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Visual acuity testing with preferential looking in mental retardation.

G Lennerstrand, A Axelsson, G Andersson

    Acta Ophthalmologica
    |August 1, 1983
    PubMed
    Summary
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    Visual acuity testing using preferential looking is effective for assessing vision in children and young adults with intellectual disabilities. This method accurately identifies visual impairments and correlates well with ophthalmological findings.

    Area of Science:

    • Ophthalmology
    • Developmental Neuroscience

    Background:

    • Assessing visual acuity in individuals with intellectual disabilities and neurological deficits presents significant challenges.
    • Traditional visual acuity tests may be unreliable in this population due to cooperation issues.

    Purpose of the Study:

    • To evaluate the efficacy of the 'operant preferential looking' technique for determining binocular visual acuity in mentally retarded children and young adults.
    • To correlate visual acuity measurements with ophthalmological findings in this cohort.

    Main Methods:

    • Ophthalmological examinations were conducted on 26 individuals aged 5-24 years with intellectual disabilities and neurological deficits.
    • Binocular visual acuities were measured using the 'operant preferential looking' (PL) technique.
    • Correlation analysis was performed between PL results and ophthalmological findings (fixation, pupillary responses, motility, fundus, refraction).

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    Main Results:

    • Visual acuity was successfully measured in 21 out of 26 subjects, with results ranging from 1.29 to 0.03.
    • Two children with high myopia showed significant visual acuity improvement with corrective lenses.
    • Poor visual acuity (≤0.15) was associated with inability to fixate, and acuities (≤0.28) were observed in cases of optic atrophy.
    • A strong correlation was found between ophthalmological abnormalities and reduced visual acuity.

    Conclusions:

    • The 'operant preferential looking' technique provides valid and reliable information on central visual function in mentally retarded children and young adults.
    • This method aids in identifying visual impairments and guiding appropriate interventions in this population.
    • Ophthalmological assessment combined with PL testing is crucial for comprehensive visual evaluation.