An Eagle's Eye: Quality of the Retinal Image
@article{Shlaer1972AnEE, title={An Eagle's Eye: Quality of the Retinal Image}, author={R. Shlaer}, journal={Science}, year={1972}, volume={176}, pages={920 - 922} }
The optical quality of a living eagle's eye was determined by an ophthalmoscopic method. The performance of the eye was substantially better than that reported for humans, but did not confirm some of the wilder claims made for such birds.
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T(u) = 1 [-sin (2cos-l "\ ) A2cos-l "\ ] where u is spatial frequency in cyc]es per radian, X is the wavelength of the light, and d is the diameter of the entrance pupil
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