A simple screen-break habit: every 20 minutes, look at something around
20 feet away for at least 20 seconds.
Published 7 September 2026 ยท 20-20-20 Vision
If you spend hours at a computer, you may recognise the familiar combination
of tired or dry-feeling eyes, blurred vision, difficulty refocusing or a
headache at the end of a long screen session.
The 20-20-20 rule is a simple reminder designed to interrupt
prolonged close-up screen use.
The 20-20-20 rule
Every 20 minutes, look at something around 20 feet (about 6 metres) away
for at least 20 seconds.
That is the whole rule. It is deliberately simple enough to remember
while you are working.
How does the 20-20-20 rule work?
You do not need to leave your desk. Looking through a window, down a corridor
or across a large room is enough to shift your focus away from a nearby screen.
The purpose is not that 20 feet is a magic distance. It is simply far enough
for most people to stop doing sustained close-up viewing for a short period.
20
minutes
Use it as a memorable prompt to interrupt a long stretch of close-up screen work.
20
feet away
Look through a window, down a corridor or across a room - roughly 6 metres.
20
seconds
Give your eyes a short break from sustained near viewing before returning to the screen.
Long, uninterrupted periods of close-up screen work are exactly what the 20-20-20 habit is designed to interrupt.
Why can screen use make your eyes feel uncomfortable?
Digital eye strain, also called computer vision syndrome, describes a collection
of symptoms associated with prolonged use of computers and other digital displays.
The
American Academy of Ophthalmology's EyeWiki overview
describes commonly reported symptoms including eye strain, dryness, burning or irritation,
headaches and blurred vision.
Long screen sessions can also affect blinking. EyeWiki also notes that blinking
can become less frequent or less complete while concentrating on a display, which
can contribute to dry-eye symptoms.
NHS guidance on dry eyes
includes long periods looking at computer screens without a break among factors
that can contribute to dry eyes, and recommends taking breaks to rest the eyes
when using a computer screen.
Why 20 minutes and 20 seconds?
The numbers make the rule memorable. They should not be treated as a medical
formula that has been proven to be uniquely optimal for every person.
The most useful principle is simpler: avoid long, uninterrupted
periods of close-up screen work and regularly give your eyes a chance to look elsewhere.
The rule is easy to understand but surprisingly difficult to follow when you are busy.
You start writing, coding, gaming or working through a spreadsheet and suddenly realise
you have been staring at the screen for an hour.
That is why reminder software can be useful. It removes the need to keep one eye on
the clock while you are trying to concentrate.
Make the habit automatic
The difficult part of any screen-break routine is remembering it while you are
concentrating. 20-20-20 Vision runs quietly on Windows and reminds you when it is
time to look away, with adjustable timing and smart pausing so it stays out of the
way during calls, presentations, video and fullscreen activity.
Windows 10 & 11 No account, no tracking Works offline Free + optional Pro
When should you seek professional advice?
A screen-break routine is a wellbeing habit, not a diagnosis or treatment.
If you have persistent or worsening eye pain, visual changes, headaches or
other symptoms, speak to an optometrist or another appropriate healthcare professional.
