A desk job is supposed to be safe. No one needs a hard hat to type a memo or protective goggles to shuffle paper. But as the work force migrates from the shop floor to the corporate cubicle, millions of people face what some think may be a new health hazard -- the omnipresent video-display terminal, or VDT. * Basing their charges on a scattershot array of scientific data, union leaders claim that prolonged work in front of a computer screen can impair vision and cause headaches. Some critics say the work may even trigger miscarriages. The unions' campaign to win...
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