| 摘要 |
A progressive-power lens can be properly evaluated based on optical performance values of which definition methods are not unified, such as progressive zone length and addition diopter. In addition to commodity product specifying information 11 a which specifies a trade name of a lens 9 , progressive zone length specifying information 11 b which specifies length of a progressive zone of the lens, material refractive index specifying information 11 c which specifies a material refractive index of the lens, and addition diopter specifying information 11 d which specifies addition diopter of the lens, definition method specifying information 11 e is inscribed on the progressive-power lens 9 . The definition methods of the aforesaid progressive zone length and the addition diopter are specified by the definition method specifying information 11 e.
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