Why do bright lights burn our eyes?
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Light carries energy. When it hits something, that energy gets transferred in part. Light is electromagnetic radiation after all.
Your cells can only take so much energy before they get damaged.
Our eyes evolved to be sensitive enough to work in normal lighting conditions on earth. That sensitivity goes both way, there’s only so much light our eyes can take. It was better for our eyes to be more sensitive than be able to take looking directly at the sun for example.
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