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Related Experiment Video

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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
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Clinical Validation of an Afocal Optical System in Visual Acuity Testing.

Li En Evangeline Leong, Wei Wei Dayna Yong, Muhammad Azri Bin Razali

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |December 3, 2025
    PubMed
    Summary
    This summary is machine-generated.

    The Afocal Visual Acuity Test (AVAT) device, using an afocal optical system, shows lower variability and strong correlation with standard charts. This new method is a feasible alternative for accurate visual acuity measurement.

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    Area of Science:

    • Ophthalmology
    • Optical Engineering

    Background:

    • Visual acuity (VA) measurement is crucial in ophthalmology.
    • Conventional methods like Snellen and ETDRS charts have limitations in precision.
    • An afocal optical system offers potential for improved VA testing accuracy.

    Purpose of the Study:

    • To validate the feasibility of an afocal optical system for visual acuity measurement.
    • To compare the performance of the Afocal Visual Acuity Test (AVAT) device with traditional charts.
    • To assess the reliability and accuracy of the AVAT device.

    Main Methods:

    • An afocal optical system was integrated into the AVAT device.
    • Perceived optotype sizes were compared across AVAT, Snellen, and ETDRS charts at varied distances.
    • A prospective study involving 58 participants was conducted at a national university hospital.

    Main Results:

    • The AVAT device demonstrated lower variability in perceived optotype sizes compared to Snellen and ETDRS charts.
    • AVAT showed strong correlations with ETDRS (r=0.904) and Snellen (r=0.906) charts.
    • Receiver operating characteristic analysis indicated high diagnostic performance for AVAT (AUC=0.975).

    Conclusions:

    • The AVAT device, utilizing an afocal optical system, correlates well with conventional visual acuity tests.
    • The AVAT device shows promise as a feasible and accurate tool for visual acuity measurement.
    • Further research with larger sample sizes is recommended to confirm test-retest reliability.