Visual performance assessment through clear and sunscreen-treated windows
Kenneth W. Welsh, P. G. Rasmussen, John A. Vaughan, United States. Office of Aviation Medicine, Civil Aeromedical Institute
U.S. Dept. of Transportation, Federal Aviation Administration, Office of Aviation Medicine, 1978 - Technology & Engineering - 14 pages
Reflective sunscreen filters are frequently bonded to vehicle windows to reduce interior heat and brightness. The present study was conducted to investigate the optical properties of and visual performance through clear and sunscreen-treated glass panels that served as windows in an observation booth. Five combinations of external and internal brightness levels were used. Light transmission values through the clear, gold, silver, and bronze panels were 92, 20, 18, and 8 percent, respectively. Visual performance tests were conducted at 6 m (20 ft) on 12 subjects with normal visual acuity and color vision. Two tasks were conducted under brightness levels on the external display and in the subject's booth, respectively, of 1:1, 5:1, 50:1, 5:5, and 50:5 fL. Visual acuity using Landolt C figures and scores on a contour identification task were minimally impaired for any luminance ratio when the clear (control) panel was used. With the sunscreen panels, scores on both tests decreased as a function of target brightness and panel density. With one external/internal luminance ratio(5:1), identification of signal light colors was generally impaired while viewing through sunscreen materials. Decreases were particularly evident for green and red lights presented at intermediate and low intensity levels. (Author).
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acuity levels airplane ambient brightness ASSESSMENT THROUGH CLEAR Aviation background bronze panels CLEAR AND SUNSCREEN-TREATED clear panel cockpit contrast discrimination daylight-blue bulb decreased evaluated external/internal luminance ratio figure-to-ground contrast ratios five luminance ratios frequently bonded gray Pantone gray targets H 4J heat and brightness i-l H identify illumination internal brightness level Landolt C figures Lantern Light transmission values light-gray lights presented low intensity levels luminance ratio 5:1 moderately dim negative contrast ratio observation booth Oklahoma panels were 92 paper Pantone percent Pritchard Spectra photometer ratio when viewed recognition value reduce Reflective sunscreen Relative spectral energy scores selected luminance levels side windows signal light colors silver square or diamond subjects sunglasses sunscreen materials sunscreen panels SUNSCREEN-TREATED WINDOWS target luminance level tasks were conducted Test figures displayed three aperture sizes three panels three signal light three sunscreen treated window viewing through sunscreen visual acuity VISUAL PERFORMANCE ASSESSMENT