The loss of fusion in adults with intractable XXXX (central fusion disruption).

@entity1 @entity227 @entity231 @entity4118 @entity542 @entity1155 @entity892
@entity1 over the age of 10 years can lose their fusion ability. This acquired disruption of fusion gives rise to intractable @entity892 without @entity1155 . An involuntary vertical bobbing movement of the non-fixing eye, present only with both eyes open, occurs at or near the angle of superimposition. This appears to be a unique and characteristic sign of acquired disruption of fusion and was present in all cases. Other causes of @entity892 are mentioned and differentiated. Acquired central fusion disruption usually results from serious @entity542 . Partial recovery may occur but is unlikely. Sensory deprivation of at least 3 1/2 years' duration due to @entity227 in one eye resulting from a traumatic @entity231 and sometimes subsequent uncorrected unilateral @entity4118 caused loss of fusion in 15 @entity1 . The practical implications with regard to intraocular lenses and unilateral @entity4118 is discussed. Less commonly, vascular, neoplastic and presumed inflammatory lesions in the mid-brain area cause central fusion disruption.
