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Related Experiment Video

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The Optokinetic Response as a Quantitative Measure of Visual Acuity in Zebrafish
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OKN-Fast: Objective visual acuity threshold measurement using the optokinetic response.

Jason Turuwhenua, Zaw LinTun, Mohammad Norouzifard

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |December 12, 2023
    PubMed
    Summary

    OKN-Fast, an automated visual acuity (VA) test using optokinetic nystagmus (OKN), reduces testing time and shows promise for non-verbal individuals. Further optimization is needed for accurate visual function assessment.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Biomedical Engineering

    Background:

    • Visual acuity (VA) is crucial for assessing visual function but difficult to measure in non-verbal patients.
    • Objective methods are needed to overcome limitations of subjective VA testing in specific populations.

    Purpose of the Study:

    • To introduce and evaluate OKN-Fast, an automated method for estimating VA using optokinetic nystagmus (OKN).
    • To assess the efficiency, repeatability, and correlation of VA-OKN with standard methods in healthy adults.

    Main Methods:

    • Developed OKN-Fast, an automated system measuring VA via optokinetic nystagmus (OKN) without verbal responses.
    • Tested OKN-Fast on 12 healthy adults, with and without induced blur, comparing results to ETDRS charts.

    Main Results:

    • OKN-Fast halved the number of trials needed for threshold determination compared to standard assessment.
    • VA measurements were similar between OKN-Fast and ETDRS when eyes were blurred, but a bias was noted in good vision.
    • VA-OKN demonstrated high repeatability, comparable to blurred ETDRS charts, but showed moderate correlation (r²=0.55) with ETDRS.

    Conclusions:

    • OKN-Fast offers an efficient, objective approach for visual acuity estimation, particularly beneficial for non-verbal populations.
    • Further refinement of the VA-OKN method is recommended to improve accuracy and correlation with established visual acuity charts.