Defined by physical dimensions and hinge behaviour.
Lens width: 48 mm
Bridge width: 19 mm
Temple length: 140 mm
Frame width: approx. 142 mm
Proportioned for average adult face widths with balanced lens positioning for near-vision tasks.
Hinges
Type: Spring hinges
Allow controlled outward flex during wear and repeated use.
Weight
Approximate weight: 18 g (frame only) Low mass supports frequent on–off use typical of reading glasses.
