沿简单路线行走时的注视方向：视力正常者和色素性视网膜炎患者。
Direction of gaze while walking a simple route: persons with normal vision and persons with retinitis pigmentosa.
作者信息
Turano K A, Geruschat D R, Baker F H, Stahl J W, Shapiro M D
机构信息
The Johns Hopkins University School of Medicine, Wilmer Eye Institute, Baltimore, Maryland, USA.
出版信息
Optom Vis Sci. 2001 Sep;78(9):667-75. doi: 10.1097/00006324-200109000-00012.
PURPOSE
The purpose of this study was to determine whether persons with advanced vision impairment, when walking an unfamiliar route, visually sample the environment in a different manner than do persons with normal vision.
METHODS
Direction of gaze was measured in six persons with retinitis pigmentosa (RP) and in three persons with normal vision as they walked an unfamiliar, obstacle-free route while viewing the environment in a head-mounted display.
RESULTS
Persons with RP fixated over a larger area in the environment and at different features than did persons with normal vision. Persons with normal vision directed their gaze primarily ahead or at the goal, whereas persons with RP directed their gaze at objects on the walls, downward, or at the layout (i.e., edge-lines or boundaries between walls). The results also showed a significant negative correlation between the horizontal visual field extent of the RP subjects and the proportion of downward-directed fixations.
CONCLUSIONS
Persons with advanced vision impairment as a result of RP visually sample the environment in a manner different from persons with normal vision.
目的
本研究的目的是确定患有严重视力障碍的人在走一条不熟悉的路线时，是否会以与视力正常的人不同的方式对环境进行视觉采样。
方法
在六名患有视网膜色素变性（RP）的人和三名视力正常的人行走一条不熟悉的、无障碍物的路线时，通过头戴式显示器观察环境，测量他们的注视方向。
结果
与视力正常的人相比，患有RP的人在环境中注视的区域更大，注视的特征也不同。视力正常的人主要将目光向前或朝着目标方向，而患有RP的人则将目光投向墙壁上的物体、向下或布局（即墙壁之间的边线或边界）。结果还显示，RP受试者的水平视野范围与向下注视的比例之间存在显著负相关。
结论
因RP导致严重视力障碍的人对环境进行视觉采样的方式与视力正常的人不同。
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