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Related Experiment Videos

Effect of target proximity on the open-loop accommodative response.

M Rosenfield1, B Gilmartin

  • 1Schnurmacher Institute for Vision Research, SUNY/State College of Optometry, New York.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|February 1, 1990
PubMed
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Target proximity influences accommodative responses (AR) even without blur cues. Emmetropes showed higher proximally induced accommodation (PIA) than late-onset myopes (LOM) at close distances.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Accommodation is the eye's ability to adjust focus for different distances.
  • Understanding accommodative responses (AR) is crucial for vision correction and myopia progression research.
  • Proximal stimuli, cues from object proximity, can influence accommodation independently of blur.

Purpose of the Study:

  • To investigate the effect of target proximity on open-loop accommodative responses.
  • To compare accommodative adaptation in late-onset myopes (LOM) and emmetropes.
  • To determine if proximal stimuli influence accommodation when blur and vergence cues are controlled.

Main Methods:

  • Assessed open-loop accommodative responses (AR) using monocular viewing through pinholes.

Related Experiment Videos

  • Tested stimuli at 5 m (0.2 D) and 0.33 m (3 D) in 10 LOM and 10 emmetropes.
  • Measured tonic accommodation (TA) pre- and post-task to evaluate adaptation.

    • Main Results:

    • At 0.2 D, accommodation remained open-loop with no significant changes in TA or AR.
    • At 3 D, both groups showed increased AR, with emmetropes exhibiting higher proximally induced accommodation (PIA) than LOM.
    • Target proximity significantly influenced AR even when blur and vergence cues were stabilized.

    Conclusions:

    • Proximal stimuli play a significant role in modulating accommodative responses.
    • Emmetropes demonstrate a greater sensitivity to proximal cues compared to late-onset myopes.
    • These findings highlight the complex interplay of visual cues in the accommodative system.