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The effect of accommodation on ocular shape.

Terry W Walker1, Donald O Mutti

  • 1The Ohio State University College of Optometry, Columbus 43210-1240, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|July 26, 2002
PubMed
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Near work causes the eye

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Myopia is associated with altered ocular shape.
  • Near work and accommodation are implicated as risk factors for myopia development.
  • Understanding how accommodation influences ocular shape is crucial for myopia research.

Purpose of the Study:

  • To investigate the impact of sustained near work-induced accommodation on ocular shape.
  • To determine if accommodation directly alters relative peripheral refractive error (RPRE) and thus ocular shape.
  • To assess the reversibility of accommodation-induced ocular shape changes.

Main Methods:

  • Relative peripheral refractive error (RPRE) was measured in young adults using autorefraction.
  • RPRE was assessed at baseline, during sustained near work (3D stimulus), and after a period of accommodative relaxation.

Related Experiment Videos

  • Ocular shape changes were inferred from RPRE measurements at specific peripheral visual field locations.

    • Main Results:

    • Accommodation induced an immediate shift towards a more prolate ocular shape (hyperopic RPRE shift).
    • This prolate shape was maintained during sustained accommodation but returned to baseline after relaxation.
    • A transient shift towards a more oblate shape (myopic RPRE shift) was observed immediately after accommodative relaxation.

    Conclusions:

    • Accommodation dynamically alters ocular shape, inducing a transient prolate state.
    • The relaxation of accommodation leads to a transient oblate ocular shape.
    • Choroidal tension and hysteresis are proposed mechanisms influencing these accommodation-induced ocular shape changes.