Boy do they block!  You can't really tell if they block any blue rays from your computer or other electronic devices but they do a good job of darkening your view.. I believe it requires some getting used to.  I can't say I love it (5 stars) but I am happy with them.  Quality construction, sturdy, and described accurately by the seller. Just be aware that they will darken your view as they are supposed to do.
My lenses are pretty wide and these fit over them with room to spare. Not contributing aesthetically perhaps, but surely providing good coverage for your eyes. Light and unobtrusive as well.
A must in the subtropical and tropical climate range if you want to avoid damaging exposure to your eyes from the sun's rays and electronic equipment at night..