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Related Experiment Videos

Amplitude of accommodation and refractive error.

N A McBrien, M Millodot

    Investigative Ophthalmology & Visual Science
    |July 1, 1986
    PubMed
    Summary

    Late onset myopes exhibit the greatest amplitude of accommodation, surpassing early onset myopes, emmetropes, and hyperopes. This finding offers insights into the dual innervation of the ciliary muscle.

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    Area of Science:

    • Ophthalmology
    • Optometry
    • Vision Science

    Background:

    • Accommodation, the eye's ability to focus on near objects, is crucial for clear vision.
    • Variations in accommodative amplitude across different refractive error groups are not fully understood.
    • Understanding these differences may elucidate underlying mechanisms of visual function.

    Purpose of the Study:

    • To investigate and compare the amplitude of accommodation in individuals with early onset myopia, late onset myopia, emmetropia, and hyperopia.
    • To explore potential differences in accommodative function related to refractive error development.

    Main Methods:

    • Eighty young adults (18-22 years) with optimal refractive correction (20/20 or better visual acuity) were recruited.
    • Participants were categorized into four groups: early onset myopes, late onset myopes, emmetropes, and hyperopes.
    • The amplitude of accommodation was measured for each participant.

    Main Results:

    • Significant differences in the amplitude of accommodation were observed among the four refractive groups.
    • Late onset myopes demonstrated the largest amplitude of accommodation.
    • The order of accommodative amplitude was: late onset myopes > early onset myopes > emmetropes > hyperopes.

    Conclusions:

    • Refractive error is associated with significant differences in accommodative amplitude.
    • The findings suggest a potential link between the development of myopia and altered accommodative function.
    • Results are discussed in relation to tonic accommodation, accommodative response gradient, and dual ciliary muscle innervation.

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