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Related Experiment Videos

Static aspects of accommodation in human amblyopia.

K J Ciuffreda, S C Hokoda, G K Hung

    American Journal of Optometry and Physiological Optics
    |June 1, 1983
    PubMed
    Summary

    Human amblyopia (lazy eye) involves reduced accommodative controller gain and amplitude. Orthoptic therapy can improve vision, but deficits may persist, suggesting early visual experience impacts the sensory system.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Vision Science

    Background:

    • Amblyopia, or lazy eye, is a developmental disorder affecting visual acuity.
    • Accommodation, the eye's ability to focus on near objects, is crucial for clear vision.
    • Previous research suggests altered visual input during critical developmental periods can lead to amblyopia.

    Purpose of the Study:

    • To investigate the static aspects of accommodation in human amblyopia.
    • To identify specific accommodative abnormalities associated with amblyopia.
    • To explore the impact of orthoptic therapy and strabismic suppression on accommodative function.

    Main Methods:

    • Analysis of accommodative controller gain, stimulus/response curves, and amplitude in amblyopic eyes.
    • Assessment of depth of focus in relation to accommodative function.

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  • Comparison of accommodative function in amblyopic eyes, fellow eyes, and control groups (former amblyopes, strabismics).

    • Main Results:

    • Amblyopic eyes exhibited decreased accommodative controller gain, reduced stimulus/response curve slope, and diminished amplitude.
    • An increased depth of focus was observed in amblyopic eyes.
    • Orthoptic therapy demonstrated improvement in accommodative function.
    • Similar, though less severe, accommodative deficits were noted in the nondominant eyes of related subject groups.

    Conclusions:

    • Early and prolonged abnormal visual experience significantly impacts the sensory visual system, leading to accommodative abnormalities in amblyopia.
    • Orthoptic therapy can partially restore accommodative function, but complete recovery may not always be maintained.
    • Strabismic suppression may contribute to accommodative deficits in some individuals with strabismus and amblyopia.