Historical
ISO 9913-2:2000
Optics and optical instruments - Contact lenses - Part 2: Determination of oxygen permeability and transmissibility by the coulometric method
This part of ISO 9913 describes a coulometric method for the determination of oxygen permeability of both rigid and non-hydrogel flexible contact lens materials and oxygen transmissibility of rigid and non-hydrogel flexible contact lenses. It specifies the procedures for the measurements and establishes the conditions under which measurements are made.
This part of ISO 9913 is applicable to the determination of oxygen transmissibility of rigid and non-hydrogel flexible contact lenses, incorporating various refractive powers and radially symmetric contact lens geometries, and the oxygen permeability (Dk) of rigid and non-hydrogel flexible contact lens materials in the form of standardized test samples.
This part of ISO 9913 is especially useful for the determination of permeability values above 75 × 10−11(cm2/s) [ml O2/(ml·hPa)], which fall above the usual range of the standard polarographic method of measurement (FATT method, see ISO 9913-1).
This part of ISO 9913 is not applicable to hydrogel materials or hydrogel contact lenses.
Content Provider
International Organization for Standardization [iso]
