How Computers and Devices Affect Your Eyes

Many people spend a lot of time looking at screens on their computers, phones, and tablets. As a result, it’s common to experience tired, dry, or blurry eyes, which is known as digital eye strain or computer vision syndrome. Luckily, these symptoms are usually temporary and can be managed with some simple habits and good eye care. (1) (2)

In this article, we’ll explore what digital eye strain is, how screens can impact our eyes, and the common symptoms to watch for. We’ll also provide tips for protecting your eyes both at work and at home, discuss special considerations for children’s screen time, and highlight when it’s important to consult an eye doctor.

What Is Digital Eye Strain?

Digital eye strain is a group of vision and eye comfort problems that happen after prolonged use of computers, phones, tablets, or other digital screens. (3)

Common symptoms include:

Tired, aching, or burning eyes
Dry or watery eyes
Blurry or fluctuating vision
Headaches, especially around the eyes
Difficulty focusing from near to far
Neck and shoulder pain from poor posture (3)

Many people experience symptoms after two or more hours of continuous screen time, which is easy to reach during a typical workday. (9)

Screens affect your eyes in several ways at once:

You Blink Less: When you concentrate on a screen, your blink rate can decrease by one-third to one-half. Reduced blinking allows your tears to evaporate more quickly, leading to dryness, burning, and a gritty feeling. (19)
Constant “Near Work”: Your eyes have to work harder to focus on close objects than distant ones. Long stretches of close-up work on screens or even books can overwork the focusing muscles and cause fatigue and headaches. (3)
Glare, Contrast, and Poor Lighting: Glare from overhead lights or windows, harsh contrast, and reflections on the screen all make your eyes work harder to see clearly. This increases strain and can worsen headaches. (1)
Posture and Screen Position: If your screen is too high, too low, or too close, you’ll unconsciously lean forward or crane your neck, which contributes to neck, shoulder, and eye discomfort. Ideally, your monitor should be about 20–28 inches away and slightly below eye level. (2)
Blue Light and Sleep: Blue light from screens doesn’t appear to cause eye diseases like macular degeneration, but it can interfere with your sleep-wake cycle if you use screens late at night. That disrupted sleep can leave your eyes feeling even more tired the next day. (18)

Common Symptoms You Shouldn’t Ignore

Most symptoms of digital eye strain improve when you take breaks. However, if you frequently experience any of the following, it’s important to pay attention:

Blurry vision that comes and goes while using screens
Difficulty refocusing after looking away from your device
Headaches following days with heavy screen use
Dry, burning, or watery eyes, particularly in work settings
Light sensitivity or difficulty driving at night. (4)

Persistent symptoms may indicate unresolved vision issues, such as an outdated prescription, astigmatism, or focusing difficulties, as well as other eye conditions that require professional attention. (3)

Simple Habits to Reduce Eye Strain

You don’t have to give up your devices to protect your eyes. A few small changes can make a big difference.

Follow the 20-20-20 Rule: Every 20 minutes, take 20 seconds to look at something at least 20 feet away. This may help relax your eye muscles and reset your vision. (3) You can:

Set a reminder on your phone or computer
Use a browser extension or app
Pair breaks with a quick stretch or drink of water

Blink More (On Purpose): Make a habit of slow, full blinks, especially when typing or reading long documents. This helps spread tears across the eye’s surface and reduces dryness. (9) Artificial tears can help if your eyes feel dry, gritty, or tired. If you use them often, choose preservative-free types. (17)

Optimize Your Screen Setup:

Keep your main screen at arm’s length (about 25 inches).
Position the top of the screen slightly below eye level.
Use a stand or external monitor instead of working from a laptop on your lap. (1)

Fix Lighting and Glare

Avoid facing or sitting directly in front of bright windows.
Use blinds, curtains, or a desk lamp instead of harsh overhead light.
Consider an anti-glare screen filter if reflections are a big issue. (1)

Adjust Your Device Settings

Increase font size and contrast so you’re not squinting.
Use “dark mode” or “night mode” in the evening to reduce glare and improve sleep quality.
Lower the screen brightness to match the room’s. (18)

Consider Computer-Specific Glasses

Some people benefit from prescription glasses made for the distance between their eyes and the screen. These glasses are different from regular reading glasses and may help reduce eye strain and neck pain. (3)

What about blue-light–blocking glasses? Current evidence suggests they’re not essential for most people, and professional organizations do not universally recommend them for digital eye strain. Good habits and proper ergonomics matter more.

