The 20-20-20 Rule: How to Protect Your Eyes from Digital Eye Strain
Whether you are answering emails, scrolling through social media, or binge-watching your favorite show, chances are you spend a significant portion of your day staring at a screen. While our devices keep us connected and productive, they also demand a lot from our eyes.
If you frequently end your day with tired, dry eyes or a nagging headache, you are likely experiencing Digital Eye Strain (also known as Computer Vision Syndrome). Fortunately, one of the most effective ways to combat screen-related fatigue is completely free, takes almost no time, and is incredibly easy to remember: The 20-20-20 Rule.
What is Digital Eye Strain?
When we look at screens, our eyes have to work much harder to focus than when we look at printed materials. The glare, the contrast, and the constant shifting of focus can exhaust your eye muscles. Furthermore, studies show that we blink up to 66% less often when staring at a computer or smartphone. Less blinking means less moisture, leading to dry, irritated eyes.
Common symptoms of Digital Eye Strain include:
- Sore, tired, burning, or itching eyes
- Watery or dry eyes
- Blurred or double vision
- Headaches
- Increased sensitivity to light
- Sore neck, shoulders, or back
If you recognize these symptoms, it is time to start giving your eyes a much-needed break.
What is the 20-20-20 Rule?
Developed by optometrists, the 20-20-20 rule is a simple habit designed to give your focusing muscles a chance to relax. Here is how it works:
Every 20 minutes, look at something at least 20 feet away, for at least 20 seconds.
Why 20 seconds?
It takes about 20 seconds for the muscles in your eyes to completely relax and reset their focus.
Why 20 feet?
Looking at objects up close requires your eyes to constantly engage their focusing muscles. Looking at a distance of 20 feet or more allows those muscles to rest. If you are in a small room, simply look out a window!
How to remember:
It is easy to lose track of time when you are deep into a project. Try setting a recurring timer on your phone or using a browser extension that gently reminds you when it is time to look away.
Additional Tips to Protect Your Eyes
While the 20-20-20 rule is a fantastic first line of defense, pairing it with a few ergonomic adjustments can make your workday even more comfortable:
- Adjust Your Screen: Your screen should be about an arm’s length away (25 inches) and positioned so your gaze is slightly downward.
- Reduce Glare: Position your monitor to avoid glare from windows or overhead lights. You can also apply a matte screen filter to your monitor.
- Remember to Blink: Make a conscious effort to blink fully and frequently. If your eyes still feel dry, consider keeping a bottle of artificial tears at your desk.
- Invest in Computer Glasses: If you wear prescription glasses, talk to an eye care professional about lenses optimized for computer distance. Anti-reflective (AR) coatings and blue-light-filtering lenses can also help reduce glare and improve visual comfort.
When to See an Optometrist
The 20-20-20 rule is a great preventative measure, but it is not a cure-all. If you practice good screen habits but still experience persistent headaches, blurry vision, or dry eyes, it is time to schedule a comprehensive eye exam.
Uncorrected vision problems—even minor ones like mild astigmatism or farsightedness—can make digital eye strain significantly worse. An optometrist can evaluate your eye health, update your prescription, and recommend personalized solutions to keep your eyes comfortable.
Take a proactive approach to your long-term eye health and book a visit with your local eye care provider to conquer digital eye strain once and for all.
