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Related Experiment Video

Updated: Oct 4, 2025

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A Smartphone-Based Near-Vision Testing System: Design, Accuracy, and Reproducibility Compared With Standard Clinical

Do Gyun Kim, Aaron D Webel, Mark S Blumenkranz

    Ophthalmic Surgery, Lasers & Imaging Retina
    |February 11, 2022
    PubMed
    Summary
    This summary is machine-generated.

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    Smartphone vision monitoring systems like Sightbook accurately measure visual acuity and contrast sensitivity. This technology shows promise for supplementing in-office eye care, especially with increased telemedicine use.

    Area of Science:

    • Ophthalmology
    • Digital Health
    • Medical Technology

    Background:

    • The COVID-19 pandemic accelerated the adoption of telemedicine in ophthalmology.
    • Home-based vision monitoring systems offer potential solutions for remote patient care.

    Purpose of the Study:

    • To evaluate the accuracy and reproducibility of the smartphone-based Sightbook vision monitoring system.
    • To compare Sightbook's performance against established clinical ophthalmologic standards.

    Main Methods:

    • 200 patients underwent near Snellen visual acuity (VA) testing using Sightbook and conventional methods.
    • Contrast sensitivity was assessed in 30 patients (15 normal, 15 with AMD) using Sightbook and a commercial chart system.

    Main Results:

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    • Sightbook visual acuity tests demonstrated high reproducibility (SD = ±0.054 logMAR) and significant correlation with standard VA measurements (R > 0.87, P < .001).
    • Sightbook contrast sensitivity measurements were reproducible (SD/mean ratio, 0.02–0.04) and showed strong agreement with standard tests (R2 > 0.87, P < .001).

    Conclusions:

    • Smartphone-based systems provide accurate and reproducible measurements of visual acuity and contrast sensitivity.
    • These mobile health technologies can effectively augment limited in-office ophthalmologic care.