提出了一种通过测量瞳孔直径来判断自由立体显示器观看视疲劳程度的方法，并且建立了一种瞳孔直径的测量装置.该装置可在连续播放立体视频时记录观看者的瞳孔直径.通过观看者的主观评价得出视疲劳程度随着观看时间的增加而加剧，同时实验表明观看者瞳孔直径也随着观看时间的增加而变大，由此可得出将瞳孔直径作为一种新的视疲劳度量指标.当观看者的视疲劳处于中等水平时，观看者的瞳孔直径变化量为0.4 mm，可将该值确定为观看舒适度的临界值.

A method was proposed to evaluate visual fatigue in autostereoscopic displays by measuring the pupil diameter of viewers.And a pupil diameter measuring device was presented to record the viewers′ pupil diameter when the viewers watch threedimensional videos.The conclusion was made that the degree of visual fatigue increases as the increase of viewing time according to viewers′ subjective evaluation,and experiments shown that the pupil diameter increases as the increase of the degree of visual fatigue.As a result,the pupil diameter can be used as a new measurement index of visual fatigue.The variation of viewers′ pupil diameter is 0.4 mm when viewers′ visual fatigue is medium which can be considered as a critical value of viewing comfort.