The potential dangers of the booming use of new technology in the office and at home were outlined by researchers at the Toho University school of medicine in Tokyo, Japan, in the Journal of Epidemiology. They tested 10,000 workers with an average age of 43 as part of a general medical check-up as well as collecting their histories of computer use and eye disease. Just over 5% had visual field abnormalities and there appeared to be a significant link between these and heavy computer use among those with long or short sight. But detailed eye tests revealed that a third...