4.诊断与鉴别诊断:典型的周期性斜视具有特异的临床表现,诊断并不困难,对已转变为恒定性内斜视者应详细询问病史,对于变异者应观查数日方可诊断。应与下列疾病进行鉴别;1.间歇性斜视:本病无时间上的周期规律,在疲劳,调节及融合遭到破坏时,可以由隐斜变成显斜。2.周期性动眼神经麻痹:动眼神经麻痹与痉挛呈周期性交替出现,其周期极短。一般为数秒或数分钟,眼位向外 4. Diagnosis and differential diagnosis: Typical periodic strabismus with specific clinical manifestations, the diagnosis is not difficult, have been transformed into a constant esotropia should be asked in detail about the history of the mutation should be observed for a few days before diagnosis. Should be identified with the following diseases: 1. Intermittent Strabismus: The disease is not the time period of the law of fatigue, conditioning and fusion is destroyed, can be changed from hidden oblique Obviously oblique. 2. Periodic oculomotor nerve paralysis: oculomotor nerve paralysis and spasm showed cyclical alternating, the cycle is extremely short. Generally a few seconds or minutes, eye position outward