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Related Experiment Video

Updated: Apr 3, 2026

Eye Removal in Living Zebrafish Larvae to Examine Innervation-dependent Growth and Development of the Visual System
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Visually guided eye growth in the squid.

Philip R K Turnbull1, Simon Backhouse2, John R Phillips1

  • 1School of Optometry and Vision Science, The University of Auckland, Grafton, Auckland 1023, New Zealand.

Current Biology : CB
|September 23, 2015
PubMed
Summary

Squid eyes exhibit visually guided emmetropisation, adjusting growth to correct focus. This suggests complex vertebrate retinas may not be essential for preventing refractive errors like myopia.

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Area of Science:

  • Comparative physiology
  • Neuroscience
  • Developmental biology

Background:

  • Refractive errors, such as myopia, are increasingly prevalent in humans.
  • Vertebrate eyes have a complex retinal mechanism for emmetropisation, guiding eye growth to maintain focus.
  • The specific retinal neurons involved in vertebrate emmetropisation remain largely unknown.

Discussion:

  • This study investigates emmetropisation in the simpler, camera-type eye of the squid.
  • Longitudinal chromatic aberration (LCA) was used to induce differential focus in squid eyes.
  • Squid eye growth and refractive status were shown to be visually guided by light wavelength.

Key Insights:

  • Squid raised under orange light developed longer eyes and myopia compared to those under blue light.
  • Changes in eye size and refractive status were observed within days of switching light wavelengths.
  • This demonstrates visually guided emmetropisation in an invertebrate with a photoreceptor-only retina.

Outlook:

  • The findings challenge the necessity of complex vertebrate retinas for emmetropisation.
  • This research opens avenues for understanding the fundamental mechanisms of eye growth regulation.
  • Further studies could explore the molecular pathways involved in squid emmetropisation.