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Related Experiment Videos

Visual acuity at different retinal loci of eccentrically fixating functional amblyopes.

D G Kirschen, M C Flom

    American Journal of Optometry and Physiological Optics
    |March 1, 1978
    PubMed
    Summary

    Amblyopic eyes show reduced visual acuity due to both sensory inhibition and motor control issues. The sensory component dominates with minor eccentric fixation, while the motor component is more significant with larger eccentric fixation.

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    Optometry and vision science : official publication of the American Academy of Optometry·1992

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Vision Science

    Background:

    • Amblyopia, or
    • lazy eye
    • , is a developmental disorder characterized by reduced visual acuity in one eye.
    • Eccentric fixation, where the amblyopic eye uses a retinal locus other than the fovea for fixation, is a common characteristic.
    • Understanding the components of acuity loss in amblyopia is crucial for developing effective treatments.

    Purpose of the Study:

    • To investigate the contributions of sensory (inhibitory) and motor (retinal-locus) components to visual acuity loss in amblyopic subjects with eccentric fixation.
    • To evaluate the validity of Worth's explanation for eccentric fixation in the studied amblyopic population.

    Main Methods:

    • Visual acuity was measured in 4 amblyopic subjects with eccentric fixation.

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  • Auditory feedback was employed to help subjects control unsteady and eccentric fixation.
  • Targets were presented at various eccentricities in the visual field, both flashed and continuously.

    • Main Results:

    • All amblyopic eyes exhibited maximum visual acuity at the fovea, with acuity declining symmetrically into the visual periphery.
    • Foveal acuity in the amblyopic eyes was significantly lower than in normal eyes.
    • The study concluded that Worth's explanation of eccentric fixation does not apply to these subjects.

    Conclusions:

    • Visual acuity loss in amblyopia comprises both sensory (inhibition) and motor (retinal-locus) components.
    • The relative contribution of these components varies with the degree of eccentric fixation.
    • Sensory inhibition is more dominant in cases of small eccentric fixation, whereas motor factors become more significant with larger eccentric fixation.