Simply choose different strengths for your right eye and left eye

TR90 frame without spring hinges

Frame width about 55/16 inches (135mm)

Lens width about 1 7/8 inches (48mm)

Frame width about 5 5/16 inches (135mm)

Memory Frame Bifocal Blue Light Blocking Readers DSSG1801 feed-color-Red/Purple/Green Simply choose different strengths forAcrylic lens, metal frame with spring hinges Block 98% blue light, serious color distortion Frame width about 5 1 2 inches(140mm) Lens width about 2 5 16 inches (58mm) Lens height about 1 3 4 inches (45mm) Bridge about 1 2 inch (13mm) Temple length about 5 1 8 inches (130mm) EYEKEEPER BIFOCAL GLASSES A crescent shape on the bottom part of the lenses have magnification, which is for reading and close up work. And the other parts of the lenses have no