ILO Home
Go to the home page
Site map | Contact us Français | Español

CISDOC database

Document ID (ISN)42906
CIS number 84-1881
ISBN(s) 91-7464-160-3
Year 1983
Convention or series no. Arbete och hälsa 1983:6
Author(s) Carlsson L., Knave B., Lennerstrand G., Wibom R.
Title Glare with outdoor high-mast illumination - Visual acuity and contrast sensitivity effects in studies on different floodlighting systems
Original title Bländning vid utomhus högmast-belysning - Effekter på synskärpa och kontrastkänslighet i jämförande studier över olika [in Swedish]
Bibliographic information Arbetarskyddsstyrelsen, Publikationsservice, 171 84 Solna, Sweden, 1983. 27p. Illus. 7 ref.
Abstract 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".
Descriptors (primary) floodlighting; contrast; glare; sawmilling industry; visual tasks
Descriptors (secondary) lighting; visual acuity; hand sorting
Document type E - Books, reports, proceedings
Subject(s) Lighting, colour and vision
Broad subject area(s)
Browse category(ies) Lumber and the woodworking industry
Non-ionizing radiation
Lighting and colour
Woodworking industry