TS EN ISO 13666

TS EN ISO 13666 is a vocabulary standard for the terminology used in spectacle lenses within ophthalmic optics. Standards of this kind help ensure that key expressions about lens geometry, optical power, surfaces, thickness, centration, coatings, and use-related concepts are understood consistently across design, manufacturing, testing, prescribing, and documentation. This listing represents a withdrawn edition.

Why spectacle-lens terminology matters

Spectacle lenses are optical elements intended for vision correction and other eyewear applications where prescribed optical characteristics matter. A vocabulary standard does not set performance limits by itself; instead, it defines the terms used to describe the product and its features. That matters because technical language in ophthalmic optics can be precise: distinctions such as front surface versus back surface, optical center, prism effect, or the way a lens is referenced in a specification can change how a product is designed, measured, or communicated.

What this kind of standard is used for

From its title, the standard is best understood as a terminology reference rather than a test method document. In practice, that means it supports consistent naming and definition of spectacle-lens concepts used in technical texts, product descriptions, and professional communication. It is especially valuable where multiple parties need the same words to carry the same meaning, reducing ambiguity in ophthalmic optics terminology.

• Supports consistent use of key spectacle-lens terms.
• Helps align technical communication across design, production, and documentation.
• Reduces ambiguity when the same concept is used in different professional contexts.
• Distinguishes spectacle-lens terminology from broader ophthalmic-optics vocabulary.