CVS Computer Vision Syndrome


Eyestrain and vision problems are common amongst heavy computer users.  This is known as Computer Vision Syndrome (CVS) and results in eye fatigue, blurred vision, tension headaches, itchy eyes and tense muscles.  Eyes can also feel dry and dry eye symptoms are common.  In severe circumstances, it can cause nausea, a loss of appetite and migraines. Facial muscles may also tighten with the extrastrain which causes reduced blood circulation and further eye strain.  CVS often leads to neck, back and shoulder pain because of poor posture whilst using a computer.  The position of the monitor is very important.  If it is too high then the eyelids are retracted further than normal and more of the eye is exposed.  This can lead to dry eye.  If the monitor is low, eyes remain moist.  Computer Vision Syndrome may be exacerbated for people with existing eye problems such as refractive errors, binocular vision, and accommodative problems.  Excessive computer use by children can cause eyes to become irritated and eyesight problems may result but children don’t always report these as they assume that everyone sees the way that they see. 

The likelihood of CVS can be reduced by assessing the body’s position in relation to the computer.  External factors worth looking at are the lighting in the room, the chair, the location of paperwork and stationary, the position of the monitor, keyboard and mouse.  Glare on the computer screen from lighting and windows, should be reduced.  Chairs should be at the right height and should be comfortable with armrests providing arm support whilst typing so that wrists do not begin to ache.  High-resolution monitors are best and text size should be three times bigger than that on paper.  Eyes should be rested every couple of hours.

Eye drops are available to relax eyes and to also increase tear flow so that eyes don’t become dry.  Frequent blinking and rolling eyes backwards can also help combat dry eye.  Eyeglasses lens colour can have an impact.  Tinted lenses may reduce glare and flicker. Bifocals can be problematic, as they require the head to be tilted, which can cause neck and back problems.  It may be better to wear glasses that contain only near vision correction.

See Eye Care Guide for further information about caring for your eyes.

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