The Effect of Spectral Power Distribution of White Light-Emitting Diodes on Eye Fatigue

Abstract

This study investigates the effect of blue light emitted by phosphor-converted white light-emitting diodes (LEDs) on people s eye fatigue. We conducted an experiment in which participants performed a visual task under lighting conditions using a white LED (B-LED) in which blue light excites phosphors and white LEDs (V-LEDs) in which violet light excites two types of phosphors. One of the two V-LEDs had a spectral power distribution mimicking those of the sun (S-LED). During the experiment, we measured participants subjective eye fatigue, number of eye blinks, accommodation power and critical flicker frequency. The results of the subjective evaluation suggested that participants eye fatigue under the B-LED lighting was worse than under the S-LED or V-LED lighting. The results of the eyeblink and accommodation measurements suggested that participants eye fatigue under the B-LED lighting was worse than under the S-LED lighting. In the range of the white LEDs employed in our experiment, we found that participants eye fatigue under lighting conditions with a blue-light-excited white LED could be worse than under a violetlight-excited white LED. The results of the objective response measurements suggested that the fatigue of eye muscles is the principal factor causing subjective eye fatigue.

A quantization algorithm of visual fatigue based on underdamped second order stochastic resonance for steady state visual evoked potentials

“…In many cases, the scores of these subjective scales are regarded as the 'gold standard' (Heuer et al, 1989;Hayes et al, 2007). From an objective point of view, the existing fatigue quantitative methods, such as critical flicker frequency (Benedetto et al, 2013;Liu et al, 2021), EEG (Lee et al, 2021), and eye movement (Feng and Chen, 2021;Sugimoto et al, 2022), have a certain effect. Among them, CCA is often used to qualitatively or quantitatively analyze the fatigue of EEG signals.…”