I was recommended BluBlockers by an acroptologist when I had my eyes diluted for an eye exam.  If you ever have that done, you can't focus your eyes, so basically you are blind.  I was in New York City, not a fun place to be blind.

BluBlockers are lousy, first of all, in style.  They pinch your nose and look idiotic.  They remind of the rubbish you buy in Swap meets that sell Chinese junk.

BluBlockers are not good for the eyes either since they remind me of a weird "spectrum" color that made me dizzy.  I don't even think they block any UTA/UNC rays, so if you are in water or near a sandy beach, your eyes absorb dangerous light patterns.

Take it from me, invest in some actual Ophthalmology favored sunglasses.