Abstract: 【Abstract】 Objective To evaluate the fusional function of the children with intermittent extropia. Design Retrospective case series. Participants Forty-eighty cases with intermittent extropia. Methods The binocular vision of 48 children with intermittent extropia was evaluated by synoptophore and the near stereopsis was examined with stereogram designed by YAN Shao-ming. The values measured from normal children were used as control. Main Outcome Measures Simultaneous perception, fusional amplitude and stereopsis. Results Eight out of the 48 patients had no simultaneous perception, and 34 had the point of simultaneous perception in the negative field of fusion. Eleven patients had no fusion function, and 37 patients had a negative fusional amplitude of 4.97°±2.11° and a positive fusional amplitude of 12.74°± 5.57°， which were significantly different from the normal control (3.52°±0.96° and 24.05°±6.67° respectively, all P＜0.05). Twenty-three of the patients had no distant stereopsis and only 2 had the near stereopsis disrupted. Conclusion In the children with intermittent extropia, the negative fusional amplitude is enlarged and the positive fusional amplitude is shrinked, and the distant stereopsis is damaged earlier than near stereopsis. （Ophthalmol CHN, 2012, 21: 398-400）

Key words: intermittent extropia, synoptophore, fusion, stereopsis