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- W2000508041 abstract "Measurement of oxygen permeability of contact lens materials, both hydrogel and rigid gas permeable (RGP), by the polarographic method has been accepted as a standard method by the International Standards Organization (ISO) in their ISO Draft Standard No. 9913. In this standard, ISO recommends application of a mathematical correction to take into account an effect that is called the “edge effect.” We describe here a modification of the conventional polarographic sensor to include a guard ring surrounding the cathode. The guard ring reduces the polarographic current that is responsible for the edge effect to a negligible amount. Oxygen permeabilities obtained directly from sensor data when the guard ring is in operation are shown to be in excellent agreement with permeabilities obtained without the guard ring but subsequently corrected for the edge effect by the method described in ISOIDIS Standard No. 9913." @default.
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- W2000508041 date "1994-05-01" @default.
- W2000508041 modified "2023-10-14" @default.
- W2000508041 title "Application of guard ring technology to the measurement of oxygen permeability of contact lens materials by the polarographic method" @default.
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- W2000508041 doi "https://doi.org/10.1016/0892-8967(94)90005-1" @default.
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