The relevant regulations are the Health and Safety (Display Screen Equipment) Regulations 1992. Regulation 4, is concerned with the daily activities of users and states:
'Every employer shall so plan the activities of users at work in his undertaking that their daily work on display screen equipment is periodically interrupted by such breaks or changes of activity as reduce their workload at that equipment.'
The guidance states:
In most tasks, natural breaks or pauses occur as a consequence of the inherent organisation of the work. Whenever possible, jobs at display screens should be designed to consist of a mix of screen-based and non screen-based work to prevent fatigue and to vary visual and mental demands. Where the job unavoidably contains spells of intensive display screen work (whether using the keyboard or input device, reading the screen, or a mixture of the two), these should be broken up by periods of non-intensive, non-display screen work. Where work cannot be so organised, e.g. in jobs requiring only data or text entry requiring sustained attention and concentration, deliberate breaks or pauses must be introduced.
Where the display screen work involves intensive use of the keyboard, any activity that would demand broadly similar use of the arms or hands should be avoided during breaks. Similarly, if the display screen work is visually demanding any activities during breaks should be of a different visual character. Breaks must also allow users to vary their posture. Exercise routines which include blinking, stretching and focusing eyes on distant objects can be helpful and could be covered in training programmes.
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It is not appropriate to lay down requirements for breaks which apply to all types of work; it is the nature and mix of demands made by the job which determine the length of break necessary to prevent fatigue. But some general guidance can be given:
L26, Display Screen Equipment Work - Guidance on Regulations, (ISBN 0717604101- available from HSE Books)