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Related Experiment Videos

Accommodative facility in eyes with and without myopia.

Ashok Pandian1, Padmaja R Sankaridurg, Thomas Naduvilath

  • 1Vision Co-operative Research Centre, Level 4 Rupert Myers Building, Sydney, NSW 2052, Australia.

Investigative Ophthalmology & Visual Science
|October 27, 2006
PubMed
Summary
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Myopic eyes exhibit reduced distance accommodative facility and slower accommodative responses. However, accommodative facility testing lacks the power to distinguish myopia from other refractive errors.

Area of Science:

  • Ophthalmology
  • Refractive Error Research
  • Visual Optics

Background:

  • Myopia is a prevalent refractive error affecting visual acuity.
  • Understanding the functional characteristics of the eye, such as accommodative facility, is crucial for myopia research.
  • Previous studies have explored various factors associated with myopia, but the role of accommodative facility requires further investigation.

Purpose of the Study:

  • To compare accommodative facility in myopic eyes versus emmetropic or hyperopic eyes.
  • To determine if accommodative facility can predict an association with myopia.

Main Methods:

  • The Sydney Myopia Study assessed accommodative facility in school children (aged 6.7 years) at distance and near using semiautomated flippers.
  • Refractive error was classified as myopia (≤ -0.50 D), emmetropia (> -0.50 D to < +1.50 D), or hyperopia (≥ +1.50 D) based on postcycloplegia readings.

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  • Statistical analysis involved the Brown-Forsythe F test and Games-Howell adjustment for multiple comparisons.

    • Main Results:

    • Of 1328 eyes, 1.5% were myopic, 73.6% emmetropic, and 24.9% hyperopic.
    • Myopic eyes showed significantly reduced distance accommodative facility (5.5 cpm vs. 6.9 cpm for others, P=0.005).
    • Myopic eyes had slower accommodative response times to positive and negative defocus (P<0.05), with no difference in near facility.

    Conclusions:

    • Myopic eyes demonstrate diminished accommodative facility at distance and slower accommodative responses.
    • Accommodative facility testing, while showing differences, does not possess sufficient discriminatory power to reliably identify myopia among other refractive errors.