The origins of BluBlocker® Sunglasses started with the NASA space program. Astronauts needed strong protection for their eyes in outer space where ultraviolet rays were much stronger than on earth.
A California sunglass manufacturer designed a pair that not only blocked UV rays but blue rays as well. By blocking blue rays, objects would appear sharper and clearer since blue light did not focus on the retina which is the focusing screen of your eye.
BluBlockers became a big hit and the company sold over 20 million pairs throughout the world on TV, through the QVC home shopping network and at retail in Walgreens drugstores.