透镜毛坯 meaning in English

lens blank

Ophthalmic optics - semi - finished spectacle lens blanks - specifications for single - vision and multifocal lens blanks
眼科光学.半成品透镜坯.单光透镜毛坯和多焦透镜坯规范
Ophthalmic optics - semi - finished spectacle lens blanks - part 1 : specifications for single - vision and multifocal lens blanks
眼科光学.半成品眼镜坯.第1部分:单光透镜毛坯和多焦透镜坯规范