Based on an ecological analysis of the visual system, a systemic model is proposed linking visual stress and symptoms in other parts of the body. The model links the interaction between the oculomotor system and other body muscles to the slow-acting mechanism of Scohr's two-step theory of vergence control. Implications of the model have been examined in a field study. The results indicate that increased closeness between natural near work and VDU-work yield reduced symptomatology not only for eye symptoms but also for visually related symptoms in a broader sense.
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References
1.
BirnbaumM. H. (1993). Optometric Management of Nearpoint Vision Disorders. Butterworth-Heinemann, Reed publishing Inc.Boston.
2.
BizziE.KalilR.E.TagaliascoV. (1971). Eye-head coordination in monkeys: Evidence for centrally patterned organization. Science173, 452.
3.
EvansG.W.CohenS., (1987). Environmental stress. In StokelsD.AltmanI.Handbook of environmental psychology (Vol. 1), John Wiley, New York.
4.
FostervoldK.I.LieI., (1999). Variation of sitting posture in work with VDUs. The effect of downward gaze. In: BullingerH. J.ZieglerJ.Human-Computer Interaction, Ergonomics and User Interfaces, Proceedings of the 8th International Conference on Human-Computer Interaction HCI'99, Lawrence Erlbaum Associates, Publishers. 56–60.
5.
FostervoldK. I.LieI. (1997). The Ecological Viewpoint –A new Ergonomic Construct, In: MiyamotoH.SaitoS.KajiyamaM.KoizumiN., Proceedings of the fifth International Scientific Conference on Work With Display Units, NORO Ergonomics Laboratory, School of Human Sciences, Waseda University, Tokyo, 147–148.
6.
LieI.FostervoldK. I.AaråSALarsenS. (1997). Gaze Inclination and Health in VDU-operators. In SeppäläP.LuopajärviT.NygårdC. H.MattilaM.: From Experience to Innovation, IEA'97 (vol. 5), Helsinki: Finnish Institute of Occupational Health, 50–53.
7.
LieI.WattenR. (1994). VDT work, oculomotor strain and subjective complaints. An experimental and clinical study. Ergonomics, 37 (8), 1419.
8.
LieI.WattenR.G. (1987). Oculomotor factors in the aetiology of occupational cervicobrachial diseases (OCD). European Journal of Applied Physiology56, 151.
9.
LieI.WattenR.G.FostervoldK.I. (2000). Accommodation/vergence/fixation disparity and synergism of head, neck and shoulders. In: FrantzéNO.RichterH.StarkL., Accommodation/Vergence Mechanisms in the Visual System. Birkhäuser Verlag, Basel.
10.
PearceB. (1995). An Alternative Perspective on the VDT Health Hazards Debate: Folk Hazards and Health Panics. In, GriecoA.MolteniG.PiccoliB.OcchipintiE. (eds), Work with Display Units 94, Elsevier Science, Amsterdam. 15–20.
11.
SchorC. (1980) Fixation disparity: A steady state error of disparity-induced vergence. Am J Opt & Physiol Optics57: 618–631.
