BS EN ISO 8321-2 pdf free download
BS EN ISO 8321-2 pdf free download. Ophthalmic optics – Specifications for material, optical and dimensional properties ofcontact lenses – Part 2: Single-vision hydrogel contact lenses.
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-half of the tolerance limit specified for the property. The International Standards which specify the relevant test methods are listed in Tables 1 and 2. 4.2? Conditioning of contact lenses prior to testing Contact lenses shall be conditioned in accordance with the relevant test method. 4.3? Tolerances When tested as described in 4.1 and 4.2 the dimensional and optical properties shall be as specified, within the appropriate tolerance limits given in Table 1 and the material physical properties as given in Table 2. 5? Requirement for finish 5.1? Criteria Acceptance and failure criteria for inclusions, surface imperfections, edge contour and finish shall be documented by the manufacturer. 5.2? Inclusions and surface finish When examined at ?1 0 magnification in standard saline solution according to ISO 1 0344, the contact lens shall not exhibit any inclusions or surface imperfections which could interfere with its intended functional use. 5.3? Edge contour and finish When examined at ?7 magnification, the contact lens edge shall meet the quality characteristics indicated by the manufacturer with respect to shape, smoothness and polish.BS EN ISO 8321-2 pdf download.
