Visibility of protective helmets worn by forestry workers.

Show simple item record Jacobs, Robert en De bock, J en Chouhan, RJ en 2013-01-10T03:25:53Z en 1998 en
dc.identifier.citation Clinical and Experimental Optometry 81:174-180 1998 en
dc.identifier.uri en
dc.description.abstract Background: High visibility helmets must be worn by Forestry workers in New Zealand for protection and as conspicuous ‘clothing’ to alert workers to the presence and location of other workers. The colours yellow-green (fluorescent yellow-green) and ‘water melon’ (fluorescent pink) are used and both appear to be conspicuous. To solve controversy, we investigated which helmet colour is more visible for use in a forest setting for workers having normal or defective colour vision. Method: We obtained threshold angular sizes for two-millimetre square samples met material presented against a textured background containing colours representative of those found in the foliage and bark of the most common forest type (Pinus Radiata). Observers with normal colour vision (n = 22) and with deutan (n = 8 and protan (n = 6) defects participated. Subjects with mild colour vision defects were excluded. Results: The yellow-green colour was significantly more visible than the pink for the normal (p < 0.001) and protan (p < 0.05) observers. For the deutan observers the pink helmet colour was significantly more visible (p < 0.01). The median equivalent out-door detection distances were for normal observers 400 m (pink) and 500 m yellow-green); for protan observers 185 m (pink) and 500 m (yellow-green); and for deutan observers 550 m (pink) and 450 m (yellow-green). Conclusions: The yellow-green helmet can be detected at large distances by all observers. The yellow-green helmet has greater reflectance and therefore greater luminance contrast. The pink helmet colour can be confused with green forest background colours by observers with protan defects. For some observers with a protan colour vision defect, detection distances for the pink helmet colour are less than half of normal detection distances. en
dc.relation.ispartofseries Clinical and Experimental Optometry en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained en
dc.rights.uri en
dc.title Visibility of protective helmets worn by forestry workers. en
dc.type Journal Article en
dc.identifier.doi 10.1111/j.1444-0938.1998.tb06776.x en
pubs.begin-page 174 en
pubs.volume 81 en
dc.rights.holder Copyright: Optometrists Association Australia en
dc.identifier.pmid 12482255 en
pubs.end-page 180 en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 34920 en Medical and Health Sciences en Optometry and Vision Science en
pubs.record-created-at-source-date 2010-09-01 en
pubs.dimensions-id 12482255 en

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