DS DS/EN ISO 11539
DS DSEN SO 11539 1999-NOV-22 Ophthalmc optcs - Contact lenses - Classfcaton of contact lenses and contact lens materals Replaced by DS DSEN SO 18369-1A1
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This International Standard describes a method for classifying contact lenses and the materials used for their manufacture. It permits the specific and non-proprietary identification, in simplied form, of the major chemical components of the material.