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Related Experiment Videos

Convergence accommodation.

D Kersten, G E Legge

    Journal of the Optical Society of America
    |March 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    This study found that eye accommodation, the process of focusing, is linearly related to vergence angle but not lateral gaze. This convergence accommodation is consistent across different viewing conditions.

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    Area of Science:

    • Ophthalmology
    • Vision Science
    • Physiological Optics

    Background:

    • Accommodation is the eye's ability to change focus.
    • Convergence accommodation describes the accommodative response to binocular eye convergence.
    • Understanding these responses is crucial for visual function.

    Purpose of the Study:

    • To measure steady-state accommodation responses as a function of vergence angle and lateral gaze.
    • To investigate the relationship between convergence accommodation and lateral gaze direction.
    • To compare convergence accommodation with responses to other visual stimuli.

    Main Methods:

    • Utilized a binocular laser optometer for precise measurements.
    • Employed small speckle patterns as fusional stimuli in a dark field to isolate accommodation.

    Related Experiment Videos

  • Measured accommodation for vergence angles from 0 to 25 degrees and lateral gaze angles of +32, -32, and 0 degrees.
  • Main Results:

    • Average accommodation showed a linear relationship with vergence angle.
    • Accommodation response was independent of the angle of lateral gaze.
    • The mean convergence accommodation/convergence ratio was 0.9 diopters per meter-angle.
    • Night myopia was observed at reduced luminance, but not for convergence accommodation.

    Conclusions:

    • Convergence accommodation is primarily driven by vergence angle, not lateral gaze.
    • Laser-speckle targets provide a reliable method for studying convergence accommodation.
    • Convergence accommodation appears distinct from the mechanisms causing night myopia.