Ophthalmology
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To analyze whether the presence of the abducens nerve might depend upon the type of Duane's retraction syndrome (DRS). ⋯ The abducens nerve on the affected side was absent in type 1 DRS patients and some type 3 DRS patients, but present in type 2 DRS patients as well as in some type 3 DRS patients. In terms of the presence or absence of the abducens nerve, type 1 and type 2 DRS were homogenous, and type 3 DRS was heterogenous.