Here at Swanwick, we regularly have our Day and Night Swannies lens transmission independently lab tested by Colts Laboratories. We believe in transparency when it comes to the science behind our Swannies Blue Light Blocking Glasses. That is why, when choosing where to purchase blue light blocking glasses, we recommend you check whether transmission reports from an independent testing facility are available.
Here's ours for you:
Night Swannies block over 99% of blue light between 400-500nanometers, and around 80% of green light from 400-550nm.
Day Swannies block 98% of blue light at 400 nanometers, graduating to 45% at 450nm (the most harmful part of the spectrum). Day Swannies also block between 21-45% of blue light between 450-500 nanometers.