Frame size is determined by the three key measurements found inside the frame arm: lens width (from 31-60mm), bridge width (from 12-31mm), and arm length (from 115-155mm).
Your lens height (mm)
40
Lens height is essential for multifocal prescriptions, such as Progressives, which require a minimum measurement of 28-30mm. They are also recommended for Rx sunglasses.
The retro d-frame shape gets a modern makeover with the Derek Cardigan Birch glasses, which take the classic silhouette and strip it down with minimalistic details. Integrated nose pads and slimline arms keep it simple and versatile, while the raised nose bridge and wide wingtips maintain a throwback appeal.
Made from plastic, the Birch glasses are durable and comfortable, easy to pair with any outfit and slip on before heading out the door.
