Session: Poster session C

A comparison of surgical outcomes between manifest exotropia and esotropia cases

Introduction:The improvement of ocular alignment and binocular sensory function is the goal of surgical correction in patients with strabismus.  The aim of this study was to compare the surgical outcomes of concomitant manifest esotropia (ET) and exotropia (XT) cases.

Methods:In present retrospective study, 30 XT and 74 ET patients who had undergone strabismus surgery were involved. Data on type and duration of strabismus, age at onset of deviation and surgery, pre- and postoperative strabismus deviation angles, and near and distance stereoacuity was recorded. Statistical analysis were used Wilcoxon signed ranks test, chi-square test.

Results:In esotropia group, 68 cases (92%) had successful near and distance ocular alignment(<10 prism diopters) after surgery. 58 cases had ability to cooperate with stereopsis examination. After surgery, 53 cases (91%) had near stereopsis (52%, good stereopsis), and  45 cases (78%) had distance stereopsis (31%,good stereopsis). In exotropia group, 26 cases (87%) had  successful near and distance ocular alignment (<10 prism diopters) after surgery. 23 cases had ability to cooperate with stereopsis examination. After surgery, 16 cases (78%) had near stereopsis (70%,good stereopsis), and  16 cases (78%) had distance stereopsis (70%,good stereopsis). Though XT patients showed better pre-operative near and distance stereopsis than ET patients, the near and distance stereopsis after surgery was significantly improved in patients with esotropia(p <0.001,p<0.001). On the contrary,  the near and distance stereopsis after surgery  was not significantly improved in patients with exotropia(p =0.368,p=0,154).

Conclusions:Surgical correction of strabismus could improve ocular alignment and binocular sensory functions in patients with manifest strabismus, regardless of onset age, strabismus duration, or type. Compared with XT patients, ET patients could recover more binocular sensory functions if postoperative successful ocular alignment is achieved,