Bilateral Duane's syndrome.

Two cases with bilateral Duane's Syndrome are presented. Both showed immediate large angle exotropia following bilateral medial rectus recession for esotropia. In both cases, the forced duction test was then found to be positive in adduction and negative after disinsertion of the lateral rectus. It is suggested that both the medial rectus muscles and lateral rectus muscles are tight in bilateral Duane's Syndrome and that seemingly simultaneous recession of the medial and lateral rectus muscles would be indicated.