FILTER STUDY OF THE EFFECT OF CERTAIN TRANSMISSION FILTERS ON VISUAL ACUITY WITH AND WITHOUT GLARE
A STUDY WAS MADE OF 20 FILTERS, REPRESENTING AS MANY SPECIFIC WAVE BANDS THROUGHOUT THE VISIBLE SPECTRUM, TO DETERMINE THE RELATIONSHIP BETWEEN THE FILTER-TRANSMISSION FACTOR AND VISUAL ACUITY IN LOW ILLUMINATION WITH THE TEST OBJECT VIEWED THROUGH THE FILTER. FIFTEEN SETS OF MEASUREMENTS WERE MADE OF VISUAL ACUITY UNDER NORMAL CONDITIONS, AND FIFTEEN WERE MADE WITH OPPOSING LIGHT OR GLARE SOURCE, FOR A TOTAL OF 600 SEPARATE OBSERVATIONS. THE STUDY CONCLUDES THAT THERE SEEMS NO INDICATION THAT FILTERS BEFORE THE EYES CAN IN ANY WAY AID VISION AT LOW LEVELS OF ILLUMINATION. ANY MEDIA INTRODUCED BETWEEN THE EYE AND A STIMULUS OBJECT OR SITUATION ON A ROADWAY AS A MEANS OF REDUCING GLARE IS NOT TO BE RECOMMENDED FOR NIGHT-TIME OR ANY OTHER CONDITION WHICH LOWERS ACUITY WHEN MAXIMUM VISUAL EFFICIENCY IS DESIRED.
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Supplemental Notes:
- No 43, pp 45-51, 1 FIG, 2 TAB, 3 REF Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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Authors:
- Lauer, A R
- Publication Date: 1951
Media Info
- Media Type: Print
- Pagination: pp 45-51
- Monograph Title: Studies in night visibility
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Serial:
- Highway Research Board Bulletin
- Issue Number: 43
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Filters; Glare; Measurement; Night visibility; Tests; Transmissions; Vision
- Old TRIS Terms: Filter tests
- Subject Areas: Highways; Safety and Human Factors;
Filing Info
- Accession Number: 00222864
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Apr 28 1994 12:00AM