BS EN ISO 8321-2-2000 Ophthalmic optics . 一 Specifications for material, optical and dimensional properties of contact ] lenses – Part 2: Single-vision hydrogel contact lenses

BS EN ISO 8321-2-2000 Ophthalmic optics . 一 Specifications for material, optical and dimensional properties of contact ] lenses – Part 2: Single-vision hydrogel contact lenses. This part of ISO 8321 specifies requirements for hydrated single-vision hydrogel contact lenses including tolerance limits for material, optical and dimensional properties. A method for presenting the specification of contact lenses is described in annex A. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 8321. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 8321 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 8320-1 :__1), Contact lenses and contact lens care products — Vocabulary — Part 1: Contact lenses. ISO 8599:1994, Optics and optical instruments — Contact lenses — Determination of the spectral and luminous transmittance. ISO 9337-1:1999, Contact lenses — Determination of back vertex power — Part 1: Method using focimeter with manual focusing. ISO 9338:1996, Optics and optical instruments — Contact lenses — Determination of the diametes’s. ISO 9339-2:1998, Optics and optical instruments — Contact lenses — Determination of thickness — Part 2: Hydrogel contact lenses. ISO 991 3-1 :1996, Optics and optical instruments — Contact lenses — Part 1: Determination of oxygen permeability and transmissibility with the FA 7T method, ISO 9914:1995, Optics and optical instruments — Contact lenses — Determination of refractive index of contact lens materials. ISO 10338:1996. Optics and optical instruments — Contact lenses — Determination of curvature. ISO 10339:1997, Ophthalmic optics — Contact lenses — Determination of water content of hydrogel lenses. ISO 10344:1996. Optics and optical instruments — Contact lenses — Saline solution for contact lens testing. 3 Terms and definitions For the purposes of this part of ISO 8321, the terms and definitions given in ISO 8320-1 apply. 4 Requirements for dimensions and optical properties 4.1 Test methods Each dimension and physical or optical property specified shall be determined using a test method with a measurement tolerance limit better than one-hall of the tolerance limit specified tor the property. The International Standards which specify the relevant test methods...