#ELI5 Why is water see through?

I'd never thought about it like this. Wow.

@Jdreben so is it just dumb luck that the same eyes would work for our atmosphere? Or am I missing the point?
@Iwillyeah @Jdreben since the atmosphere is above the oceans, the light must first pass through it. So eyes could only evolve for a spectrum that passes both through air and water.
@tido that makes sense. If life had evolved on land perhaps the eye would have developed differently then.