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Objective
The purpose of this study is to evaluate reading time and characteristics of fixations at different distances when looking through different areas of progressive power lenses (PPL) with different power distributions by means of eye-tracking technology.
Method
A wearable eye tracker system (Tobii-Pro Glasses 3) was used to record the pupil position of 28 PPL subjects when reading at near and distance vision while using 3 different PPL designs: a PPL optimized for distance vision (PPL-Distance), a PPL optimized for near vision (PPL-Near) and one of them balanced for a general use (PPL-Balance). Subjects were asked to read out loud a text displayed on a digital screen located at 5.25m and 0.37m when they were looking through the central and peripheral regions of each PPL. Reading time, total duration of fixations, and the number of fixations were analyzed for each reading condition and PPL. Statistical analysis was carried out using Statgraphics Centurion XVII.II Software.
Results
The analysis of eye movements at distance-reading vision showed a statistically significant lower reading time (p = 0.004) and lower total duration of fixations (p = 0.01) for PPL-Distance. At near-reading vision, PPL-Near provided statistically significant lower reading time (p<0.001), lower total duration of fixations (p = 0.02), and less fixation count(p<0.001) in comparison with PPL-Balance and PPL-Distance.
Conclusions
Reading time and fixations characteristics are affected by the power distribution of a PPL. A PPL design with a wider distance region provides better distance-reading performance while a PPL with a wider near area performs better at a near-reading task. The power distribution of PPLs influences the user performance at vision-based tasks. Thus, to provide the user with the best visual experience, PPL selection must consider user needs.

### 研究目标
本研究旨在通过眼动追踪技术，评估通过不同屈光分布的渐进多焦点镜片（Progressive Power Lenses，PPL）的不同区域视物时，不同视距下的阅读时长与注视特征。

### 研究方法
本研究采用可穿戴式眼动追踪系统（Tobii-Pro Glasses 3），记录28名受试者佩戴三款不同设计的PPL时，近距与远距阅读状态下的瞳孔位置：三款PPL分别为远距优化型PPL（PPL-Distance）、近距优化型PPL（PPL-Near）以及通用平衡型PPL（PPL-Balance）。要求受试者分别通过每款PPL的中央与周边区域，朗读显示于5.25米与0.37米处数字屏幕上的文本。针对每种阅读场景与PPL组合，分析阅读时长、总注视时长与注视点数量。统计分析采用Statgraphics Centurion XVII.II软件完成。

### 研究结果
远距阅读场景下的眼动分析结果显示，远距优化型PPL的阅读时长（p=0.004）与总注视时长（p=0.01）均存在统计学意义上的显著降低。近距阅读场景下，与平衡型PPL及远距优化型PPL相比，近距优化型PPL的阅读时长（p<0.001）、总注视时长（p=0.02）与注视点数量（p<0.001）均存在统计学意义上的显著降低。

### 研究结论
阅读时长与注视特征会受到PPL屈光分布的影响。具备更宽远距区域的PPL设计可获得更优的远距阅读表现，而具备更宽近距区域的PPL则在近距阅读任务中表现更佳。PPL的屈光分布会影响用户在视觉相关任务中的表现。因此，为向用户提供最佳视觉体验，选择PPL时需充分考虑用户的实际需求。