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However, with headwear eye trackers, patients are easy to feel tired during human\u2013machine interactivities (HMIs), and the operation accuracy is not satisfied compared with its counterparts. To address these two issues, herein, a visual feedback technique is developed which allows users to recognize machine's vision by positioning a laser spot to the user watched object, according to the location information interpreted from user's eye movement. Through the visual feedback technique, users not only obtain real\u2010time feedback, but also can fine\u2010tune the laser spot to the desired location before performing further operations. 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