Kiyomi Sakamoto Shoichi Aoyama Shigeo Asahara Kuniko Yamashita Akira Okada Relationship between Viewing Distance and Visual Fatigue in Relation to Feeling of Involvement. 232-239 2008 APCHI http://dx.doi.org/10.1007/978-3-540-70585-7_26 conf/apchi/2008 db/conf/apchi/apchi2008.html#SakamotoAAYO08