OSA's Digital Library

Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 39, Iss. 11 — Nov. 1, 1949
  • pp: 922–922

Contrast Discrimination Charts for Demonstrating the Effect of Anoxia on Vision

SELIG HECTH, CHARLES D. HENDLEY, SYLVIA FRANK, and SIMON SHLAER  »View Author Affiliations


JOSA, Vol. 39, Issue 11, pp. 922-922 (1949)
http://dx.doi.org/10.1364/JOSA.39.000922


View Full Text Article

Acrobat PDF (258 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

A test of visual contrast discrimination has been developed for demonstrating visual impairment due to anoxia at altitudes of 15,000 feet or above. It is made of photographically printed Landolt rings only slightly darker than their white background, and varying in contrast so as to cover the range just barely discriminated by different individuals at sea level and at altitude. Since moderate anoxia has little effect on vision in daylight, but causes a deterioration in contrast discrimination at twilight and night, the tests are designed to be viewed at a twilight brightness of about 0.1 millilambert. Trials with aviation cadets and other untrained persons have shown that the tests fulfill their purpose of demonstrating the effect of anoxia on vision. They also show the existence of large individual differences in the score at sea level and in the effect of altitude. The tests have been used in researches with skilled subjects on the effects of various procedures for producing anoxia, and have successfully given a quantitative measure of the resulting visual impairment.

Citation
SELIG HECTH, CHARLES D. HENDLEY, SYLVIA FRANK, and SIMON SHLAER, "Contrast Discrimination Charts for Demonstrating the Effect of Anoxia on Vision," J. Opt. Soc. Am. 39, 922-922 (1949)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-39-11-922


Sort:  Author  |  Journal  |  Reset

References

  1. R. A. McFarland and J. N. Evans, Am. J. Physiol. 127, 37 (1939).
  2. Wald, Harper, Goodman, and Krieger, J. Gen. Physiol. 25, 891 (1942).
  3. R. A. McFarland and M. H. Halperin, J. Gen. Physiol. 23, 613 (1940).
  4. McFarland, Halperin, and Niven, Am. J. Physiol. 142, 328 (1944).
  5. Hecht, Hendley, Frank, and Haig, T. Gen. Physiol. 29, 335 (1946).
  6. Hecht, Hendley, Shlaer, and Frank, Report No. 358 (Committee on Medical Research, Washington, 1944).
  7. A. Chapanis, J. Aviation Med. 17, 348 (1946).
  8. Otis, Rahn, Epstein, and Fenn, Am. J. Physiol. 146, 207 (1946).
  9. Barach, Fenn, Ferris, and Schmidt, J. Aviation Med. 18, 73 (1947).
  10. A. L. Barach et al., J. Aviation Med. 18, 252 (1947).

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited