Monocular circumduction nystagmus is a very rare ocular movement. A type of circumduction movement, it is caused by successive movements of all the ocular muscles within the framework of a pendular nystagmus. As a monocular movement, it raises the question of the physiopathological mechanism of such a movement which is so complex and is also limited to one eye. The existence of a monocular form of circumduction nystagmus makes it necessary to revise the mechanism of pendular nystagmus.