ELI5- Why does it hurt when you run water over your eye but the liquid in around doesn’t

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It’s still water isn’t it? Shouldn’t it have the same effect

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The liquid in your eyes is not pure water. It is salt water with some mucus in it. You can actually taste how salt it is and feel that it is a bit sticky. This mixture feels perfectly normal for your eyes. However if you get pure water in your eyes then it is going to wash away the salt water and make it into fresh water. There is probably also lots of debris in the water which you might not see or feel but your eyes will notice it. The lower salinity and possibly the debris will cause your eyes to hurt. It is basically an evolutionary train to prevent you from doing that.

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