Head Size: Medium

Lens height: 1 7/16 inches (37mm)

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

Head size: Narrow

4 Pack Cool Modern Bifocal Reading Sunglasses SBR2108 Magnification Strength:+1.50 Head Size: MediumPlastic frame with spring hinges Frame width about 5 7 16 inches (138mm) Lens width about 1 7 8 inches (48mm) Lens height about 1 9 16 inches (40mm) Bridge (DBL) about 1 2 inches (12mm) Temple length about 5 5 16 inches (135mm) 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 is for distance viewing.