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Updated: Sep 26, 2025

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Immediate Ocular Changes After Light-Emitting Diode Displays Exposure-A Preliminary Study.

Chia-Chen Lin¹, Jia-Horung Hung^1,2, Yi-Hsun Huang¹

¹Department of Ophthalmology, College of Medicine, National Cheng Kung University Hospital, National Cheng Kung University, Tainan, Taiwan.

Frontiers in Medicine

|April 21, 2022

Summary

Short-term exposure to light-emitting diodes (LED) improved computer vision syndrome (CVS) symptoms but reduced lipid layer thickness (LLT) in some users. Digital device users should be aware of potential negative ocular effects from LED screens.

Keywords:

computer vision syndrome (CVS)dry eye disease (DED)light-emitting diodes (LED)lipid layer thickness (LLT)video display terminals (VDT)

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Area of Science:

Ophthalmology
Digital Health
Human-Computer Interaction

Background:

Computer vision syndrome (CVS) is prevalent among video display terminal (VDT) users.
Limited research exists on the short-term ocular effects of light-emitting diode (LED) exposure.

Purpose of the Study:

To investigate the impact of short-term LED display exposure on corrected distance visual acuity (CDVA).
To assess changes in lipid layer thickness (LLT), blink rates, and partial blink ratio.
To evaluate the effect on computer vision syndrome questionnaire (CVS-Q) scores.

Main Methods:

Prospective, cross-sectional study design.
Participants underwent ocular examinations (CDVA, LLT, blink rates, partial blink ratio) and completed the CVS-Q.
Measurements were taken before and after a 15-minute exposure to an LED display.

Main Results:

No significant changes were observed in CDVA, LLT, blink rates, or partial blink ratio post-exposure.
Computer vision syndrome questionnaire (CVS-Q) scores significantly improved (P < 0.001).
Lipid layer thickness (LLT) significantly decreased in participants with a baseline LLT ≥60 nm (P = 0.016).

Conclusions:

Short-term LED use subjectively improved CVS symptoms.
LED exposure reduced LLT in individuals with a baseline LLT ≥60 nm.
Digital device users should be mindful of potential adverse ocular effects from LED screens.