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Physiological pseudomyopia.

R Jones1

  • 1College of Optometry, Ohio State University, Columbus.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 1, 1990
PubMed
Summary
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Normally, accommodation does not fully relax when there is no stimulus, causing physiological pseudomyopia. This refractive error is due to accommodation

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Accommodation, the eye's ability to adjust focus, is crucial for clear vision.
  • Previous research indicates accommodation doesn't always fully relax, even without a visual stimulus.

Purpose of the Study:

  • To investigate the phenomenon of incomplete accommodative relaxation.
  • To define and explain physiological pseudomyopia.
  • To link accommodative behavior to refractive error shifts.

Main Methods:

  • Objective refraction was performed using plus fogging lenses.
  • Base-in prisms were employed to assess accommodative responses.

Main Results:

  • Findings confirmed that accommodation is not completely relaxed when the stimulus is zero.

Related Experiment Videos

  • This incomplete relaxation leads to a myopic shift in refractive error, termed physiological pseudomyopia.
  • The study identified two key accommodative features: proportional control and a non-zero rest focus.

    • Conclusions:

    • Physiological pseudomyopia arises from the eye's inherent accommodative control system.
    • The non-zero rest focus of accommodation contributes to this pseudomyopia.
    • Eliminating physiological pseudomyopia, such as during cycloplegia, may explain observed hyperopic shifts.