Test via the spectrometer(the performance of blue light blocking): block 35% within 500nm, block 42% within 490nm, block 49% within 480nm, block 55% within 470nm, block 60% within 460nm, block 64% within 450nm, block 67% within 440nm, block 77% within 430nm, block 97% within 420nm, block more than 99% within 400nm-410nm.