why do our eyes hurt when looking directly at the sky in daylight even without sun? And why does it hurt when closing one eye?

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why do our eyes hurt when looking directly at the sky in daylight even without sun? And why does it hurt when closing one eye?

In: Biology
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Radiation from the sun comes in more forms than just visible light. Clouds obscure visible light, but the higher-energy electromagnetic radiation still pierces through. It’s why it is recommended to put on sunscreen even if it’s cloudy.