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Title:: Research on eye movement characteristics of different lens wearing comfort

Author(s):: HU Yibo ; WU Jie; XIANG Huazhong; FAN Biyue; School of Medical Instrument and Food Engineering, University of Shanghai for Scienceand Technology, Shanghai 200093, China

Keywords:: Eye movement characteristics; Degree of comfort; Pupil diameter; Fixation point; Saccade frequency

摘要:: 研究佩戴不同镜片的眼动特征，为镜片舒适度评估找到客观的参考依据。由20名受试者佩戴装有镜片的眼动仪，在视物距离4 m和30 cm的地方，完成指定的视物任务。实时获取每位受试者的眼动数据，并对数据进行统计学处理。受试者瞳孔直径在视远距离时相较视近距离平均增大18.3%，平均发生率为86.1%；当视物距离较远时，注视点的位置分布在视野的中上部，视物距离较近时，注视点的位置分布在视野的中下部，发生率为83.3%。受试者佩戴不适镜片时的瞳孔直径相较舒适时平均减少20.5%，发生率为88.9%（P<0.05）；佩戴不适镜片情况下，眼跳次数相较舒适时平均上升15%,发生率为75%（P<0.05）。在不同舒适度下，眼动特征变化存在一定客观规律，可以通过瞳孔直径、眼跳次数来衡量镜片的舒适情况，为镜片设计等提供参考。

Abstract:: To find objective references for evaluating the lens comfort by investigating the characteristics of eye movements with wearing different lenses,twenty subjects wore eye trackers with lenses to complete the specified vision tasks at the distance of 4 m and 30 cm respectively. Their eye movements were recorded in real time and the datawere processed statistically.During the experiment, pupil diameter(PD) increased by an average of 18.3% when they focused on objects at long distance range than that at short distance,the average probability was 86.1%.The probability was 83.3%when the visual fixation point was in the middle and upper part of the visual field at long distance,and was in the middle and lower part of the visual field at the short distance.Compared wearing uncomfortable lenses with wearing comfortable lenses,the PD decreased by 20.5%,the probability was 88.9%（P<0.05）, while the frequency of saccades increased by 15% ,the probability was 75% (P<0.05).It indicates that the comfort of the lenses can be measured by the pupil diameter and the frequency of saccade, and can provide objective references for lens design.