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Visual Recovery Times From High Intensity Flashes Of Light
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Book Synopsis Visual Recovery Times from High-intensity Flashes of Light by : Robert D. Metcalf
Download or read book Visual Recovery Times from High-intensity Flashes of Light written by Robert D. Metcalf and published by . This book was released on 1958 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A high-intensity carbon arc was used as a light source to determine the course of visual recovery after exposure to a level of illumination comparable to that likely to be encountered during nuclear operations. The subjects in the experiment were exposed to a source subtending 3°58' at the eye and with a luminance of up to 15 x 106 foot-lamberts. Exposure time was constant at 0.1 second. Recovery time plotted against illumination at the eye (and source brightness) produced a straight line curve in a semilog plot. Extrapolation to the estimated burn threshold indicates a maximum recovery time of 170 seconds to discriminate a brightness contrast comparable to reading red-lighted aircraft instruments. Recovery times to other brightness levels are also indicated."--Abstract
Book Synopsis Visual Recovery Times from High-intensity Flashes of Light by : Robert D. Metcalf
Download or read book Visual Recovery Times from High-intensity Flashes of Light written by Robert D. Metcalf and published by . This book was released on 1958 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Visual Recovery from High Intensity Flashes by : Norma D. Miller
Download or read book Visual Recovery from High Intensity Flashes written by Norma D. Miller and published by . This book was released on 1965 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: High intensity flashes of 0.04 msec to 1.4 msec duration were used to determine the afterimage brightness as a function of time following the flash. Six human subjects made continuous matches of the afterimage for periods up to six minutes following the flashes. The flash energies ranged from 3 x 10 to the minus 7th power to 800,000 td.sec or from 0.012 to 0.0003 cal/cm sq. at the retina, neglecting losses in the ocular media. The mean afterimage brightness, 5 sec following the highest intensity flashes, was 100,000 td. The afterimage brightness data were correlated with recovery time measurements for Sloan - Snellen letters presented at luminance levels from 280 mL to 0.07 mL. The reciprocity relationship between the duration and luminance of flashes subtending 7.5 degrees visual angle was investigated for constant flash energy of 3 x 10 to the minus 7th power td.sec. Seven flash durations from 0.5 to 5.0 msec were tested. The recovery times for the Sloan-Snellen letters at various luminance levels increased approximately 30% following 1.5 msec flashes compared with the 0.5 msec flashes. There was no apparent change for the mean recovery times for four subjects following flashes from 1.5 msec in duration.
Book Synopsis Visual Recovery from High-intensity Flashes of Light by : E. D. Metcalf
Download or read book Visual Recovery from High-intensity Flashes of Light written by E. D. Metcalf and published by . This book was released on 1958 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recovery of Visual Discrimination After High Intensity Flashes of Light by : Sanford L. Severin
Download or read book Recovery of Visual Discrimination After High Intensity Flashes of Light written by Sanford L. Severin and published by . This book was released on 1961 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new technic for the study of flash blindness is described, utilizing the Meyer-Schwickerath Zeiss light coagulator as a source of high intensity light flashes. Four subjects were exposed to illuminations ranging from 645 lux to 56,180 lux as measured at the corneal plane. Recovery was measured as the period of time required after dazzle to regain sufficient visual discrimination to perceive testing luminances of 0.06 ft.--L. and 0.013 ft.--L. The experimental results are discussed, and the potential of this apparatus in studying the phenomenon of flash blindness is emphasized. (Author).
Book Synopsis Visual Recovery from High Intensity Flashes II. by : N. D. Miller
Download or read book Visual Recovery from High Intensity Flashes II. written by N. D. Miller and published by . This book was released on 1966 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some new instrumentation was developed and a number of refinements were made in the existing special test equipment for investigating the visual recovery following high intensity flashes. The primary areas of apparatus modification were (1) increased capability for the measurement of source energy in absolute units, (2) increased precision in the measurement of recovery times, (3) extended range of flash durations for recovery measurements, and (4) inclusion of pupillographic recording as a measure of flash effect. The consensual pupil reflex was measured for six subjects for flash energies from 150,000 to 30,000,000 td.sec. The flash durations were varied from 250 microsec to 1.5 sec. Flash fields subtended a visual angle of 7.5 degrees in most of the work with a 2 degree centrally fixated field used in one part of the study.
Download or read book Medical News Letter written by and published by . This book was released on 1963 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report written by and published by . This book was released on 1965 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis United States Navy Medical Newsletter by :
Download or read book United States Navy Medical Newsletter written by and published by . This book was released on 1963 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Visual Simulation Techniques for Astronautical Flight Training by : T. F. Buddenhagen
Download or read book A Study of Visual Simulation Techniques for Astronautical Flight Training written by T. F. Buddenhagen and published by . This book was released on 1961 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1968 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Government Research Reports by :
Download or read book U.S. Government Research Reports written by and published by . This book was released on 1964 with total page 2180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Visual Recovery from Brief Exposures to Very High Luminance Levels by : G. A. Fry
Download or read book Visual Recovery from Brief Exposures to Very High Luminance Levels written by G. A. Fry and published by . This book was released on 1964 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design and calibration of the apparatus for delivering brief, high intensity flashes from a xenon-filled flash tube are described. A maximum field luminance of 4.6 x 10 to the 5th power lamberts was provided by the flash tube seen by Maxwellian view. A rotating mirror was synchronized with the flash tube discharge to produce exposure durations from 42 Mu sec to 1.4 msec. Field sizes could be varied from a point source to 10 degrees, and an adapting field optical system allowed the subject to be preadapted to various luminance levels before the flash was received. The criterion measure for recovery times following the flash was the correct identification of Sloan-Snellen test letters. Five different letter sizes were provided subtending visual angles from 41.9 to 10.2 minutes of arc. Some data are reported for five exposure durations of the flash and for five field sizes for the 20.3 minutes of arc tests letter at a luminance of 0.066 mL. (Author).
Book Synopsis Biological Effects of Infrared Radiation by :
Download or read book Biological Effects of Infrared Radiation written by and published by . This book was released on 1982 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SAM-TR. written by and published by . This book was released on 1967-07 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Night Visibility written by and published by . This book was released on 1962 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aerospace Medicine and Biology written by and published by . This book was released on 1966 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:
