Admitting the dichotomy of perception,the author of this paper holds that the only subject of internal perception is the brains which is conscious of the fuction of its body,and physical occurrences are the objects of external consciousness.

The cognition embodied in language consists in the opposition and reciprocity of inner structure and outer perception,that is,the discreteness,hierarchicality,and recursiveness of logic(the law of our thought) vs.

·METHODS: The retrospective analysis included 48 cases of large-angle exotropia who were performed supernor-mal lateral rectus muscle recession, from January 2006 to July 2008 in our hospital, which including 29 divergence excess pattern, 16 sensory exotropia, and 3 paralytic exotropia.