How Far Should You Sit From Your Screen?
For a computer monitor, sit about an arm’s length away — roughly 50 to 70 cm — with the top of the screen at or just below eye level so your gaze tilts slightly down. To ease eye strain, follow the 20-20-20 rule: every 20 minutes, look at something about 20 feet away for 20 seconds. Viewing distance also matters for any on-screen vision test, since it sets how large letters appear to your eye.
Test your acuity (distance-aware) →The comfortable setup
A good default is an arm’s length from a laptop or monitor (about 50–70 cm), a bit farther for a large screen, with the top of the display at or just below eye level. Phones are naturally closer, around 30–40 cm. There’s nothing magic about the exact number — comfort and a slightly downward gaze angle matter more than precision.
“Computer eye strain” (digital eye strain) comes mostly from reduced blinking, glare, and long unbroken focus, not from the screen damaging your eyes. The fixes are boring and effective: the 20-20-20 rule, decent lighting to cut glare, and blinking on purpose.
Why distance matters for a vision test
A letter’s difficulty depends on the angle it makes at your eye, which depends on both its physical size and how far away you are. That’s why a trustworthy on-screen visual acuity test asks for your viewing distance and calibrates letter sizes to match — sit closer and letters are easier, farther and they’re harder. Getting the distance right is what makes the result meaningful.
Getting the screen to eye level and keeping your eyes from drying out are the two changes that most reduce strain — and both cost a few dollars.
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