Blue light from screens has emerged as a major health concern. Linked to eye strain, disrupted sleep, and migraines, it demands our attention. Pauline Cousseau, founder of the Polette eyewear brand, shares expert insights on its risks and proven protections. As screen time surges with computers, smartphones, and TVs, blue light—emitted by screens and LED bulbs—stands out in the light spectrum with its short wavelengths and high energy. Blue light consists of rays in natural light with wavelengths between 446 and 500 nm. The shortest, blue-violet wavelengths appear in sunlight but are amplified by screens and certain LED lights.
Exposure becomes risky after just 30 minutes, making protection essential for anyone spending hours in front of screens.
It stimulates the retina, suppressing melatonin production—a key hormone from the brain that regulates sleep-wake cycles. "Blue light keeps the brain in 'day' mode, hindering sleep preparation," notes Cousseau. This shifts our internal clock, reducing sleep quality and recovery from daily fatigue.
Video of the day:Screens are unavoidable, but blue light-blocking glasses offer a reliable defense. Brands like Polette, Edie&Watson, IZIPIZI, and Blueberry use patented yellow filters that cut emissions by up to 40%, easing eye fatigue and promoting restorative sleep after long screen sessions.
Those needing vision correction can get anti-blue light lenses from opticians.
Alternatives include screen filters—many smartphone apps provide this—or avoiding phone use in the dark, as experts advise.
*https://www.nature.com/articles/s41598-018-28254-8
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