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Computer vision syndrome

Staring at a computer screen for hours on end has become part of the modern workday and inevitably, all of that staring can put a real strain on your eyes.

The name for eye problems caused by computer use is computer vision syndrome (CVS). CVS is not one specific eye problem. Instead, the term encompasses a whole range of eyestrain and pain experienced by computer users.

Research shows computer eye problems are common. Somewhere between 50% and 90% of people who work at a computer terminal have at least some symptoms of eye trouble.

In addition, working adults aren't the only ones vulnerable to CVS. Children who stare at portable video games or use computers throughout the day at school can also experience eye problems related to computer use, especially if the lighting and computer position are less than ideal.

How can my computer affect my vision?

CVS is similar to carpal tunnel syndrome and other repetitive stress injuries at work. It occurs when you're carrying out the same motion over and over again. Just like those other repetitive stress injuries, CVS can get worse the longer you continue the activity.

Working at a computer requires your eyes to continuously focus, move back and forth and align with what you are seeing. You have to look down at your papers and then back up to type and your eyes have to accommodate to changing images on the screen in order to create a clear picture for your brain to interpret.

All of these functions require a lot of effort from your eye muscles. Working on a computer is more challenging to your eyes than reading a book or piece of paper because a computer screen also adds the elements of screen contrast, flicker and glare. Computer eye problems are more likely to occur if you already have an eye problem, such as short-sightedness or astigmatism, or if you need glasses but don't wear them or wear the wrong prescription for computer use.

Working at a computer gets even more difficult as you get older. That's because the lens of your eye becomes less flexible. The ability to focus on near and far objects starts to diminish after about the age of 40, a condition called presbyopia.

What symptoms are part of computer vision syndrome?

There's no evidence that CVS causes any long-term damage to the eyes such as cataracts. However, regular computer use can be the source of significant eyestrain and discomfort.

If you have CVS, you may experience some or all of these symptoms:

  • Blurred vision
  • Double vision
  • Dry, red eyes
  • Eye irritation
  • Headaches
  • Neck or back pain

If these symptoms are not treated they can have a real effect on your work performance.

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