Some recent results by Rowlands el al. have challenged the established relationship between illuminance, visual performance and task difficulty. A distinction can be drawn between task complexity, the number of operations needed to complete the task, and visual difficulty, the difficulty in seeing the detail required. It is then pqssible to show that the results of Rowlands et al. fit the established pattern and successfully to predict the results of a visual performance experiment using Landolt rings of the same visual difficulty but different task complexities.
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References
1.
Rowlands, E., Loe, D., Waters, D., and Hopkinson, R. G. CIE Barcelona (1971).
2.
Rowlands, E., Loe, O., Waters, I., and Hopkinson, R.G.University College Environmental Research Group report (March 1973).
3.
Weston, H.G., Medical Research Council Industrial Health Research Board report 87, HMSO, London (1945).
4.
Boyce, P.R., Ltg Res. & Technol., 5, 125 (1973).
5.
Muck, E., and Bodmann, H.W., Lichttechnik, 10, 502 (1961).
6.
A unified framework of methods for evaluating visual performance aspects of lighting, CIE report 19 ( 1972).
