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Changing target size is a stimulus for accommodation.

P B Kruger, J Pola

    Journal of the Optical Society of America. A, Optics and Image Science
    |November 1, 1985
    PubMed
    Summary
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    Changing target size effectively stimulates accommodation, responding to both dioptric and nondioptric cues. This research utilized a high-speed infrared optometer under open-loop conditions to prevent visual blur during experiments.

    Area of Science:

    • Ophthalmology
    • Vision Science
    • Neuroscience

    Background:

    • Accurate focusing (accommodation) is crucial for clear vision.
    • The eye's accommodation system traditionally responds to blur (dioptric stimuli).
    • The role of other visual cues in accommodation is less understood.

    Purpose of the Study:

    • To investigate if changing target size alone can stimulate accommodation.
    • To determine if accommodation responds to nondioptric stimuli.

    Main Methods:

    • High-speed infrared optometry was used to monitor accommodation.
    • Subjects viewed a target with apparent sinusoidal motion (approaching/receding).
    • Open-loop conditions prevented accommodative blur, isolating stimulus effects.

    Related Experiment Videos

    Main Results:

    • Changing target size served as an effective stimulus for accommodation.
    • The eye's focusing system demonstrated responsiveness to size changes.
    • Accommodation was influenced by factors beyond just optical blur.

    Conclusions:

    • Accommodation is sensitive to both dioptric (blur) and nondioptric (size) stimuli.
    • Target size variation is a significant factor in the accommodation response.
    • These findings refine our understanding of the human visual system's focusing mechanisms.