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The Gateway to the Brain: Dissecting the Primate Eye
07:37

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Published on: May 27, 2009

Evolution of eye size and shape in primates.

Callum F Ross1, E Christopher Kirk

  • 1Organismal Biology & Anatomy, University of Chicago, Chicago, IL 60637, USA. rossc@uchicago.edu

Journal of Human Evolution
|December 13, 2006
PubMed
Summary

Primate evolution involved changes in eye size and shape, with large eyes in early primates for nocturnal vision and smaller corneas in anthropoids for diurnal visual acuity. This research explores primate eye morphology evolution.

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Area of Science:

  • Comparative anatomy
  • Evolutionary biology
  • Primate morphology

Background:

  • Primates possess unique visual systems compared to other mammals.
  • Visual ecology shifts, from nocturnal to diurnal predation, are linked to primate evolution.
  • The extent of eye size and shape changes accompanying these ecological shifts is not fully understood.

Purpose of the Study:

  • To investigate the evolutionary changes in primate eye morphology.
  • To compare primate eye size and shape with other mammalian species.
  • To understand the relationship between visual ecology and eye evolution in primates.

Main Methods:

  • Comparative analysis of a large sample of mammalian eyes.
  • Examination of eye size relative to body size across species.
  • Analysis of corneal size relative to eye and body size.

Main Results:

  • Primates generally have larger eyes relative to body size than other mammals.
  • Anthropoids show reduced corneal size relative to both eye size and body size.
  • Large eyes in basal primates likely enhanced nocturnal vision; reduced anthropoid corneas improve diurnal visual acuity.

Conclusions:

  • Primate eye evolution is characterized by large eyes for nocturnal adaptation and reduced corneal size in anthropoids for diurnal hunting.
  • Changes in eye shape, particularly corneal size, are linked to improved visual acuity in anthropoids.
  • The origin of anthropoids was associated with significant modifications in eye morphology for diurnal predatory behavior.