Much psychological research uses pupil diameter measurements to investigate the cognitive and emotional effects of visual stimuli. A potential problem is that accommodating at a nearby point causes the pupil to constrict. This study examined to what extent accommodation is a confounder in pupillometry research. Participants solved multiplication problems at different distances (Experiment 1) and looked at line drawings with different monocular depth cues (Experiment 2) while their pupil diameter, refraction, and vergence angle were recorded using a photorefractor. Experiment 1 showed that the pupils dilated while performing the multiplications, for all presentation distances. Pupillary constriction due to accommodation was not strong enough to override pupil dilation due to cognitive load. Experiment 2 showed that monocular depth cues caused a small shift in refraction in the expected direction. We conclude that, for the young student sample we used, pupil diameter measurements are not substantially affected by accommodation.

许多心理学研究使用瞳孔直径测量来研究视觉刺激的认知和情感影响。潜在的问题是，容纳在附近的点会导致瞳孔收缩。这项研究检查了在何种程度上调节是瞳孔测量学研究的混杂因素。参与者解决了在不同距离处的乘法问题（实验1），并查看了具有不同单眼深度线索的线图（实验2），同时使用光折射仪记录了他们的瞳孔直径，折射和发散角。实验1表明，对于所有的演示距离，瞳孔在进行乘法运算时都会扩张。由于适应引起的瞳孔收缩不足以克服由于认知负荷而引起的瞳孔扩张。实验2表明，单眼深度提示会导致沿预期方向的折射发生小变化。我们得出的结论是，对于我们使用的年轻学生样本，瞳孔直径测量值基本上不受住宿条件的影响。