一种新型眼动仪准确性的初步研究

开发了一种新型眼动仪,用于估计物体与眼球的距离,并研究该装置的可靠性和准确性。23名被试者参与实验,每一个视觉任务分近(35 cm)、中(70 cm)、远(400 cm)距离进行测试,计算出反光中心和瞳孔中心之间的距离,并通过数据校准以估算实际距离。不同校准距离的中位数准确性为92%。标准距离为70 cm时,70 cm校准距离所得准确性明显高于使用其他两个校准距离(P<0.05),而标准距离为35 cm和400 cm时,不同校准距离所得准确性差异不显著(P>0.05)。所有估算距离结果与标准距离之间并没有实际意义的差异。基于准确性和估算距离的结果,初步判断新装置具有良好的可靠性和准确性。使用该眼动仪时,建议把70 cm作为校准距离。

Preliminary Study on the Accuracy of a New Eye Tracker

A new eye tracker was developed to estimate the distance between the object and the eye.A total of 23 subjects participated in the experiment.Each visual task was tested from near(35 cm),medium(70 cm)and far(400 cm)distances.The distance between the reflective center and the center of the pupil was calculated,and the actual distance was estimated through data calibration.The median accuracy of different calibration distances was 92%.When the standard distance was 70 cm,the accuracy of 70 cm calibration distance was significantly higher than that of the other two calibration distances(P<0.05).While when the standard distance was 35 cm and 400 cm,the accuracy of different calibration distances had no significant difference(P>0.05).There was no practical difference between the estimated distance results and the standard distance.Based on the results of accuracy and distance estimation,the new device has good reliability and accuracy.When using the eye tracker,70 cm is recommended as the calibration distance.