Circadian eyeglass lenses—commonly referred to as blue blockers—are primary tools for managing light hygiene. The effectiveness of these lenses is color-coded: yellow lenses are optimized for daytime performance and visual clarity, while orange lenses are specialized for melatonin protection and evening sleep preparation.
Yellow Lenses: Daytime Performance & Focus
Yellow-tinted lenses are designed for use during the day, specifically in offices or environments with harsh artificial lighting.
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Enhanced Contrast: They amplify depths and contrast, which reduces visual fatigue during detailed digital work or while driving in hazy/low-light conditions.
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Reduced Digital Eye Strain: By filtering 50–70% of high-energy blue light (around 400–450nm), they alleviate "computer vision syndrome" symptoms like dry eyes, headaches, and blurred vision.
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Mood Boosting: The warm yellow tint can help combat Seasonal Affective Disorder (SAD) and induce a more relaxed mental state during stressful tasks.
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Maintains Alertness: Unlike darker tints, yellow lenses allow "beneficial" blue light (455–500nm) to pass through, which is necessary during the day to maintain energy and hormonal balance.
