Guide
The 20-20-20 rule: beat eye strain from screens
Your eyes have been doing an isometric hold since 9 am. The 20-20-20 rule is the simplest fix in all of office ergonomics — the only hard part is remembering it.
Why screens tire your eyes
Focusing up close is active work: a ring of muscle inside each eye (the ciliary muscle) contracts to hold near focus, and it holds that contraction for as long as you stare at the screen. Meanwhile your blink rate drops by roughly half when concentrating, drying the eye’s surface. Neither is damaging in itself — but held for an eight-hour shift with no relief, they add up to the familiar end-of-day blur, burn, and headache.
The rule, and why the numbers are what they are
- Every 20 minutes — near-focus fatigue builds quickly; the cycle needs to be short.
- Look 20 feet away — at that distance the focusing muscles fully relax; a window or the far end of the office works.
- For 20 seconds — long enough for the focusing system to actually release and for a few full blinks.
Cost: 20 seconds. Equipment: a window. The entire difficulty of the 20-20-20 rule lives in one word: remember.
Making it automatic
A rule that fires 24 times a workday cannot run on willpower. Two options exist: a dedicated eye-break timer (one more thing to manage) or folding eye breaks into a break system you already keep. Stiff does the latter — its guided routines include near-far focus exercises, timed and illustrated, that appear in your reminder rotation alongside neck tilts and seated twists. Your eyes become one of six body areas under scheduled maintenance, and the streak system supplies the follow-through that a bare timer can’t. That’s the general trick behind every durable desk habit — covered in how to remember to stretch.
Extra relief for heavy screen days
- Blink on purpose a few times each break — it re-wets the surface your concentration dried out.
- Match screen brightness to the room; a screen glowing in a dim room is extra work for your eyes.
- Position the screen slightly below eye level, which relaxes both eyes and neck.
Stiff shares general wellness information, not medical advice. If you have an injury, chronic pain, or a medical condition, check with a healthcare professional before starting a stretching routine, and stop any stretch that causes pain.
Frequently asked questions
What is the 20-20-20 rule?
Every 20 minutes, look at something 20 feet (about 6 metres) away for at least 20 seconds. It’s the standard optometrist-recommended habit for reducing digital eye strain: the distant focus lets the eye’s focusing muscles relax after being locked at screen distance.
Does the 20-20-20 rule actually work?
It targets the right mechanism. Eye strain from screens comes largely from ciliary muscles holding one near-focus position for hours plus a reduced blink rate. Regular distance breaks relax the focusing system and restore blinking. Eye-care organisations widely recommend it as a practical, no-cost habit.
How do I remember to follow the 20-20-20 rule?
Nobody remembers a 20-minute cycle while working — you need an automatic cue. Stiff builds eye breaks into its stretch reminders: near-far focus exercises appear in your rotation alongside neck and back stretches, so your eyes get scheduled maintenance without a separate timer.
What are the symptoms of digital eye strain?
Common signs are dry or watery eyes, blurred vision late in the day, headaches around the eyes or temples, and neck pain from unconsciously craning toward the screen. If symptoms persist despite regular breaks, get an eye exam — sometimes ‘screen fatigue’ is an outdated prescription.
What is a near-far focus exercise?
Hold a thumb at arm’s length, focus on it for a few seconds, then shift focus to something across the room, and alternate for 20–30 seconds. It cycles the eye’s focusing muscles through their range instead of leaving them parked at one distance — Stiff includes it as a guided 20-second exercise.
Learn more
Break reminder app
Movement and eye breaks on one schedule, with nothing to remember.
Read more →Neck & shoulder pain from desk work
Screen-craning strains more than eyes — fix the whole pattern.
Read more →Desk stretches by body area
Eyes are one of six areas Stiff keeps maintained.
Read more →How often should you stretch at work?
The break cadence that covers eyes and body together.
Read more →Download Stiff
Put your eye breaks on autopilot
Stiff rotates near-far focus exercises into your workday reminders, next to your neck and back stretches.
Free to download on iPhone and Android.