From ComputerWeekly.com:
A survey of 1,500 UK office workers by market research firm Tickbox.net, on behalf of ergonomic monitor firm ViewSonic, shows a link between poor ergonomics knowledge and ailments such as headaches, eye fatigue and backache.
The study reveals that 46% of office workers spend six or more hours in front of their computer screens each day, and 51% of these are not scheduling appropriate breaks according to ergonomic guidelines.
Around three-quarters of respondents said they suffered from headaches (67%), eye fatigue (77%) and backache (71%).