… optical elements, of any material, unmounted, other than such elements of glass not optically worked. …
Explanatory notes
… optical elements, of any material, unmounted, other than such elements of glass not optically worked. 9001.10 ‑ … optical elements of glass of this heading and those of Chapter 70 it is necessary to determine whether or not they … faces (e.g., proof planes or optical flats for checking the flatness of a surface). (3) Ophthalmic lenses …