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Related Experiment Videos

A pilot study on the use of visual field expanders

N Drasdo, I J Murray

    The British Journal of Physiological Optics
    |January 1, 1978
    PubMed
    Summary

    This study investigated visual difficulties in patients with contracted visual fields. Field expander devices may benefit some patients for continuous or occasional use, warranting further research.

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    Area of Science:

    • Ophthalmology
    • Low Vision Rehabilitation
    • Visual Optics

    Background:

    • Severely contracted visual fields significantly impair daily functioning.
    • High visual acuities in affected individuals may mask underlying visual field deficits.
    • Understanding the specific challenges is crucial for developing effective aids.

    Purpose of the Study:

    • To investigate the nature and magnitude of visual difficulties in patients with severely contracted visual fields.
    • To evaluate the potential utility of visual field expander devices.
    • To explore methods for assessing visual impairment and efficiency.

    Main Methods:

    • Utilized a questionnaire for quantitative visual impairment scoring.
    • Employed a specially devised visual search task to assess performance.
    • Applied an arbitrary method for estimating visual efficiency.

    Main Results:

    • Revealed and discussed various aspects of visual impairment associated with contracted visual fields.
    • Search task performance suggested field expanders could benefit a subset of patients for continuous wear (bioptic system).
    • Clip-on or hand-held devices may aid other patients for occasional use.

    Conclusions:

    • Visual field expander devices show potential for specific patient groups with contracted visual fields.
    • Manufacturing, dispensing, and patient selection were key limitations.
    • Further investigation and development of assessment methods and optical systems are recommended for larger trials.

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