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Related Experiment Videos

Open-loop accommodation in emmetropia and myopia.

N C Strang1, B S Gilmartin, L S Gray

  • 1Department of Optometry, University of Bradford, England.

Current Eye Research
|March 1, 2000
PubMed
Summary
This summary is machine-generated.

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Measurement method significantly impacts open-loop accommodation response, but refractive error does not. This study compared dark accommodation (DA) and pinhole accommodation (PA) in various refractive groups.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Accommodation is the eye's ability to change focus.
  • Open-loop accommodation measurements are crucial for understanding visual function.
  • Refractive errors like myopia can potentially influence accommodative responses.

Purpose of the Study:

  • To determine how measurement techniques affect open-loop accommodation.
  • To investigate if refractive error influences open-loop accommodation.
  • To compare dark accommodation (DA) and pinhole accommodation (PA) responses.

Main Methods:

  • Open-loop accommodation measured via dark accommodation (DA) and pinhole accommodation (PA).
  • Participants included emmetropes (EMMs), late-onset myopia (LOMs), and early-onset myopia (EOMs).

Related Experiment Videos

  • Measurements utilized a Canon R1 infra-red optometer; myopic subjects were corrected with soft contact lenses.

    • Main Results:

    • Significant differences in open-loop accommodation were observed between DA and PA (p < 0.001).
    • No significant variations in open-loop accommodation levels were found among the three refractive groups (EMMs, LOMs, EOMs).
    • No significant difference was noted between bright-field accommodation (BA) and DA levels across groups.

    Conclusions:

    • Experimental conditions, such as DA vs. PA, significantly alter open-loop accommodation measurements.
    • Refractive status (emmetropia, LOMs, EOMs) did not demonstrate a difference in open-loop accommodation responses.
    • Accommodation measurement methodology is a key factor in observed open-loop responses.