Computer screens linked to eyesight problems

Using a computer for long periods may increase the risk of eye disease and should be monitored by employers, according to recent research.

The study by Masayuki Tatemichi and others, reported in this month's Journal of Epidemiology and Community Health, looked at 10,000 workers in Japan. It found that 5% of them had "visual field abnormalities" that could lead to the progressive eye disease glaucoma.

Visual abnormalities were more common among workers with existing visual defects such as short-sightedness (myopia). Further tests on the workers found to have abnormalities revealed that 32% already had suspected glaucoma - a disease that can cause blindness but which normally affects less than 1% of the population.

The International Glaucoma Association said: "This is the first evidence we have seen of a link between the use of computers and glaucoma, but it is perfectly reasonable to expect some effect on the visual system.

"It would be wise for anyone involved in heavy use [of computer equipment] to ensure that they receive regular comprehensive eye examinations in order to detect the earliest possible signs of the development of glaucoma."

The findings contradict Health and Safety Executive (HSE) advice that work with computer visual display units (VDUs) does not cause long-term eye problems. The HSE's Working with VDUs leaflet, revised last year, says: "Extensive research has found no evidence that VDUs can cause disease or permanent damage to eyes."

The Tatemichi report can be downloaded from jech.bmjjournals.com/cgi/reprint/58/12/1021

Working with VDUs is available at www.hse.gov.uk/pubns/indg36.pdf