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Banks MS, Sprague WW, Schmoll J, et al. Why do animal eyes have pupils of different shapes?. Sci Adv. 2015;1(7):e1500391doi: 10.1126/sciadv.1500391.
Banks, M. S., Sprague, W. W., Schmoll, J., Parnell, J. A., & Love, G. D. (2015). Why do animal eyes have pupils of different shapes?. Science advances, 1(7), e1500391. https://doi.org/10.1126/sciadv.1500391
Banks, Martin S, et al. "Why do animal eyes have pupils of different shapes?." Science advances vol. 1,7 (2015): e1500391. doi: https://doi.org/10.1126/sciadv.1500391
Banks MS, Sprague WW, Schmoll J, Parnell JA, Love GD. Why do animal eyes have pupils of different shapes?. Sci Adv. 2015 Aug 07;1(7):e1500391. doi: 10.1126/sciadv.1500391. eCollection 2015 Aug. PMID: 26601232; PMCID: PMC4643806.
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Sci Adv. 2015 Aug 07;1(7):e1500391. doi: 10.1126/sciadv.1500391. eCollection 2015 Aug.

Why do animal eyes have pupils of different shapes?.

Science advances

Martin S Banks, William W Sprague, Jürgen Schmoll, Jared A Q Parnell, Gordon D Love

Affiliations

  1. Vision Science Graduate Program, University of California, Berkeley, Berkeley, CA 94720, USA. ; School of Optometry, University of California, Berkeley, Berkeley, CA 94720, USA.
  2. Vision Science Graduate Program, University of California, Berkeley, Berkeley, CA 94720, USA.
  3. Department of Physics and Biophysical Sciences Institute, Durham University, Durham DH1 3LE, UK.

PMID: 26601232 PMCID: PMC4643806 DOI: 10.1126/sciadv.1500391

Abstract

There is a striking correlation between terrestrial species' pupil shape and ecological niche (that is, foraging mode and time of day they are active). Species with vertically elongated pupils are very likely to be ambush predators and active day and night. Species with horizontally elongated pupils are very likely to be prey and to have laterally placed eyes. Vertically elongated pupils create astigmatic depth of field such that images of vertical contours nearer or farther than the distance to which the eye is focused are sharp, whereas images of horizontal contours at different distances are blurred. This is advantageous for ambush predators to use stereopsis to estimate distances of vertical contours and defocus blur to estimate distances of horizontal contours. Horizontally elongated pupils create sharp images of horizontal contours ahead and behind, creating a horizontally panoramic view that facilitates detection of predators from various directions and forward locomotion across uneven terrain.

Keywords: anatomy; aperture; blur; chromatic aberration; depth of field; evolution; eye; pupil; stereopsis

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