Moderate evidence was observed for : ( 1 ) no effect of workstation adjustment , ( 2 ) no effect of rest breaks and exercise and ( 3 ) positive effect of alternative pointing devices .
For all other interventions mixed or insufficient evidence of effect was observed .
Conclusion : Few high quality studies were found that examined the effects of interventions in the office on musculoskeletal or visual health
Background : The literature examining the effects of workstation , eyewear and behavioral interventions on  musculoskeletal and visual symptoms among computer users is large and heterogeneous .
Methods : A systematic review of the literature used a best evidence synthesis approach to address the general question “ Do office interventions among computer users have an effect on musculoskeletal or visual health ? ”
Effect of keyboard keyswitch design on hand pain.
This r and omized clinical trial evaluated the effects of keyboard keyswitch design on computer users with h and paresthesias . Twenty computer users were matched and r and omly assigned to keyboard A ( n = 10 ) or B ( n = 10 ) . The keyboards were of conventional layout and differed in keyswitch design . Various outcome measures were assessed during the 12 weeks of use . Subjects assigned keyboard A experienced a decrease in h and pain between weeks 6 and 12 when compared with keyboard B subjects ( P = 0.05 ) and demonstrated an improvement in the Phalen test time ( right h and , P = 0.006 ; left h and , P = 0.06 ) . Keyboard assignment had no significant effect on change in h and function or median nerve latency . We conclude that use of keyboard A for 12 weeks led to a reduction in h and pain and an improved physical examination finding when compared with keyboard B. There was no corresponding improvement in h and function or median nerve latency
Moderate evidence was observed for : ( 1 ) no effect of workstation adjustment , ( 2 ) no effect of rest breaks and exercise and ( 3 ) positive effect of alternative pointing devices .
For all other interventions mixed or insufficient evidence of effect was observed .
Conclusion : Few high quality studies were found that examined the effects of interventions in the office on musculoskeletal or visual health
Background : The literature examining the effects of workstation , eyewear and behavioral interventions on  musculoskeletal and visual symptoms among computer users is large and heterogeneous .
Methods : A systematic review of the literature used a best evidence synthesis approach to address the general question “ Do office interventions among computer users have an effect on musculoskeletal or visual health ? ”