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Morphological ciliary muscle changes associated with form deprivation-induced myopia.

Andrew D Pucker1, Ashley R Jackson2, Kirk M McHugh2

  • 1University of Alabama at Birmingham, School of Optometry, 1716 University Blvd, Birmingham, AL, USA.

Experimental Eye Research
|February 12, 2020
PubMed
Summary

Form deprivation myopia in guinea pigs did not thicken ciliary muscles, unlike in humans. This study suggests that induced myopia in guinea pigs leads to ciliary muscle atrophy or inhibited growth, not thickening.

Keywords:
Ciliary muscleDevelopmentGuinea pigsHistologyMyopiaRefractive error

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Area of Science:

  • Ophthalmology
  • Comparative Biology
  • Animal Models

Background:

  • Human myopia is associated with larger ciliary muscles.
  • The guinea pig is a potential model for studying myopia development.

Purpose of the Study:

  • To investigate if form deprivation-induced myopia in guinea pigs causes ciliary muscle thickening, mirroring human myopia.
  • To analyze ciliary muscle characteristics in response to induced myopia.

Main Methods:

  • Thirty-nine guinea pigs underwent form deprivation in one eye for 7 days.
  • Refractive error, vitreous chamber depth, and axial length were measured.
  • Ciliary muscle characteristics were analyzed histologically.

Main Results:

  • No significant inter-ocular differences in ciliary muscle variables were found between strains or overall.
  • Axially myopic guinea pigs showed reduced ciliary muscle length and smooth muscle actin concentration in treated eyes.
  • Form deprivation did not induce ciliary muscle thickening; it suggested atrophy or inhibited growth.

Conclusions:

  • Form deprivation myopia in guinea pigs does not replicate the ciliary muscle thickening observed in human myopia.
  • The study indicates potential ciliary muscle cellular atrophy or growth inhibition in response to short-term form deprivation in guinea pigs.