Existing eye tracking software have certain limitations, especially with respect to monitoring reading online: (1) Most eye tracking software record eye tracking data as raw coordinates and stimuli as screen images/videos, but without inherent links between both. Analysts must draw areas of interest (AOIs) on webpage text for more fine-grained reading analysis. (2) The computation and analysis of fixation and reading metrics are done after the experiment and thus cannot be used for live applications. We present EyeLiveMetrics, a browser plugin that automatically maps raw gaze coordinates to text in real time. The plugin instantly calculates, stores, and provides fixation, saccade, and reading measures on words and paragraphs so that gaze behavior can be analyzed immediately. We also discuss the results of a comparative evaluation. EyeLiveMetrics offers a flexible way to measure reading on the web - for research experiments and live applications.

翻译：现有眼动追踪软件存在一定局限性，尤其在在线阅读监测方面：（1）多数眼动追踪软件将眼动数据记录为原始坐标，刺激材料记录为屏幕图像/视频，但两者之间缺乏固有联系。分析人员必须在网页文本上手动绘制兴趣区（AOIs）才能进行细粒度阅读分析。（2）注视点与阅读指标的计算分析均在实验结束后进行，无法应用于实时场景。本文提出EyeLiveMetrics——一款能够将原始注视坐标实时映射至文本的浏览器插件。该插件可即时计算、存储并提供词汇与段落层级的注视、扫视及阅读指标，从而实现眼动行为的即时分析。文中同时讨论了对比评估的实验结果。EyeLiveMetrics为网络阅读测量提供了灵活解决方案，既适用于研究实验，也可应用于实时场景。