抄録
The gas permeability（Dk）is one of the important characteristics of contact lens （CL） materials for the safety CL wearing. ISO standards of the Dk measurement method are published in 1996 and 2000. In ISO standards, reference materials are requested to get the calibration curve of Dk. According to ISO standards we are able to get the good reproducibility of Dk measurement and compare Dk with other CL.
