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The ciliary body in accommodation.

R F Fisher

    Transactions of the Ophthalmological Societies of the United Kingdom
    |January 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    As people age from 15 to 45, ciliary muscle contraction force increases, while its movement remains constant. This impacts how the eye focuses, with zonular fibers stretching more to transmit increased force.

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    Area of Science:

    • Ophthalmology
    • Biomechanics
    • Human Physiology

    Background:

    • The ciliary muscle's role in eye accommodation is crucial for focusing.
    • Understanding age-related changes in the ciliary muscle is important for vision science.

    Purpose of the Study:

    • To investigate age-related changes in ciliary muscle contraction force and movement.
    • To analyze the relationship between ciliary muscle function and the aging process in the human eye.

    Main Methods:

    • Measurements of ciliary muscle ring radius change during accommodation.
    • Quantification of ciliary muscle contraction force (in gms) across different age groups.
    • Assessment of the myodioptre (force per dioptre) during accommodation and aging.
    • Evaluation of zonular fiber extensile properties and elasticity modulus.

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    Main Results:

    • Ciliary muscle ring radius change (0.8 mm) remains constant between ages 15 and 45.
    • Ciliary muscle contraction force increases from 0.8 to 1.2 gms between ages 15 and 45.
    • Myodioptre increases proportionally with accommodation amplitude and significantly with age, especially between 40-45 years.
    • Lens equator movement decreases with age, leading to increased zonular fiber stretching.
    • Zonular fibers show constant extensile properties (elasticity modulus 3.5 X 10(5)Nm-2) between ages 15 and 45.

    Conclusions:

    • Despite constant ciliary muscle movement, increasing contraction force with age affects accommodation.
    • Stretched zonular fibers transmit increased forces, compensating for reduced lens movement.
    • Age-related changes in ciliary muscle mechanics are significant for maintaining visual focus.