I thought it was interesting that there are also sea nomad children who are able to see clearly underwater: http://www.bbc.com/future/story/20160229-the-sea-nom

I thought it was interesting that there are also sea nomad children who are able to see clearly underwater: http://www.bbc.com/future/story/20160229-the-sea-nomad-children-who-see-like-dolphins http://www.bbc.com/future/story/20160229-the-sea-nomad-child... Although that skill didn't evolve. It's just something kids can do with practice, and the ability is lost as we age and our lenses become less flexible.