In order to choose a proper type of window screen for windows under different conditions, it is required to predict visual discomfort caused by the screen. The purpose of this study is to propose a method for determining optimum optical properties of window screens to provide acceptable visual environment. The effects on the screen luminance of the openness factor of the fabric, the transmittance of the yarn and outside condition are examined. A computer simulation is conducted by using the Expanded AMeDAS weather data and the results shows luminance distribution on the screens and annual glare possibility.
