Objective:To determine the efficacy of bilateral lateral rectus recession combined with inferior oblique tenotomy in the treatment of convergence insufficiency type exotropia with inferior oblique overaction. Methods:In this retrospective study

all 44 patients with convergence insufficiency type exotropia and inferior oblique overaction underwent bilateral lateral rectus recession and in-ferior oblique muscle tenotomy and then followed at least 6 months from January 2013 to June 2014. Before operation

examinations on visual acuity

fixation

refractive state

extropia angle on 33 cm and 6 m

dynamic stereoscopic vision

simultaneous perception

fusion and stereopsiswere performed. Follow-up examinations on ocular alignment

stereopsis

strabismus degree were also performed.Results:The success rates of postoperative 1 to 3 days and 6 months was respectively 88.6% and 77.2%. Exotropia degree decreased significantly in both near and far distance in postoperative group than in preoperative group(P<0.05). Additionally

after postoperative 6 months

dynamic stereoscopic vision

simultaneous perception

fusion and stereopsis were significantly improved when compared with those of preoperation group(P<0.05). However

the stereoscopic vision recovery rate in<12 years group was significantly higher when compared with that of ≥12 years group(P<0.05). Conclusion:The combination of bilateral lateral rectus recession and inferior oblique tenotomy is a safe and effective procedure in the treatment of convergence insufficiency type exotropia. Fusion and senior stereoscopic vision can be improved obviously after surgery. In addition

the earlier operative age

the better recovery can achieved.