Blink rate drops by around half in front of a screen. Most dry-eye advice follows from that one fact.
Dry eye complaints have risen alongside screen time, and the mechanism is straightforward: we blink far less when concentrating on a display, so the tear film is not being renewed.
Habits that help
- The 20-20-20 rule. Every 20 minutes, look at something 20 feet away for 20 seconds. This relaxes accommodation and restores blinking.
- Lower the screen. A display below eye level means the lids cover more of the eye surface, reducing evaporation.
- Deliberate full blinks. Incomplete blinks leave the lower cornea exposed. A few slow, complete blinks periodically make a real difference.
- Move the air. A fan or AC vent blowing at the face accelerates tear evaporation more than most people expect.
Where lubricants fit
Tear substitutes supplement the tear film rather than cure the cause. Formulations based on carboxymethyl cellulose add viscosity and stay on the surface longer; sodium hyaluronate holds water well and is often preferred for more persistent dryness. Combination products add glycerine and electrolytes to better match natural tears.
Dryness that persists despite these measures, or that comes with pain, marked redness or blurred vision, should be examined — dry eye has several causes and they are not all treated the same way.
