本稿では、中途失明者の単独歩行時の動作と周辺環境を詳細に分析することで、中途失明者が直面する様々な問題を、環境ごとに明らかにした。結果として、傾向として中途失明者は道路の端部を伝い歩きしたい一方で、車道・歩道ともに障害物が多く接触してしまうため、端部を伝って歩くことができない現状が明らかになった。車道における具体的な歩行を阻害する要素としては、排水設備等、柱、段差解消ブロック、自転車等などである。%In this research, we tried to clarify which kind of objects or situations are preventing adventitiously blinded people from smooth walking in daily walking environment. Ten adventitiously blinded people are asked to walk independently in environments which they are fully accustomed to and have little difficulty to walk. Their walking behavior are recorded by video camera and analyzed. The results are as follows: 1) Adventitiously blinded people tend to walk on ether side of street, where there are objects such as power poles and bicycles which could be serious obstacles. 2) When walking on sidewalks, sometimes adventitiously blinded people happen to wander into parking lots or open spaces. 3) Tactical tiles, which are basically guiding adventitiously blinded people' s walking, are sometimes very difficult to follow, because surrounding ground's surface is very similar to tactical tiles.
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