00220118

Component

http://onlinepubs.trb.org...rbbulletin/336/336-005.pdf

ONE FACTOR TO BE CONTROLLED IN DARK ADAPTATION TESTING IS THAT OF FIXATION SO THAT THE REGION OF THE RETINA UNDER INVESTIGATION IS KNOWN AND CONSTANT. TO CONTROL THE ORIENTATION OF THE LINE OF SIGHT OF THE NONFIXATING EYE, WHICH IS UNDERGOING THE TEST WHILE THE OTHER EYE IS FIXATING, IT IS NECESSARY TO HOLD ACCOMMODATIVE CONVERGENCE CONSTANT AND TO PROVIDE A COMPENSATORY CORRECTION FOR THE RELATIVE DEVIATION OF THE TWO EYES UNDER DISSOCIATION. A BIO-PHOTOMETER WAS MODIFIED TO MEASURE THE DARK ADAPTATION OF ONE EYE WHILE ITS ORIENTATION WAS CONTROLLED BY THE FIXATION OF THE OTHER EYE. PRELIMINARY TESTING OVER A 10 MINUTE RANGE ON A SMALL SAMPLE OF SUBJECTS SUGGESTS THAT RELATIVELY GOOD RELIABILITY IS ATTAINABLE, AND THAT THE TEST-RETEST RELIABILITY REACHES A MAXIMUM AT ABOUT THE SIXTH MINUTE FOLLOWING THE END OF THE BLEACH PERIOD. REPORTS OF THE SUBJECT INDICATE THAT THE VISIBILITY JUDGMENTS ARE REMARKABLY EASIER TO MAKE BY THIS TECHNIQUE.

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01410717

pp 33-36

1962

Highway Research Board Bulletin

41st Annual Meeting of the Highway Research Board

Digital/other

Figures (4) ; References (2)

Eye; Eye fixations; Night; Photometers; Psychological adaptation; Reliability; Testing; Visibility

Orientation

Highways; Safety and Human Factors

TRIS, TRB, ATRI

Jun 15 1970 12:00AM

• AN IMPROVED INSTRUMENT FOR MEASUREMENT OF PAVEMENT MARKING REFLECTIVE PERFORMANCE
• AN INSTRUMENT FOR ASSESSMENT OF VISIBILITY UNDER HIGHWAY LIGHTING CONDITIONS
• EFFECTS OF AGE ON PERIPHERAL VISION
• FLICKER FUSION, DARK ADAPTATION AND AGE AS PREDICTORS OF NIGHT VISION
• GLARE SCREEN FOR DIVIDED HIGHWAYS
• LENSES FOR NIGHT DRIVING
• RELATION OF VISUAL ACUITY AND CONTRAST SENSITIVITY UNDER NIGHTTIME DRIVING CONDITIONS
• REQUISITE LUMINANCE CHARACTERISTICS FOR REFLECTIVE SIGNS
• ROADWAY DELINEATION WITH CURB MARKER LIGHTS
• TRAFFIC OPERATIONS AND DRIVER PERFORMANCE AS RELATED TO VARIOUS CONDITIONS OF NIGHTTIME VISIBILITY
• TRANSIENT ADAPTATION OF THE EYES OF A MOTORIST
• U.S. STANDARD FOR THE COLOR OF SIGNAL LIGHTS
• VISION AT LEVELS OF NIGHT ROAD ILLUMINATION VI LITERATURE 1960
• VISION AT LEVELS OF NIGHT ROAD ILLUMINATION VII LITERATURE 1961
• VISUAL DATA ON ROADWAY LIGHTING