AIM: To evaluate the efficacy of anterior transposition of the inferior oblique muscle(IO)for treatment of eyes with asymmetric double dissociated vertical deviation(DVD).

METHODS: Totally 15 patients with asymmetric DVD which coexisted with unequal IO overaction(IOOA)(+～+++)were enrolled, the eye of strabismus degree >15^△-20^△ underwent anterior transposition of the part muscles inferior oblique muscles, and the eye of strabismus degree>20^△ underwent anterior transposition of the all muscles inferior oblique muscles, the correct intensity of eye position and muscle function after surgery and the size of palpebral fissure were evaluated.

RESULTS: The IOOA disappeared in all of 15 eyes, and according to the data of the postoperative effect which was good in 13 cases and there still was residued degree vertical slope in 2 cases, in other respects, a little limited of eye ball up rotation and coarctation of palpebral fissure were observed.

CONCLUSION: The slope degree of DVD is often asymmetric, and it could treat with all inferior oblique translocation or translocation respectively, according to the first bit vertical gradient size, in order to reduce coarctation of palpebral fissure or on limited of eye ball up rotation.