|Document ID (ISN)||42906|
|Convention or series no.
||Arbete och hälsa 1983:6
||Carlsson L., Knave B., Lennerstrand G., Wibom R.
||Glare with outdoor high-mast illumination - Visual acuity and contrast sensitivity effects in studies on different floodlighting systems
||Bländning vid utomhus högmast-belysning - Effekter på synskärpa och kontrastkänslighet i jämförande studier över olika [in Swedish]|
||Arbetarskyddsstyrelsen, Publikationsservice, 171 84 Solna, Sweden, 1983. 27p. Illus. 7 ref.
||Glare effects on visual acuity and contrast sensitivity were studied during outdoor timber yard work (sorting of logs) with two different systems of floodlighting. The binocular visual acuity of 19 volunteers was measured at 40, 55 and 80% contrast and the contrast sensitivity of 14 volunteers at spatial frequencies of 0.5 to 16 cycles/degree. One of the lighting systems used conventional floodlights with symmetrical distribution of the light over a wide area. The other system used a new type of oblique floodlight with an asymmetrical light distribution. With the light source 15° from the centre of the visual field, the visual acuity and the contrast sensitivity were consistently lower with the conventional type than with the new type of floodlight. Thus, not only is the vision of details impaired by glare but so is the contrast perception of coarse patterns. The workers scored the difference in glare between the two floodlight systems as "great" to "very great".
||floodlighting; contrast; glare; sawmilling industry; visual tasks
||lighting; visual acuity; hand sorting
||E - Books, reports, proceedings
||Lighting, colour and vision
|Broad subject area(s)
||Lumber and the woodworking industry
Lighting and colour