Kids, Teens, and Screen Time

Children and teens are spending more time on screens for school, gaming, and socializing, and their eyes are still developing. High daily screen time has been linked to a higher risk of myopia (nearsightedness) and more eye strain symptoms. (13)

Tips for families:

Encourage outdoor time every day when possible. (15)
Build in screen breaks with the 20-20-20 rule.
Watch for signs like squinting, rubbing eyes, sitting very close to screens, or poor school performance. (16)

If you notice these signs, schedule a comprehensive eye exam — especially if there’s a family history of myopia.

When to See an Eye Doctor

Digital eye strain is common, but it’s essential not to ignore persistent or severe symptoms. Make an appointment with an ophthalmologist or optometrist if you experience:

Blurry vision that doesn’t clear with rest
Frequent or severe headaches with screen use
Eye pain, redness, or significant dryness
Double vision, halos, or loss of side vision
Sudden changes in vision of any kind (5)

A comprehensive eye exam can:

Check your prescription and focusing ability
Evaluate the surface of your eyes for dry eye disease
Rule out other eye conditions that may be masquerading as “just strain” (4)

Early diagnosis means more options to keep you comfortable and protect your long-term vision.

The Bottom Line

Computers and digital devices are part of everyday life, but eye discomfort doesn’t have to be. You can reduce digital eye strain by understanding how screens affect your eyes and adopting a few simple habits.

Follow the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds. Make sure your workspace is comfortable, remember to blink often, and keep up with regular eye exams. If you have symptoms that bother you or get worse, see an eye care professional for help and to rule out serious issues.

References

American Academy of Ophthalmology. Computers, Digital Devices and Eye Strain. Updated June 27, 2024. American Academy of Ophthalmology
American Academy of Ophthalmology. Digital Devices and Your Eyes. Updated Oct 15, 2024. American Academy of Ophthalmology
American Optometric Association. Computer Vision Syndrome. American Osteopathic Association
Cleveland Clinic. Computer Vision Syndrome. Cleveland Clinic
Cedars-Sinai. Computer Vision Syndrome – Digital Eye Strain. Cedars-Sinai
American Optometric Association. Eye Health Guidance for Screen Time. American Osteopathic Association
AOA. 20-20-20 Rule – To Prevent Digital Eye Strain. American Osteopathic Association
Datta S, et al. The 20/20/20 rule: Practicing pattern and associations with digital eye strain. 2023. PMC
Kaur K, et al. Digital Eye Strain—A Comprehensive Review. 2022. PMC
Singh S, et al. Blue-light filtering spectacle lenses for visual performance, sleep, and macular health in adults. Cochrane systematic review, 2023. PubMed
Review of Optometry. Evidence Lacking for Blue-Light Blocking Lens Claims. Aug 25, 2023. Review of Optometry
Munsamy AJ, et al. Evidence on the effects of digital blue light on the eye. Afr Vision Eye Health. 2022. Aveh Journal
Ha A, et al. Digital Screen Time and Myopia: A Systematic Review and Dose-Response Meta-analysis. JAMA Network Open. 2025. JAMA Network+1
Khutan S, et al. Correlating outdoor time, screen-time and myopia progression. BMJ Open Ophthalmology. 2025. BMJ Ophthalmology
MyKidsVision. All About Outdoor Time. My Kids Vision
Children’s Hospital of Philadelphia. How Too Much Screen Time Affects Kids’ Eyes. Children’s Hospital of Philadelphia
Brown Health. Digital Eye Strain, Blue Light, and Tips on How to Relieve Your Eyes. Brown Health
Verywell Health. How to Protect Your Eyes From Digital Screens. 2025. Verywell Health
Oregon Eye Physicians & Surgeons. Screen Time and Eye Health. oregoneyephysicians.org
Penn Medicine. Computer Vision Syndrome – Symptoms and Causes. 2025. Penn Medicine