As far as blue light causing actual retinal eye damage, that claim has been debunked. There's no direct evidence (on living subjects) to support it.
But there's plenty of manufacturers out there willing to sell anyone Blue Light Blockers, just like there's plenty of manufacturers selling every vitamin supplement under the sun.
There's lots of websites parroting the original flawed research, but they're all referencing the same (flawed) conclusions.
Do more extensive searching on the Internet. You'll see