Standard No.:	GB 27995.1-2011
English Name:	Semi-finished spectacle lens blanks - Part 1: Specifications for single-vision and multifocal lens blanks
Chinese Name:	半成品眼镜片毛坯 第1部分：单光和多焦点眼镜片毛坯规范
Chinese Classification:	Y89    Other daily necessaries
Professional Classification:	GB    National Standard
ICS Classification:	11.040.70 11.040.70    Ophthalmic equipment 11.040.70
Source Content Issued by:	AQSIQ; SAC
Issued on:	2011-12-30
Implemented on:	2012-12-1
Status:	to be superseded
Superseded by:	GB/T 27995.1-2025 Semi-finished spectacle lens blanks―Part 1: Single-vision and multifocal
Superseded on:	2026-3-1
Abolished on:	2026-03-01
Target Language:	English
File Format:	PDF
Word Count:	3000 words
Translation Price(USD):	244.0
Delivery:	via email in 1 business day

1 Scope This part of GB 27995 specifies requirements for the optical and geometrical properties of single-vision and multifocal lens blanks. This part is applicable to single-vision and multifocal lens blanks. Note: The requirements for progressive power lens blanks are given in GB 27995.2. 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 4 5 Requirements 4 6 Test Methods 6 7 Identification 8 8 Reference to this Part 9