belongs to the normal phenomenon

Lens height about 1 9/16 inches(39mm)

Lens height about 1 inches (25mm)

Lens height about 17/16 inches (37mm)

Small Sports Bifocal Sunglasses TH6170-B feed-color-Grey/Green/Red belongs to the normal phenomenonPolycarbonate lens, TR90 and rubber frame without spring hinges Frame width about 5 1 2 inches (140mm) Lens width about 2 5 16 inches (59mm) Lens height about 1 1 2 inches (38mm) Bridge (DBL) about 3 8 inches (10mm) Temple length about 5 inches (125mm) EYEKEEPER BIFOCAL SUNGLASSES 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 magnification,which