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.

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These sunglasses combine sharp geometry and precise detailing to a striking effect. The full-rim round rims have a double-layer construction, where glossy acetate is encased in a thin layer of brushed metal, for a subtle textural contrast. The theme continues with the enameled Flag temples and acetate-covered end tips, as well as tinted lenses, available in photochromic and mirrored variations.
Round full-rim sunglasses
A mix of ruthenium-tone metal and beige acetate
Enameled Flag temples engraved with Carrera’s signature
Gray nylon lenses with a bronze-tone mirrored coating
Can be fitted with prescription lenses
Adjustable silicone nose pads
Come in a complimentary storage case