes a reset
- Add humidity and keep fans, vents, and AC off your face
- Use preservative-free lubricating drops
- Cut glare and match screen brightness to the room
When to see a doctor
If watering is constant, painful, or affects your vision despite better habits, see an eye doctor, you may have dry eye disease or a tear-duct issue.
The bottom line: Watery eyes at screens are usually a dryness problem in disguise, you blink less and your eyes over-tear to compensate. Blink, take breaks, add moisture, and use drops, and it settles.