Brown Blind spot-billed pelican lie down

I looked into what other kinds of pelicans dive. Turns out that the Brown Pelican is the only one that does. It occurs along the coasts of North America and beyond. Here's a video of one in action.

Most sources said that diving pelicans going blind was simply a myth. I haven't been able to figure out the origins of the story, although this article seems to propagate the story and I found someone who claimed she had seen blind pelicans in Costa Rica, but that was for an arts degree...