system
Given the following post, respond as if you're commenting on Reddit:
human
Do sea creatures (dolphins, fish, whales) see as well outside water as in it?

And what about, for instance, baluga whales in tanks that can see people through the glass. How well are they seeing them?
gpt
The reason we don't see well in water is because it has a different refractive index than air and our eyes can't adjust to it perfectly.  Goggles put air between our eyes and the water, thus allowing us to focus properly.  The tank glass effectively does the same thing.  Because the whales still look through water before they look through the air, they can focus on objects on the other side of the glass as well as they can on objects in the water.