[SECURE CLIP-ON CONSTRUCTION] - Designed with a spring draw bar structure

Frame width about 5 1/16 inches (129mm)

Flex Combinations - The range of lens strength combinations are from 0 strength (plano) to 4

Lens height about 17/16 inches (37mm)

Width of the forehead frame:14cm/5

Oval Blue Light Blocking Reading Glasses 5-TMCG144 feed-cl0-Multifocal Glasses [SECURE CLIP-ON CONSTRUCTION] - DesignedThe 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. The lenses block 30% blue color of online test for color filtering properties. 100% UV protection. 20% color distortion due to 30% blue color was filtered out.