BackgroundBlue light from electronic devices enriched with a peak at 456 nm affects circadian rhythm and antioxidant balance of skin, necessitating the study of photoprotection against the 456‐nm blue light.AimsThis study aims to report that blue light (456 nm) can cause skin pigmentation and proposes a new clinical evaluation method for blue light (456 nm) protection based on the skin pigmentation level.Patients/MethodsWe developed a clinical device (ABC deviceTM) that emits blue light (peak = 456 nm). Based on the minimal persistent pigment darkening dose (MPPD) determined from visual evaluation and melanin index measurements, we proposed the “protection grade of blue light (PB)” guideline to assess the protective ability of skin against blue light.ResultsHuman skin irradiated with blue light (456 nm) showed a light dose‐dependent degree of pigmentation. The MPPD on unprotected and protected skin was 135 J/cm2 or 180 J/cm2 and 135‐225 J/cm2, respectively. The ABC device™ and the proposed clinical method were used to test the four blue light blocking assessments of TiO2. Consequently, the inorganic filter with TiO2 effectively blocked the blue light (456 nm). The AP product demonstrated the ability to block blue light by 1.15 times (PB = 1.15), which significantly lowered the melanin index of the skin after irradiation as compared to that of the unprotected skin (P < .001).ConclusionWe propose an objective clinical evaluation method for blue light protection. This study elucidates the properties of blue light blockers for customers suffering from blue light pollution.
Exposure to blue light derives from a variety of technologies, including computers, smartphones, televisions, and light-emitting diodes (LEDs); furthermore, sunlight contains a considerable amount of blue radiation. 1,2 Blue light from everyday electronic devices (eg, smartphones and tablet computers) is rich in short-wavelength light with peaks at 452-456 nm. 2 Blue light exists everywhere in daily life, but
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