Download or read book Luminance Thresholds During Dark Adaptation Following Preadaptation to Cathode Ray Tube Displays written by Robert M. Herrick and published by . This book was released on 1952 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the identification of the position of a luminous dial pointer as the threshold criterion, luminance thresholds were determined at various times during dark adaptation following preadaptation to Cathode Ray Tube displays. Each display consisted of a vertical trace line which traversed the cathode Ray Tube screen at one of three rates. Dark adaptation curves, obtained after adaptation to the different displays are superimposed; initial thresholds are relatively low ( -2.0 log millilamberts); and dark adaptation is essentially complete in five minutes. The findings are interpreted to indicate to indicate that in certain Air Force applications, viewing such displays causes a definite temporary loss in the observer's ability to read instrument dials and to perceive objects external to the aircraft.