Dry Eye From Screens: Computer Vision Syndrome

What screens do to the tear film

Every complete blink spreads a fresh layer of tears, with oil from the meibomian glands, across the eye. Concentration suppresses blinking, and screens, which sit higher in the visual field than a book, widen the eyes and expose more surface to evaporation. Half blinks, in which the lids do not meet, fail to express the glands and leave the lower cornea uncovered, which is exactly where dryness damage is usually found in screen workers. Air conditioning and low humidity in offices make it worse.

Symptoms

Burning, grittiness and redness that build through the working day, vision that blurs and sharpens with a blink, tired or heavy eyes, headaches from sustained focus, and difficulty refocusing at distance after long sessions. Symptoms ease on weekends and holidays and return with work, which is the clue.

Habits that help

• The 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds, and blink fully several times
• Deliberate complete blinks: a few times an hour, close the eyes fully and gently squeeze, to express the glands
• Position the screen slightly below eye level so the lids cover more of the eye
• Increase humidity and direct air conditioning vents away from your face
• Preservative-free lubricating drops before symptoms start, not after
• Warm compresses in the evening to keep the glands flowing
• Correct any uncorrected prescription, including a small astigmatism, which increases strain

When habits are not enough

If symptoms persist despite these, the glands may already be blocked or the surface inflamed, and a dry eye evaluation measures both. Meibomian gland treatments restore the oil layer; anti-inflammatory drops settle the surface; and the habits above then maintain the result. Screen workers who also wear contact lenses often find lenses become the limiting factor, and vision correction surgery is worth discussing.