Computer Vision Syndrome: What Is It, and How Long Does It Last?

Computer vision syndrome (CVS) is caused by using digital displays — including computer monitors, laptops, tablets, e-readers, and smartphones — for too long without a break, without blinking enough, at an improper distance, or before sleep.

Symptoms include dry eyes and headaches, along with other kinds of strain that lead to overall fatigue.

While you can make the recommended lifestyle and environmental changes recommended for Computer Vision Syndrome without a diagnosis, an optometrist or ophthalmologist will be able to tell you if CVS is impacting your vision, making a refraction error worse (like temporary myopia), and what else you can do about it, like using special blue light-filtering glasses or attending visual therapy sessions to protect your eyes.

What Is Computer Vision Syndrome?

Computer vision syndrome (CVS) has an ominous ring because it is a serious type of repetitive strain injury that affects your vision, along with other aspects of your physical health. The condition is also called digital eye strain.

The average American worker spends seven hours a day in front of a screen of some kind — at work, during transit, and at home. Much of this screen time is white-collar labor, but increasingly, communication with loved ones and hobbies like gaming involve using a digital screen too.

Computer Vision Syndrome is characterized by:

• Eye, head, and neck discomfort
• Use of computers, tablets, smartphones, or e-readers that emit specific frequencies of blue light
• Using the eyes in specific patterns, like reading left to right repeatedly
• Trying to focus on bright objects that may be too small or too far away, like text on a small screen

Symptoms of Computer Vision Syndrome

If you spend two or more consecutive hours in front of a computer per day, you may develop computer vision syndrome (CVS).

Common symptoms of computer vision syndrome include the following:

• Eye strain
• Headaches
• Blurry vision
• Dry eyes
• Eye fatigue
• Neck and shoulder pain related to head and eye tension

Some people may experience dizziness, motion sickness, or tiredness after working with a digital screen for too long.

What Causes Computer Vision Syndrome?

There are several potential causes of these symptoms, including:

• Poor lighting in the room.
• Glare from the digital screen.
• Improper viewing distance, either too close or too far away.
• Poor seated posture.
• Uncorrected vision problems.
• Blinking less than normal.

Often, CVS results from a combination of these issues. Your seat may cause you to tilt forward, you may be sitting in too dark a room, and a refractive error like nearsightedness may be getting worse, for example.

Many people who stare intently at what they are working on do not blink enough, and this appears to be a very common cause of dry eye and eye strain among those using bright digital displays. The average healthy eye should blink 15 times per minute, but people who use computers or laptops are likely to blink a third as often while they are working.

Reading, writing, or performing close activities like sewing can also cause eye strain, but computer vision syndrome is unique in both causes and daily impact. With smaller, portable screens being used more often, you may add additional strain to your eyes, neck, head, and shoulders by viewing tablets or phones at uncomfortable angles.

How Is Computer Vision Syndrome Diagnosed?

To determine if you suffer from CVS, your optometrist will conduct a few tests.

• Patient history assessment: This will help your eye doctor understand your current level of screen use, your experience of vision problems, and any underlying health issues you may have.
• Visual acuity measurements: This includes the Snellen chart and other types of tests to determine your overall eye health and what might contribute to your eye strain.
• Refraction tests: These help your eye doctor determine your prescription, which can help them make recommendations about computer and other screen use to reduce the impact on your visual acuity.
• Eye focus tests: These are used to see how well your eyes focus on objects near and far, and to determine how the eyes move together.

Treating CVS

Changes to underlying vision problems (from refractive errors like farsightedness or myopia), inadequate focusing in the eyes or eye coordination problems, and aging eyes, including the development of presbyopia, can all contribute to an increased risk of strain when using a computer for a lengthy period of time.

These treatments and prevention approaches can help:

• Try the 20-20-20 Rule. Work on a digital screen for 20 minutes; then, take a break for 20 seconds, preferably looking at something 20 feet away. This will give your eyes a needed break.
• Check your setup. Adjust the level of your screen in relation to your eyes, along with how your workspace is set up, to reduce the overall strain on your body, not just your eyesight. Sitting about arm’s length, or 25 inches, from your computer screen is the recommended safety distance.
• Consider antiglare screens. Antiglare screens can help to reduce or prevent CVS.
• Assess light levels. Making sure the light level in the room around your workspace is appropriate can help to manage eye strain.
• Take short breaks to blink. When you use a computer screen for a long time, you may not blink enough because you are concentrating on your work. This can lead to dry eye, which may be temporary. On a long-term basis, it can cause irritation and inflammation of the eye.
• Apply eye drops. These can help if your eyes feel too dry, itchy, or irritated. If you have chronic dry eye, you may consider using a humidifier for the room.
• Have your vision checked. You may need an updated glasses prescription.
• Consider blue-light glasses. There are specific lenses for glasses that reduce the amount of blue light from computer screens that hits your eyes, which can reduce eye strain and improve sleep because it does not impact the circadian rhythm as much after dark.
• Try vision training. If you follow your optometrist’s instructions and have made lifestyle changes to manage computer vision syndrome but are still struggling with pain, blurry vision, and dry eye, you may need to undergo visual therapy called vision training. This is a structured program that teaches you routines and exercises to improve your visual abilities, especially while you work.

Risks From Untreated CVS

Most symptoms associated with CVS are temporary, and they go away a few hours after you stop using the digital screen. If problems leading to consistent eye strain are not resolved, repeated experience of these issues can lead to reduced visual acuity after stopping work on the screen, and this may get worse.

Other problems can be caused by ocular surface mechanisms. Extended periods of suffering from dry eyes due to not blinking enough can increase irritation and inflammation, which may trigger further conditions including uveitis.

Poor sleep quality and insomnia are other issues associated with digital eye strain. One study found that 80 percent of Americans report using digital devices, including television, at least an hour before going to bed. The blue light emitted from such devices can trigger a stronger sense of wakefulness in the brain, which reduces the ability to fall asleep or stay asleep. About 55 percent of people use some kind of digital screen within an hour after they wake up, which contributes to a higher risk of eye strain throughout the day.

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