You can find measurement A/B/C printed on the inside of the temple arm or on the nose pads.
If you already have a pair of glasses that you like, you can compare measurements to see how a certain style of ours will fit you.

Not available Online
With its fashionable flat-top shape and premium-quality polarized lenses, these unisex aviator sunglasses offer a truly modern way to shield your eyes from the harmful rays. The lightweight, durable, and hypoallergenic Optyl construction is tinged with a new seasonal colorway for extra style points, while a host of Carrera’s signature details round off the look with an understated yet undeniably cool touch.
Unisex sunglasses with full-rim aviator frames
Sculpted from brown Havana Optyl
Carrera’s signature along both arms and on the left lens
Green polycarbonate lenses with anti-reflective polarized coating
Can be fitted with prescription lenses
Molded nose pads
Come in a complimentary storage case