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Related Experiment Videos

Bilateral experimental myopia in chicks.

J G Sivak1, D L Barrie, J A Weerheim

  • 1School of Optometry, University of Waterloo, Ontario, Canada.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|December 1, 1989
PubMed
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Bilateral visual deprivation in chicks induces myopia. Surprisingly, the eye with partial visual blur becomes significantly more myopic than the other eye, suggesting complex neural control of refractive development.

Area of Science:

  • Ophthalmology
  • Developmental Biology
  • Neuroscience

Background:

  • Myopia induction is achievable through visual deprivation in young animals.
  • Previous studies predominantly utilized unilateral visual deprivation models.
  • Understanding refractive development is crucial for addressing myopia prevalence.

Purpose of the Study:

  • To investigate the effects of bilateral visual deprivation on refractive development in chicks.
  • To compare the myopic effects of unilateral versus bilateral visual deprivation.
  • To explore the influence of varying visual deprivation levels on refractive error.

Main Methods:

  • Chicks were subjected to 2 weeks of post-hatching visual deprivation.
  • One eye was covered with an opaque goggle, the other with a translucent goggle.

Related Experiment Videos

  • Refractive states and lens focal characteristics were assessed.

    • Main Results:

    • Bilateral visual deprivation induced myopia in both eyes.
    • The eye under the translucent goggle exhibited greater myopia compared to the opaque-deprived eye.
    • Lens focal characteristics remained unaffected by the induced myopia.
    • Deprivation of one eye influenced the refractive development of the contralateral eye.

    Conclusions:

    • Partial visual blur during development can lead to more significant myopia than complete deprivation.
    • Contralateral eye effects suggest non-local neural mechanisms in refractive control.
    • Findings have implications for understanding central versus peripheral neural control of eye growth and refractive development.