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Related Experiment Videos

The Elidice: new instrument for visual acuity self-screening

K Arundale, D J Faulkner, R A Weale

    The British Journal of Ophthalmology
    |July 1, 1977
    PubMed
    Summary

    A new low-cost electronic device, the Elidice, accurately screens visual acuity using Landolt-Cs, avoiding crowding effects. It

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    Area of Science:

    • Ophthalmology
    • Optometry
    • Medical Devices

    Background:

    • Visual acuity screening is crucial for early detection of vision impairment.
    • Conventional methods like Snellen charts have limitations, including crowding effects and issues with astigmatism.
    • A need exists for accessible, rapid, and reliable visual screening tools.

    Purpose of the Study:

    • To develop and evaluate a compact, low-cost electronic device (Elidice) for self-administered visual acuity testing.
    • To assess the performance of the Elidice compared to a standard Snellen chart.
    • To determine the suitability of the Elidice for screening specific populations, such as laser users.

    Main Methods:

    • Construction of a novel electronic device (Elidice) costing 25 pounds.
    • The Elidice utilizes a visual acuity test based on Landolt-C orientation detection.
    • 100 observers were tested using both the Elidice and a standard Snellen chart under clinical conditions.

    Main Results:

    • The Elidice test takes under five minutes to complete and avoids 'crowding' effects.
    • Overall agreement between the Elidice and Snellen chart was 87.8%.
    • The Elidice demonstrated an over-referral rate of 10.7% and an under-referral rate of 1.5% compared to the Snellen chart.

    Conclusions:

    • The Elidice is a cost-effective and efficient tool for visual acuity screening.
    • Its design overcomes limitations of traditional letter charts, being suitable for astigmatic observers.
    • The Elidice is particularly well-suited for regular screening of laser users for vision loss due to macular damage.

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