Eye Strain from Computer Screens
Hours in front of a computer screen causes dry eyes, headaches, and blurred vision. This timer automates the 20-20-20 rule to prevent it.
About this timer: Eye Strain from Computer Screens
What is digital eye strain?
Digital eye strain, also called Computer Vision Syndrome, is a group of eye and vision problems caused by prolonged screen use. Symptoms include dry or watery eyes, blurred vision, headaches, difficulty focusing at distance after screen work, and neck or shoulder pain. It affects an estimated 50% or more of computer workers.
Why do computer screens cause eye strain?
Three main reasons. First, you blink significantly less when looking at screens, which dries out your eyes. Second, your ciliary muscles (the tiny muscles that focus your lens) get locked in a near-focus position, causing fatigue. Third, screen glare, poor contrast, and small text force your eyes to work harder than they would with printed material.
How does the 20-20-20 rule help?
By shifting your focus to a distant object for 20 seconds, you give your ciliary muscles a chance to relax and return to their resting state. The 20-second duration is enough for full muscle relaxation. And the act of looking away from the screen naturally triggers blinking, which re-moisturizes your eyes.
What else can I do to reduce screen-related eye strain?
Position your screen 20–26 inches from your eyes (arm's length). Adjust brightness to match your environment. Increase text size so you're not squinting. Reduce overhead glare on your screen. Use artificial tears if your eyes feel dry. And use this timer to make sure you actually take breaks — knowing the rule is not the same as following it.