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Related Experiment Videos

Fluctuations in accommodation: a review.

W N Charman1, G Heron

  • 1Department of Ophthalmic Optics, University of Manchester Institute of Science and Technology, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 1, 1988
PubMed
Summary

Eye accommodation shows small, regular fluctuations. These microfluctuations vary with viewing conditions and may play roles in visual system function, with different frequencies linked to mechanics or control.

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Physiological Optics

Background:

  • The steady-state accommodation response in young observers is not perfectly stable.
  • Small fluctuations, or microfluctuations, occur during sustained accommodation.
  • These oscillations have characteristic amplitudes and frequency spectra.

Purpose of the Study:

  • To describe the properties of accommodative microfluctuations.
  • To investigate how viewing conditions affect these fluctuations.
  • To discuss the functional significance of accommodative oscillations.

Main Methods:

  • Analysis of accommodative response fluctuations under varying conditions.
  • Measurement of oscillation frequency spectra.
  • Examination of factors including pupil diameter, target vergence, form, contrast, and luminance.

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  • Consideration of visual anomalies like amblyopia.

    • Main Results:

    • Viewing conditions such as pupil diameter, target vergence, form, contrast, and luminance significantly influence the frequency spectra of accommodative oscillations.
    • Visual anomalies like amblyopia can also affect these fluctuations.
    • Higher frequency components (around 2 Hz) may relate to the physical properties of the eye's optical components.
    • Lower frequency components (below 0.5 Hz) appear more relevant to the accommodative control system.

    Conclusions:

    • Accommodative microfluctuations are a normal aspect of visual function.
    • The characteristics of these fluctuations are modulated by external viewing parameters.
    • Different frequency components likely serve distinct roles in eye accommodation, with low frequencies potentially critical for control mechanisms.