I've worn "BluBlockers" in the past, and these glasses are nothing like them.  These give everything a freakish yellow tint that makes me nauseated.  I purchased similar sunglasses from GlobalSource, and they block blue light effectively without giving an excessive or unnatural yellow tint.  They are also provide a much brighter and glare-free image.  At less than 1/2 the cost of these, they were a better choice for me.