All progressive lenses from Carl Zeiss are provided with permanent engravings. With the aid of a special chart, these can be used to reconstruct all  measurement and reference points as well as the horizontal axis of the lens.
The code number engraved directly under the temporal permanent engraving is used to determine the addition. A symbol for the lens type (e.g. a “T” for Gradal Top) is found under the nasal engraving and, where necessary, also a figure indicating the refractive index of the material used (e.g. “T66” for ZEISS Single Vision Sph 1.6 (Clarlet 1.6)7 Gradal Top with the refractive index 1.665).
Lens engravings and stamp with dimensions
(ZEISS Single Vision Sph 1.6 (Clarlet 1.6)7 Gradal Top)
Lens engravings and adittion in Gradal Top
| Symmetric
Horizontally symmetric
Variable inset
Thickness reduction prism
Engravings and stamp
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