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A—V综合征为一种亚型的水平性斜视,因同时伴有垂直非共同性,所以患者在向上看与向下看时水平斜视角的大小有变化。A征是指眼往上看时集合加大;V征是指眼往下看时集合加大。A征又有内斜A征及外斜A征之分,内斜A征前眼往上看比往下看内斜度数大;外斜A征前眼往上看比往下看时的斜度数小。V征也有内斜V征及外斜V征之分,上下眼位的变化与A征相反。
A-V syndrome is a sub-type of horizontal strabismus, with vertical non-commonality, so the patient looks up and down when looking at the horizontal squint angle changes in size. A sign refers to the collection of eyes to see when the increase; V sign refers to the eyes look down when the collection increases. A sign there are a sign of oblique A and the sign of the external oblique A, oblique A levy before the anterior eye to see than the next look at the number of large inclinations; external oblique A levy anterior than looking down when looking at the slope of the number small. V levy also have V-levy and V-levy oblique point, the upper and lower eye position changes and A sign opposite.