Computer Vision Syndrome refers to a number of different problems that tend to show up with computer use. This includes headache, dry eye, redness, irritation, sporadic blur, or other problems.

The most significant issue with computer use refers to the location of the screen and the length of time most people spend looking at it. There are a number of systems at work when we sit down to check email.  For one, the eyes need to be focussed at the correct distance to keep things sharp. Secondly, both eyes need to be directed to the correct point in space to prevent double vision. Lastly, there are the effects of long-term concentration.