 Here's a Dwayne's type 2. This is characterized by a limitation or absence of a deduction of the eye with a fairly normal to normal AB ducting movement. There you can see there's a little problem there with a deduction of that left eye, but the AB ducting movement is fairly normal. For the most part, Dwayne's syndrome is a congenital disorder. There are not very many pathologic examples of Dwayne's syndromes. Few that have been reported suggest that the problem lies within the brainstem with a genesis of the abducens nucleus and nerve with the lateral rectal muscles receiving partial anomalous innervation from the third nerve, nucleus, and nerve. I would refer you to Walsh and Hoyt's new edition for a summary of the pathologic reports.