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⇱ Falcon visual sensitivity to grating contrast | Nature

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Abstract

The eye of a small falcon, the kestrel, is about half the size of the human eye and, if similar in all other respects, its visual acuity would also be expected to be about half that of the human. Here we report that the cut-off frequency (a measure of visual acuity) is twice the expected value and is the same for kestrel and human eyes. This remarkable visual performance is explained by anatomical features of the bird eye and the spherical pit of the deep fovea acting as the diverging element of a telephoto lens to magnify the image1,2. In the low-spatial frequency range, however, falcon contrast sensitivity is much less than that of humans for stationary patterns.

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References

  1. Snyder, A. & Miller, W. Nature 275, 127–129 (1978).

    Article  ADS  CAS  Google Scholar 

  2. Miller, W. H. Handbook of Sensory Physiology Vol. 7/6A, 114–122 (Springer, Berlin, 1979).

    Google Scholar 

  3. Reymond, L. & Wolfe, J. Vision Res. 21, 263–271 (1981).

    Article  CAS  Google Scholar 

  4. Patel, A. S. J. opt. Soc. Am. 56, 689–694 (1966).

    Article  ADS  CAS  Google Scholar 

  5. Fox, R., Lehmkuhle, S. W. & Westendorf, D. Science 192, 263–265 (1976).

    Article  ADS  CAS  Google Scholar 

  6. Fite, K. V. Brain Behav. Evol. 12, 97–155 (1975).

    Article  CAS  Google Scholar 

  7. Walls, G. L. The Vertebrate Eye (Cranbrook Institute of Science, Bloomfield Hills, Michigan, 1972).

    Google Scholar 

  8. Shlaer, R. Science 276, 920–922 (1972).

    Article  ADS  Google Scholar 

  9. Barlow, H. B. Photophysiology Vol. 2, 162–202 (Academic, New York, 1964).

    Google Scholar 

  10. Westheimer, G. Handbook of Sensory Physiology Vol. 7/2 (Springer, Berlin, 1972).

    Google Scholar 

  11. Pumphrey, R. J. in Biology and Comparative Physiology of Birds (ed. Marshall, A. J.) (Academic, New York, 1961).

    Google Scholar 

  12. Williams, D. S. & McIntyre, P. Nature 288, 578–580 (1980).

    Article  ADS  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Ophthalmology and Visual Science, Yale University School of Medicine, New Haven, Connecticut, 06510, USA

    Joy Hirsch

Authors
  1. Joy Hirsch

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Cite this article

Hirsch, J. Falcon visual sensitivity to grating contrast. Nature 300, 57–58 (1982). https://doi.org/10.1038/300057a0

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  • DOI: https://doi.org/10.1038/300057a0

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