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Sensory substitution can occur across sensory systems, such as touch-to-sight, or within a sensory system such as touch-to-touch. Sensory substitution studies have demonstrated the capacity of the brain to adapt to information relayed from an artificial receptor via an auditory or tactile HMI. With training and with motor control of the input by the subject, percepts are accurately identified and spatially located. (Paul & Stephen, 2003) Vision generally plays a dominant role in the sensory application of normal individuals. Due to the limited visual input of individuals with visual impairments, they rely on other sensory inputs to achieve cognitive compensation. They combine surrounding information with memory through non-visual means such as touch, hearing, and taste to form their perception of the external world. According to the principle of sensory compensation, if the functions of other sensory pathways are effectively utilized and a multimodal interaction design model is formed, it can compensate for functional deficiencies in actions. (Wei, Z. & Cong, A., 2009) When designing products for the visually impaired, it is essential to focus on stimulating other senses beyond vision to enhance product usability and ease of use. By enhancing the sensory experience of other senses, visually impaired individuals can better perceive products and improve their overall user experience. Therefore, the concept of sensory compensation holds significant importance in product design, as it helps designers better understand and apply the characteristics of human sensory functions, resulting in the creation of more universally applicable and user-friendly products that provide a better experience for users. When applying the theory of visual compensation to product design for visually impaired individuals, it can be summarized into the following three design factors: 1) Size. The size of the object determines the degree of visual stimulus elicited in the design, taking into account the size, shape, and proportions of the design. 2) Color. For the visually impaired group of color perception is relatively poor, but does not mean that it cannot be perceived, the design process in the product shape or operation of the prompt icon using strong contrasting colors will be easier for the visually impaired group to perceive. 3) Sound. Most of the visually impaired people have higher hearing sensitivity than ordinary people, so the design of compensated products should consider sound as an aspect of assisted identification. 5.2.2 Case Study on Product Design for the Visually Impaired By organizing and categorizing the existing product designs and marketed goods for the blind, relevant cases about the feedback mechanism of visual compensation products for the visually impaired are listed from them. After analyzing, the contents were classified into five types: 1) Shape feedback, 2) Color feedback, 3) Auditory feedback, 4) Tactile feedback, 5) Physical structure - 105 -