The approach of the accessibility is necessary for all the people to be able to use the Internet. As the visual elements are very important factors in the Internet, in our previous study, the visibilities of young adults, the elderly and dichromatic vision persons were evaluated using the simulation filters. In this report, we estimated visibility prediction formula from RGB values by the multiple regression analysis. In the analysis an objective variable was assumed to be visibility scores, and explanatory variables were assumed to be a color brightness difference and color difference with the formula defined by W3C/WAI. The visibility of 215 web-safe colors was determined using the formula of W3C/WAI. As the result, the available visibility prediction formula was obtained in all groups.

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Congenital insensitivity to pain (CIP), which is an extremely rare sensory neuropathy, is defined as the absence of normal responses to noxious stimuli. We previously demonstrated a deficit of motor capacity in CIP patients which can be at least partly attributed to a lack of sensory inputs mediated by pain-related afferent input. We here developed an education tool for pain sensation and sympathy regarding unpleasant sensation for patients with congenital insensitivity to pain.

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