Welcome to a quick guide on how to purchase the correct size of designer sunglasses or optical frames online. I will give a quick example of rayban 3025 Aviator sunglasses.
58 - 14 - 135 <<<<<< You will usually see numbers like this on a listing eithier on ebay or a sunglasses store online and various companys do not describe what these mean.
Is it a colour code? NO
Its the size of the sunglasses you are planning to purchases. And this is what the numbers mean!
1st number 58mm this is the lens size, The lens Width
2nd number 14mm this is the bridge size, The bridge Width
3rd number 135mm this is the Arm size, The arm Length
So the summary
Lens width 58mm
Bridge width 14mm
Arm length 135mm
Hope this helps