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周期性内斜视是近年认识到的一种罕见病例。估计在3000—5000个斜视患者中只有一例。1973年的调查表明541个眼科工作者一年中仅发现了13个新病例。作者列表说明了周期性内斜视的一般特征:
Periodic esotropia is a rare case that has been recognized in recent years. It is estimated that only one in 3000-5000 strabismus patients. The 1973 survey showed that 541 ophthalmologists found only 13 new cases in a single year. The list of authors explains the general characteristics of periodic esotropia: