GB/T 11417.5 - 2012 Focus on Optical inspection of contact lenses Optical Property testing. This standard specifies the selection principles and preparation process of contact lens samples to ensure that they can represent the true characteristics of the product. Detail the instruments and equipment required for testing Optical Property, such as focimeter, etc., and clarify its accuracy requirements. For Optical inspection indicators such as diopter and prism of contact lenses, specific measurement procedures and operation points are standardized. According to this standard, the Optical Properties of contact lenses can be accurately determined, providing a basis for product mass control, wearing comfort and visual effect protection, helping the ophthalmic Optical inspection industry to improve product mass and meet consumers' Optical Property needs for contact lenses.