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That's weird. I experience the exact opposite. When I was younger I could keep my eyes open underwater in all sort of condition. Today, they sting like crazy even in fresh water.

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Well, fresh water would hurt a lot more than salt water ;)

Why ?

Because the osmotic difference between sea water and your bodily fluids is much lower than with fresh water.

Odd - It's been a long time since I've gone swimming in salt water, but I've never had any problems opening my eyes in fresh water.

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