Abstract: To study the correlation between the operative quantum and the preoperative far stereopsis for intermittent exotropia. Method： Fortyseven cases of intermittent exotropia received conventional operative quantum. Whether they had far and near stereopsis before operation and their postoperative eye positions were reviewed. Results: There were no significances of the postoperative orthotropia between the groups of having no stereopsis and only having near stereopsis (P＞0.05), but there was a significance between the groups of having far stereopsis and having no stereopsis or only near stereopsis(P＜0.01). Twentysix cases of far stereopsis were dealt with reduced operative quantum, and their postoperative orthotropia had no differences from those had no stereopsis or only had near stereopsis dealt with conventional operative quantum(P＞0.05). Conclusion： Modulating the operative quantum may improve the success rate of operation for intermittent exotropia on the base of having far stereopsis or not.

Key words: Stereoscopic vision , Exotropia