2017BS EN ISO 18369-4:2017 Ophthalmic optics. Contact lenses. Physicochemical properties of contact lens materials
2006BS EN ISO 18369-4:2006 Ophthalmic optics - Contact lenses - Physicochemical properties of contact lens materials
1970BS EN ISO 9913-2:2000 Optics and optical instruments - Contact lenses - Part 2: Determination of oxygen permeability and transmissibility by the coulometric method