Postural modifications of VDU operators wearing bifocal spectacles.

  title={Postural modifications of VDU operators wearing bifocal spectacles.},
  author={Donald K Martin and Stephen J. Dain},
  journal={Applied ergonomics},
  volume={19 4},
This paper describes the postural changes experienced by presbyopic operators of VDU workstations while wearing a pair of bifocal spectacles. All operators reported in this paper had suffered neck and back aches, in addition to generalised problems of asthenopia, while using the VDU workstation. The ages of the operators ranged between 47 and 58 years. The operators' head movements, in looking from the keyboard to the screen, were two to three times greater when bifocal spectacles were worn… CONTINUE READING