titanium and metal frame with spring hinge

which is for distance viewing

30% color distortion

Insures optical clarity

Retro Spectacles Blue Light Filter Classic Design 5-UVR899 Magnification Strength:+1.00 titanium and metal frame withThe 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,