Glossary of Eye Definitions and Glasses Terms

Want to discover all things eyewear? Find out more about your eyeglasses and sunglasses, word by word.


Frame ID

Inscribed on the inside of the frames of sunglasses and eyeglass are a series of codes – this is the frame ID. The frame ID is composed of different variables, from the frame name and frame number to the size of the lenses. Each of the different frame types for glasses will have a distinct code included in the frame ID. When looking for a replacement pair of glasses, make sure you consult the frame ID to get a sense of the dimensions you are interested in.

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