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Related Experiment Video

Updated: Jul 31, 2025

Subjective Refraction Test Using a Smartphone for Vision Screening
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Does the smartphone's eye protection mode work?

Wenqian Xu, Peiyu Wu, Qi Yao

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    Summary

    Smartphone eye protection modes reduce circadian disruption but lower image quality. This study reveals a trade-off between screen comfort and visual fidelity for phone users.

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    Area of Science:

    • Display technology
    • Human-computer interaction
    • Chronobiology

    Background:

    • Increased smartphone usage leads to eye strain and circadian rhythm disruption.
    • Most smartphones feature an
    • eye protection mode
    • claiming to mitigate these negative effects.

    Purpose of the Study:

    • To evaluate the effectiveness of smartphone eye protection modes.
    • To investigate the impact on color quality and circadian rhythm disruption.

    Main Methods:

    • Assessed color quality (gamut area, just noticeable color difference) and circadian effect (equivalent melanopic lux, melanopic daylight efficacy ratio).
    • Compared iPhone 13 and HUAWEI P30 in normal and eye protection modes.

    Main Results:

    • Eye protection mode reduced color quality (gamut area decreased) and circadian impact (EML and MDER decreased).
    • A trade-off exists: improved nighttime circadian effect comes at the cost of image quality.

    Conclusions:

    • Smartphone eye protection modes benefit nighttime circadian health but compromise visual display quality.
    • This study offers a method for assessing display image quality and circadian effects, highlighting their inverse relationship.