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Quiz · 6 questions · about 3 min

Tired eyes? The screen habits quiz

The 20-20-20 rule, dark mode and how far away your phone should be.

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Illustration for the quiz: Tired eyes? The screen habits quiz

Six questions on screen comfort from the College of Optometrists, the American Academy of Ophthalmology and Apple. If your vision has changed or your eyes hurt, see an optometrist.

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The questions

  1. Question 1 of 6What is the 20-20-20 rule?
    Illustration of a person looking into the distance next to a phone on a desk and a stopwatch
    Illustration
    Show answer

    Answer: Every 20 minutes, look about 20 feet (6 m) away for 20 seconds

    Every 20 minutes, look at something about 20 feet (6 m) away for 20 seconds. The College of Optometrists and the American Academy of Ophthalmology give the same rule.

    Source: American Academy of Ophthalmology: tips for easing eye strain; College of Optometrists: Coronavision eye warning (Jul 2020)

    Tired eyes from screens? What helps

  2. Question 2 of 6How far from your eyes does the College of Optometrists suggest putting a computer screen?
    Show answer

    Answer: 40 to 75 cm, roughly an arm's length

    Put the screen 40 to 75 cm away, roughly an arm's length, with its top level with or slightly below your eyes.

    Source: College of Optometrists: Coronavision eye warning (Jul 2020)

    Tired eyes from screens? What helps

  3. Question 3 of 6Myth or fact: dark mode prevents eye strain.
    Show answer

    Answer: Myth: the College of Optometrists says there is no evidence it does

    The College of Optometrists has said there is no evidence that dark mode prevents eye strain. Warmer colours and dark mode are comfort settings.

    Source: College of Optometrists: Does dark mode prevent eye strain? (Sep 2019)

    Tired eyes from screens? What helps

  4. Question 4 of 6Staring at a screen changes something you do without thinking. What?
    Show answer

    Answer: You blink less, which can dry your eyes

    Staring at a screen makes you blink less, which can dry your eyes (College of Optometrists). Blink fully a few times each time you look away.

    Source: College of Optometrists: Coronavision eye warning (Jul 2020); College of Optometrists: winter eye health tips (Dec 2021)

    Tired eyes from screens? What helps

  5. Question 5 of 6An iPhone's Screen Distance feature warns you when you hold it closer than about…
    Show answer

    Answer: 12 inches (30 cm)

    Screen Distance warns when you hold the iPhone closer than 12 inches (30 cm) for a while. Apple says it needs iOS 17 or later and Face ID set up.

    Source: Apple: What is Screen Distance?

    Tired eyes from screens? What helps

  6. Question 6 of 6On Windows 11, Night light can switch on by itself at sunset. What does that schedule need?
    Windows 11 Night light page with the schedule options
    Real screenshot: Windows 11 25H2 Cloud PC
    Show answer

    Answer: Location services

    Sunset to sunrise needs location services; without them only Set hours can be chosen. That is what our Cloud PC showed, with location off.

    Source: Microsoft Support: Change display brightness and color in Windows

    Turn on Night light on Windows 11

Your score

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All the questions

  1. What is the 20-20-20 rule?
    • 20 minutes of exercise, 20 push-ups, 20 squats
    • Every 20 minutes, look about 20 feet (6 m) away for 20 seconds
    • Charge for 20 minutes at 20 percent
    • 20 cm from the screen
  2. How far from your eyes does the College of Optometrists suggest putting a computer screen?
    • 10 to 20 cm
    • 40 to 75 cm, roughly an arm's length
    • 2 metres
    • As close as is comfortable
  3. Myth or fact: dark mode prevents eye strain.
    • Fact
    • Myth: the College of Optometrists says there is no evidence it does
  4. Staring at a screen changes something you do without thinking. What?
    • You breathe faster
    • You blink less, which can dry your eyes
    • You blink more
    • Nothing
  5. An iPhone's Screen Distance feature warns you when you hold it closer than about…
    • 5 cm
    • 12 inches (30 cm)
    • 1 metre
    • It has no distance
  6. On Windows 11, Night light can switch on by itself at sunset. What does that schedule need?
    • A Microsoft 365 subscription
    • Location services
    • A second monitor
    • Dark mode

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Sources

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