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Related Experiment Videos

AC/A ratio, age, and refractive error in children.

D O Mutti1, L A Jones, M L Moeschberger

  • 1College of Optometry, The Ohio State University, Columbus 43210-1240, USA. mutti.2@osu.edu

Investigative Ophthalmology & Visual Science
|August 11, 2000
PubMed
Summary

An elevated accommodative convergence/accommodation (AC/A) ratio is linked to myopia development in children. This finding suggests the AC/A ratio is a significant risk factor for myopia onset.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • The accommodative convergence/accommodation (AC/A) ratio, a measure of the relationship between accommodation and convergence, is crucial for understanding binocular vision.
  • Variations in the AC/A ratio may influence refractive development and the onset of myopia.

Purpose of the Study:

  • To investigate the relationship between the response AC/A ratio, refractive error, and age in children.
  • To determine if the response AC/A ratio is a risk factor for myopia onset.
  • To explore the association between ocular structural features and the response AC/A ratio.

Main Methods:

  • Studied 828 children aged 6-14, measuring accommodation, refractive error, and convergence.
  • Utilized autorefraction, Purkinje image monitoring, video phakometry, topography, and A-scan ultrasonography.

Related Experiment Videos

  • Followed 726 non-myopic children for 1 year to assess myopia development.

    • Main Results:

    • The response AC/A ratio was significantly higher in myopes compared to emmetropes and hyperopes.
    • An elevated response AC/A ratio (≥5.84 delta/D) was a significant risk factor for myopia development within 1 year.
    • The AC/A ratio correlated with ocular structural features, notably refractive error and crystalline lens shape.

    Conclusions:

    • A high response AC/A ratio is associated with myopia and is a key risk factor for its rapid onset.
    • The findings suggest that ocular anatomical features, potentially leading to "pseudocycloplegia," may explain the link between elevated AC/A ratios and myopia.
    • Accommodative deficits in myopia could be a consequence of the eye's enlarged anatomy.