Digital Eye Strain: How to Use the 20-20-20 Rule

Desk checklist

Setting	Aim for	Quick check
Screen Distance	Position your monitor about an arm’s length away from your face.	Sit back comfortably and extend your arm straight out. Your fingertips should just about touch the screen.
Screen Height	Place the monitor so the top of the screen is at or slightly below your eye level.	Close your eyes for a moment. When you open them, your gaze should naturally fall on the top third of the screen.
The 20-20-20 Rule	Every 20 minutes, take a 20-second break to view something 20 feet away.	Set a timer or use a simple app to remind you. Look out a window or at a distant object across the room.
Reduce Glare	Minimize reflections on your screen from windows and overhead lights.	Turn your monitor off. Look at the dark screen. If you can see clear reflections of lights or windows, reposition your screen or use a glare filter.
Text Size and Contrast	Adjust your display settings so text is large enough to read easily without squinting. Use dark text on a light background.	Lean back in your chair. Can you read the text on your screen comfortably without leaning forward or straining your eyes?
Blinking	Blink fully and frequently to keep your eyes moist.	Notice if your eyes feel dry or tired. Try to do a few slow, complete blinks, like you are gently trying to fall asleep for a moment.

Digital eye strain, also called computer vision syndrome, refers to a group of eye and vision problems from prolonged use of digital screens. Common symptoms include eye discomfort, headaches, blurred vision, and dry eyes.

These issues are often caused by poor lighting, screen glare, incorrect viewing distances, or uncorrected vision problems. A few simple adjustments to your workspace and habits can help manage this discomfort.

Position Your Monitor for Comfort

An easy way to check your monitor’s position is to sit back and extend your arm. Your fingertips should just touch the screen, placing it about an arm’s length away. The top of the screen should be at or slightly below your eye level. When you open your eyes after closing them for a moment, your gaze should naturally land on the top third of the display.

Glare from windows and overhead lights is a common problem. To check for it, turn your monitor off and see if you can spot clear reflections on the dark screen. If you can, try turning your desk or monitor to avoid the direct light source. Also, adjust your screen’s brightness to match the general light level in your room, as working in a dark room with a very bright screen can strain your eyes.

Finally, check your display settings. Text should be large enough to read easily from your seated position without leaning forward or squinting. Using dark text on a light background provides good contrast for comfortable reading.

Develop Healthier Screen Habits

Give your eyes regular breaks by following the 20-20-20 rule. Every 20 minutes, look away from your screen at an object about 20 feet away for a full 20 seconds. You can set a timer to remind yourself until it becomes a habit.

People tend to blink less frequently when concentrating on a screen, which can lead to dry eyes. Make a conscious effort to blink more often. If your eyes feel dry, try doing a few slow, complete blinks to help keep them moist.

Common mistakes

Working in a dark room with a very bright screen.
Positioning the screen too close, too high, or too low.
Forgetting to take regular breaks to rest your eyes.
Ignoring glare from windows or overhead lights on the screen.
Straining to read text that is too small.
Infrequent blinking while concentrating on the screen.

Low-cost fixes

Follow the 20-20-20 rule for regular eye breaks.
Increase the font size in your computer’s display settings.
Adjust your screen’s brightness to match the lighting in your room.
Turn your desk or monitor to avoid direct light from a window.
Make a conscious effort to blink more often while working.

What it will not do

These tips do not replace a professional eye examination.
This guidance cannot correct underlying vision problems like farsightedness or astigmatism.
It may not resolve all symptoms if they are related to other medical conditions.
It does not address ergonomic issues unrelated to vision, such as wrist or back pain.

Quick questions

What is the 20-20-20 rule for eye strain?

The 20-20-20 rule is a simple method to rest your eyes. Every 20 minutes, take a 20-second break to look at something that is 20 feet away.

How far should my computer screen be from my eyes?

Your monitor should be positioned about an arm’s length away from your face. When you are sitting back comfortably, you should be able to just about touch the screen with your fingertips.

Can these tips fix my vision problems?

This guidance is meant to help with discomfort from screen use but does not replace a professional eye examination. It cannot correct underlying vision problems like farsightedness or astigmatism.

When to see a doctor or physio

If your symptoms continue or get worse after making these adjustments, it is a good idea to seek a professional opinion. See an eye doctor if you experience persistent dry or red eyes, frequent headaches, or blurred vision, especially if you have not had an eye exam in the last couple of years.

You experience persistent dry, red, or irritated eyes.
You have frequent headaches, especially in the afternoon or evening.
You notice blurred or double vision that does not improve after a break.
Your symptoms continue or worsen despite making these adjustments.
You have not had an eye exam in the last couple of years, as you may need corrective lenses.

How this page was put together: general guidance consistent with public workstation and movement-break resources from OSHA, CDC/NIOSH and the NHS, and with standard exercise handouts. It was drafted with AI assistance, checked in a separate review pass and edited under our editorial policy. It is not medical advice and no clinician reviewed it. Last checked October 2026.