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Computer vision syndrome (CVS), also called digital eye strain, is a group of eye, vision and body symptoms associated with prolonged use of computers, tablets, e-readers and phones. It can include dry or irritated eyes, blurred vision, headaches and neck or shoulder discomfort. Symptoms after screen use do not by themselves prove a diagnosis, and the American Academy of Ophthalmology says screen viewing has not been shown to cause permanent eye damage.
What does computer vision syndrome mean?
CVS describes symptoms associated with sustained screen use and the visual demands of prolonged near work. The American Optometric Association and the American Academy of Ophthalmology’s EyeWiki use the term for a group of eye- and vision-related problems; EyeWiki also includes musculoskeletal symptoms. “Digital eye strain” is a closely related everyday term.
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It is a symptom group, not one single symptom or a diagnosis that can be made from screen use alone. Similar discomfort can have different contributing factors, so recurring problems may need an eye-care assessment.
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Symptoms vary and can involve the eyes, vision or other parts of the body:
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- Eye symptoms: dryness, burning, redness, tearing, irritation, a gritty feeling, aching or tired eyes.
- Vision symptoms: blurred or double vision, or difficulty shifting focus after looking at a screen.
- Other discomfort: headaches and neck, shoulder or back discomfort.
These symptoms are commonly associated with prolonged computer use, but any one symptom can have causes unrelated to screens.
Why can screens contribute to discomfort?
Extended near work can place sustained demands on focusing. Screen use may also coincide with reduced blinking, which can aggravate dryness. Glare, brightness that does not suit the room, viewing distance or screen position, posture and uncorrected vision problems are additional factors to consider. There is not one cause that explains every person’s symptoms.
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The American Academy of Ophthalmology says prolonged digital-device use can cause temporary discomfort but has not been shown to permanently damage eyes. That distinction matters: discomfort is real, but it is not evidence that a screen has injured healthy eyes.
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What can help ease digital eye strain?
Take brief distance breaks
Every so often, look away from the screen at a distant object. One commonly used version is the 20-20-20 approach: about every 20 minutes, look roughly 20 feet away for 20 seconds. Blink normally and take short breaks during long sessions.
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Make the viewing setup comfortable
Try a comfortable viewing distance—about arm’s length is commonly advised—and position the screen so you look slightly downward. Reduce reflections and glare, and adjust screen brightness and contrast to suit the surrounding light. A matte filter may help manage reflections, although reducing glare does not necessarily relieve eye-strain symptoms for everyone.
Address dryness and vision needs
Lubricating eye drops may ease dry-eye symptoms, but they do not treat every possible cause of CVS. If symptoms keep recurring, an eye-care professional can assess whether vision correction or another issue is contributing. Prescription lenses suited to computer working distance may help some people; they are different from non-prescription blue-light-blocking glasses.
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Do blue-light glasses prevent computer vision syndrome?
Blue light is not an established cause of digital eye discomfort. The American Academy of Ophthalmology states, “Digital eye discomfort is not caused by blue light,” and says blue light from computer screens has not been shown to harm eyes. It does not recommend paying extra for special computer eyewear on that basis.
A 2022 systematic review and meta-analysis published by the American Academy of Ophthalmology considered 45 randomized controlled trials involving 4,497 participants. It found low-certainty evidence that blue-blocking spectacles did not reduce visual-fatigue symptoms. The review searched trials through November 23, 2021, and its findings do not mean every treatment question is settled. It found no high-certainty evidence supporting the therapies assessed; low-certainty evidence suggested oral omega-3 may reduce dry-eye symptoms in symptomatic computer users, which is not a basis for broadly recommending supplements.
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When should you seek an eye-care assessment?
Consider arranging an assessment if symptoms persist or keep returning, especially if blurred vision or difficulty refocusing is affecting daily activities. A professional can check for uncorrected vision needs and consider other explanations rather than assuming screen use is the only cause. Lubricating drops may help dryness, but persistent symptoms warrant more than simply changing screen settings.
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