Retro Spectacles Blue Light Filter Classic Design 5-UVR899 Magnification Strength:+3.50 Bridge (DBL): 11/16"(17mm)

Bridge (DBL): 11/16"(17mm)

Bridge (DBL) about 11/16 inches (17mm)

Lens width about 1 7/8 inches (47mm)

won't break easily

Retro Spectacles Blue Light Filter Classic Design 5-UVR899 Magnification Strength:+3.50 Bridge (DBL): 11/16"(17mm)The performance of blue light blocking: block 28% within 500nm,block 31% within 490nm,block 33% within 480nm,block 36% within 450nm 470nm,block 39% within 440nm,block 51% within 430nm,block 93% within 420nm,block more than 99% within 400nm 410nm. The lenses do not block blue color of online test for color filtering properties. 100% UV protection. Almost no color distortion. Transparent lenses with coating Blue light blocking glasses reduce eye strain,