Pupil shapes and lens optics in the eyes of terrestrial vertebrates

@article{Malmstrom2006PupilSA,
  title={Pupil shapes and lens optics in the eyes of terrestrial vertebrates},
  author={Tim Malmström and Ronald H.H. Kr{\"o}ger},
  journal={Journal of Experimental Biology},
  year={2006},
  volume={209},
  pages={18 - 25}
}
SUMMARY Animal eyes that are primarily used under low-light conditions usually have optical systems of short depth of focus, such that chromatic defocus may lead to considerable blurring of the images. In some vertebrates, the problem is solved by multifocal lenses having concentric zones of different focal lengths, each of which focuses a different relevant spectral range onto the retina. A partially constricted circular pupil would shade the peripheral zones of the lens, leading to the loss… 
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