Selection of filters for dark adaptation goggles in the photographic industry.
Two experiments were carried out to determine the effectiveness of several different types of dark adaptation goggles. Results of the first experiment suggest that persons who work in darkrooms illuminated with red safelights would obtain the greatest benefit by wearing goggles containing either a green filter or a neutral filter when engaged in activities outside the darkroom. On the other hand, persons who work in darkrooms illuminated with amber safelights should use a goggle device with a red filter or yellow-orange filter. The second experiment was undertaken to determine the savings in dark adaptation time that could be realised with neutral goggles of various densities and to determine their acceptability. Seventy-five percent (75%) of those persons interviewed indicated that they would be willing to use neutral goggles with a density of 1.0 (transmittance = 10%). These goggles reduced dark adaptation time by 60%.
Cushman
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Ergonomist, Eastman Kodak Co, Rochester, NY, USA.