Exact fit1 store
LCG Collection
Amira
from£12.95
Lens51 mm
Bridge18 mm
Temple138 mm
RoundPlasticUnisex
Exact-size results from the test feed
Your size. Every frame.One search.
Enter the three numbers printed inside your glasses. We compare real frames by lens width, bridge width and temple length.
How to read your size
50lens width
□17bridge
—140temple
Lens height is stored separately whenever a retailer supplies it.
LowCostGlasses test feed connected · 54 products
Glasses in 51-18-138
balanced lens fit, standard bridge, and standard-length arms · price and stock snapshot from 13 Sep 2026
1 matching framesExact sizes first
Size guide
What 51-18-138 means
The first number is the lens width (51 mm), the second is the bridge width (18 mm), and the third is the temple or arm length (138 mm). Lens height and total frame width are separate measurements because many retailers provide them independently.
Profile: balanced lens fit, standard bridge, and standard-length arms