高齢視覚障害者の触知案内図におけるドットパターンの識別特性に点間隔が及ぼす影響

抄録

Raised dot patterns are commonly used to display drawings on tactile guide maps. However, there is a lack of quantitative data regarding the discrimination of raised dot patterns by older visually impaired persons. In this study, we investigated the influence of dot distances on discrimination of raised dot patterns in tactile guide maps by older visually impaired persons. We made test pieces with nine different dot distances for dot patterns, and conducted experiments to identify easily discriminable dot pattern combinations by comparing pairs of dot patterns. Participants included 10 older sighted persons as tactile guide map beginner users and 10 older visually impaired persons as expert users. The results showed that dot patterns with more than 5 mm differences in dot distances were easily discriminable for older visually impaired persons. In detail, these were 5 mm for older beginner users, 4 mm for older expert users.