What is the 20-20-20 rule?

Every 20 minutes of screen use, look at an object 20 feet (6 metres) away for at least 20 seconds. This allows the ciliary muscles controlling eye focus to fully relax, preventing cumulative eye strain.

Does the 20-20-20 rule actually work?

Yes. Studies by Portello et al. (2012, Optometry and Vision Science) confirm that regular breaks reduce digital eye strain symptoms including dry eyes, headaches and blurred vision in computer users.

Eye Strain Timer

20-20-20 rule · Protect your eyes from screen fatigue

minutes of screen time

feet away (≈ 6 metres)

seconds of looking

Screen time

20:00

Focus on your work

Breaks taken

Session min

The 20-20-20 Rule for Eye Health

The 20-20-20 rule was developed by optometrist Dr. Jeff Anshel as a simple, evidence-informed protocol for reducing computer vision syndrome (CVS) — also called digital eye strain. It affects an estimated 50-90% of people who work at screens for more than 2 hours per day.

Symptoms of digital eye strain include dry eyes, headaches, blurred vision, and neck and shoulder pain. The primary mechanism is reduced blink rate: we blink 15-20 times per minute normally, but only 5-7 times per minute when focused on screens. Reduced blinking means reduced tear film refresh, leading to surface dryness and inflammation.

The 20-foot distance engages your eyes' far-focus muscles (the ciliary muscles), giving the near-focus muscles that have been contracting to read the screen a chance to relax. Twenty seconds is the minimum time required for the ciliary muscle to fully release. Combined with conscious blinking during this time, the break significantly reduces cumulative strain.

Beyond the 20-20-20 Rule

While the 20-20-20 rule is the minimum standard, additional habits significantly reduce eye strain. Adjust your screen brightness to match ambient light — a screen that is brighter than your surroundings forces constant pupil adjustment. Position your screen 50–70cm from your eyes, with the top of the screen at or slightly below eye level to reduce upward gaze (which increases blink rate and dryness).

Blink consciously during your 20-second breaks — 5 slow, complete blinks restores the tear film lipid layer. If you wear glasses, ensure your prescription is current; working through uncorrected vision forces the ciliary muscles to over-accommodate, dramatically accelerating fatigue.

Wellness focus → Focus breathing → Stress check →

Frequently Asked Questions

What counts as 20 feet (6 metres)?

A window view, the far end of a room, or any object clearly more than 6 metres away. The exact distance matters less than the optical principle: at 6 metres, your eyes are in near-parallel focus — essentially the same state as looking at infinity. A distant wall, a tree outside, or a building across the street all work perfectly.

Should I blink during the 20-second break?

Yes — blink 5-10 times slowly and completely during each break. A complete blink (upper lid touching lower lid) refreshes the tear film lipid layer, which reduces dry eye symptoms more effectively than the distance change alone.

Is the 20-20-20 rule enough for heavy computer users?

For moderate users (4-6 hours), yes. For heavy users (8+ hours), combine 20-20-20 with blue light filtering glasses, artificial tears if needed, and a 5-10 minute break away from all screens every 90 minutes. The Wellness Focus timer on this site builds these longer breaks into your workflow automatically.