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Spatial aberrations and acuity in strabismus and amblyopia.

H E Bedell, M C Flom, R Barbeito

    Investigative Ophthalmology & Visual Science
    |July 1, 1985
    PubMed
    Summary

    Strabismic patients exhibit significant spatial uncertainty and distortion, impacting visual acuity. These spatial aberrations, not explained by fixation issues, are primary abnormalities in strabismus.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Visual Science

    Background:

    • Strabismus, or eye misalignment, is a common condition affecting visual development.
    • Reduced visual acuity is a frequent consequence of strabismus, but its underlying causes are not fully understood.
    • Spatial perception deficits may contribute to reduced visual acuity in strabismic individuals.

    Purpose of the Study:

    • To quantify spatial uncertainty and distortion in individuals with strabismus.
    • To investigate the relationship between spatial perception abnormalities and visual acuity in strabismic eyes.
    • To differentiate these spatial deficits from other potential causes like fixation instability.

    Main Methods:

    • Judgement of horizontal line position relative to a reference target was assessed.
    • Spatial uncertainty and distortion were measured in strabismic eyes with varying visual acuity.
    • Fixation stability and artificially reduced visual acuity in normal eyes were used for comparison.

    Main Results:

    • All 23 strabismic amblyopic eyes (visual acuity ≤ 20/40) and 20/22 squinting eyes (visual acuity ≤ 20/30) showed spatial uncertainty beyond normal limits.
    • Abnormal spatial distortion was present in 16 amblyopic and 10 squinting eyes.
    • The severity of spatial uncertainty and distortion correlated with visual acuity in deviated eyes.

    Conclusions:

    • Spatial uncertainty and distortion are primary abnormalities in strabismus.
    • These spatial deficits, rather than fixation issues, likely cause reduced visual acuity.
    • The extent of spatial aberrations directly influences the degree of visual acuity deficits in strabismic patients.

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