Abstract
This chapter provides an overview of visual display terminals (VDTs). There is a fear that VDTs may cause skin irritation and allergies. It is a fact that some radiant energy of the electromagnetic spectrum can cause cataracts in people. However, the amount of energy needed to produce a cataract is very high indeed, far above that emitted by a VDT. It is felt by some people that whether or not VDTs cause damage to the eyes, they certainly may cause eye strain. Eye strain is a somewhat unfortunate expression; it is more appropriate to speak of visual discomfort as the sort of symptoms which people complain of are watery eyes, aching eyes, headaches, and difficulty in focusing. The visual well-being of the VDT user is affected by the task they have to carry out that depends critically on the VDT equipment they are provided with. The screen which is to be viewed must provide a clear and stable image.
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