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Inducing myopia, hyperopia, and astigmatism in chicks.

E L Irving1, M G Callender, J G Sivak

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

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|May 1, 1991
PubMed
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Researchers induced myopia and hyperopia in chicks using specialized goggles. This new method rapidly altered refractive states, suggesting vitreous chamber depth changes, not accommodation, are key to refractive development.

Area of Science:

  • Ophthalmology
  • Developmental Biology
  • Animal Models

Background:

  • Myopia and hyperopia are common refractive errors.
  • Previous methods for inducing refractive errors in animal models, such as soft contact lenses in chicks, have limitations, including slow induction and corneal flattening effects.
  • Understanding the mechanisms of refractive development is crucial for addressing visual impairments.

Purpose of the Study:

  • To develop a novel and efficient method for inducing myopia and hyperopia in newly hatched chicks.
  • To investigate the role of accommodation in refractive development.
  • To explore the structural changes in the eye responsible for induced refractive errors.

Main Methods:

  • Newly hatched chicks were fitted with custom goggles containing hard convex or concave contact lens inserts.

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  • Defocus was applied to the visual field from the day of hatching.
  • Refractive states and astigmatism were measured.
  • Structural changes, particularly vitreous chamber depth, were analyzed.

    • Main Results:

    • Rapid induction of myopia (+10 D) and hyperopia (+10 D) was achieved within 4-7 days using the goggle system.
    • Significant astigmatism (1-5 D) was induced using cylindrical lens inserts.
    • Spherical refractive errors were primarily associated with alterations in vitreous chamber depth.
    • Preliminary findings suggest accommodation is not involved in correcting cylindrical defocus.

    Conclusions:

    • The goggle system provides a rapid and effective method for inducing myopia, hyperopia, and astigmatism in chicks.
    • Vitreous chamber elongation or shortening is the primary mechanism for induced spherical refractive errors.
    • Accommodation may not play a significant role in early refractive development, especially when faced with complex defocus like astigmatism.