1·To observe 30 cases with low degree intermittence exotropia in children for 30 months without any treatment, and analyze the exotropia degree change and the stereoscopic vision change.
观察30例低度数儿童间歇性外斜视的平均30个月自然经过，不用任何治疗。分析斜视度的变化及立体视觉的变化。
2·To discussion the opportunity choice on the intermittence exotropia surgery.
探讨间歇性外斜视的手术时机。
3·In contrast with point source pollution, non-point pollution is difficult to control and prevent because of its randomicity, intermittence, hysteresis and complexity.
与点源污染相比，非点源污染具有随机性、间歇性、滞后性、复杂性等特点，不易控制和治理。
4·CONCLUSION: Children with comitant exotropia may achieve higher orthophoric rate with surgical alignment before the lost of fusion and intermittence.
结论：儿童共同性外斜视在斜视仍为间歇性、融合功能未丢失之前手术疗效较好。
5·To observe and analyse the relationship between the operating time and the low degree intermittence exotropia in children.
观察和分析低度数儿童间歇性外斜视与其手术时机的选择。