EN ISO 8321-1:1996 Optics and Optical Instruments - Contact Lenses - Part 1: Specification for Rigid Corneal and Scleral Contact Lenses ISO 8321-1: 1991
2002EN ISO 8321-1:2002 Ophthalmic optics - Specifications for material, optical and dimensional properties of contact lenses - Part 1: Rigid corneal and scleral contact lenses ISO 8321-1:2002; Partially superseded by CEN EN ISO 18369-1 and CEN EN ISO 18369-2: 2006 [: CEN EN IS
1996EN ISO 8321-1:1996 Optics and Optical Instruments - Contact Lenses - Part 1: Specification for Rigid Corneal and Scleral Contact Lenses ISO 8321-1: 1991