1 Scope
This part of GB 27995 specifies requirements for the optical and geometrical properties of semi-finished progressive power spectacle lens blanks.
This part is applicable to semi-finished progressive power spectacle lens blanks.
Note: The requirements for semi-finished single-vision and multifocal lens blanks are given in GB 27995.1.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the reference document (including any amendments) applies.
Foreword I
1 Scope 1
2 Normative References 1
3 Terms and Definitions 1
4 Classification 3
5 Requirements 3
6 Test Method 5
7 Marking 6
8 Identification 6
9 Reference to this Part 7
