Classification<unk> 's syndrome has three variants: *Type I: Limited abduction with or without esotropia *Type II: Limited adduction with or without exotropia *Type III: Limitation of both abduction and adduction and any form of horizontal strabismus Brown(1950) has classified<unk> 's syndrome according to the characteristics of the limitation of movement- * Type A: with limited abduction and less-marked limitation of adduction * Type B: showing limited abduction but normal adduction * Type C: the limitation of adduction exceeds the limitation of abduction. There is an exotropic deviation and a head turn to compensate the loss of adduction The first type is more common and accounts for 85% of the cases. Differential diagnosis In the clinical setting, the principal difficulties in differential diagnosis arise as a consequence of the very early age at which patients with this condition first present. The clinician must be persistent in examining abduction and adduction, and in looking for any associated palpebral fissure changes or head postures, when attempting to determine whether what often presents as a common childhood squint (note-"squint" is a British term for two eyes not looking in the same direction) is in fact<unk> . Fissure changes, and the other associated characteristics of<unk> 's such as up or down shoots and globe retraction, are also vital when deciding whether any abduction limitation is the result of<unk> 's and not a consequence of VI or abducens cranial nerve palsy. Acquired<unk> 's syndrome is a rare event occurring after peripheral nerve palsy.
Duane syndrome
Larsen syndrome
Crandall syndrome
Burnside–Butler syndrome
Adams–Nance syndrome
Stimmler syndrome
Havana syndrome
Jeavons syndrome