Todo-za was to advance visually impaired people and to secure their regular vocation, but also served as an educational institution for regular vocation to pass on skills from a master to an apprentice, and honjo (lord of the guild) was the Koga family of the Murakami-Genji (Minamoto Clan).
当道座は、盲人の地位向上や生業の安定をはかるものであったが、生業に関して師匠から弟子へ技能を継承する教育機関としての役割も担い、本所は村上源氏に属する久我家であった。