The “21 times a month” idea came from a 2016 study of nearly 32,000 men, plus a viral 2017 headline. The study used self-reported recall, so the results may be skewed. Evidence linking frequent ...
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Blue light is a high-energy part of visible light from the sun, screens, and light-emitting diode (LED) bulbs. Your cornea and lens don’t block blue light the way they block ultraviolet (UV) rays.
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