An attempt to measure responses of near triad, i.e., convergence eye movement, binocular accommodation and pupillary near reflex, was performed. Dynamic measurement with time resolution of 1/30s could be carried out from distant place of 1.2 meter. A video refraction technique was applied for the measurement of accommodation. Commercially available video refraction unit was employed. Obtained image from the unit was once recorded to video tapes and was analysed by a computer using freely distributed image analysis program. Examples of measurement are shown when subjects seeing 3D display of image splitter method. Though many problems to be solved such as difficulty in calibration remain, this method will be useful for study of near triad because both apparatus and subject can be arranged relatively freely.
