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People with color vision deficiency (CVD) face several difficulties in performing daily tasks because they often fall outside of the culturally, linguistically, and educationally modulated majority opinion. This study aims to develop a device that can seamlessly input/output information based on the user's handling actions and to verify the validity of the support for daily decision-making of people with CVD. In this study, the use case is set as selecting clothes in a shop; online behavior observation is then conducted to design an assistive method and a watch-type device that shows useful information, such as the adjusted color and/or text for people with CVD on a display at the wrist is developed. An online user interview is conducted using a first-person perspective and bird's-eye perspective video with three CVD participants to verify the validity of the developed device for daily support. Consequently, the accuracy and …