Spatial visual acuity of the eagle Aquila audax: a behavioural, optical and anatomical investigation

@article{Reymond1985SpatialVA,
  title={Spatial visual acuity of the eagle Aquila audax: a behavioural, optical and anatomical investigation},
  author={Liz Reymond},
  journal={Vision Research},
  year={1985},
  volume={25},
  pages={1477-1491}
}
  • L. Reymond
  • Published 31 December 1985
  • Medicine
  • Vision Research
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Behavioural determination of the contrast sensitivity function of the eagle aquila audax
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The relation of visual acuity and illumination for two trained observers was measured and the conclusion that detail perception is a function of a distance rather than an area is made.
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This behavioral test of falcon acuity supports the common belief that Falconiformès have superb vision, although Falcon acuity was much more dependent on lumanance, declining sharply with decreases in luminance.
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The results strongly suggest that the convexiclivate fovea is a device for achieving improved fixation and improved sensitivity to movement of objects in the visual field at some sacrifice of acuity.
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It was thought that in order for the eye to resolve two dots, their images should have an unstimulated cone between them, but this theory is no longer tenable.
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It is shown here that the presence of a spherical depression in the deep fovea of falconiforms may act like the negative lens component in a telephoto lens system or opera glass, thus providing the relatively large images necessary for more complete image reconstruction in a localised region of the retina.
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