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An interactive optical see-through HMD (head-mounted device) which makes use of a user's gaze information for the interaction in the AR (augmented reality) environment. In particular, we propose a method to employ a user's half-blink information for more efficient interaction. As the interaction is achieved by using a user's eye gaze and half-blink information, the proposed system can provide more efficient computing environment. In addition, the proposed system can be quite helpful to those who have difficulties in using conventional interaction methods which use hands or feet. The experimental results present the robustness and efficiency of the proposed system.