Geruschat D R, Turano K A, Stahl J W
The Maryland School for the Blind, Baltimore 21236, USA.
Optom Vis Sci. 1998 Jul;75(7):525-37. doi: 10.1097/00006324-199807000-00022.
This study evaluated the effects of retinitis pigmentosa (RP) on mobility performance (walking speed, mobility incidents) under conditions of normal and reduced illumination and on self-perceived mobility difficulties. The results showed that RP subjects travel more slowly than the normally sighted subjects, that both normally sighted and RP subjects travel more slowly under reduced illumination, and that RP subjects are five times more likely to have a mobility incident under reduced illumination than the normally sighted subjects. Walking speed was significantly correlated with the visual characteristics: log minimum angle of resolution (log MAR), log peak contrast sensitivity (log CS), and visual field extent. Nearly 70% of the variance in the RP subjects' walking speed was accounted for by log CS and visual field extent. Responses on a mobility questionnaire showed that 80% of the RP subjects experienced mobility difficulty. Furthermore, self-reported, mobility-related behaviors were statistically related to walking speed.
本研究评估了视网膜色素变性（RP）在正常光照和光照减弱条件下对移动能力（步行速度、移动事件）以及自我感知的移动困难的影响。结果表明，RP受试者比视力正常的受试者行走速度更慢，视力正常的受试者和RP受试者在光照减弱时行走速度均更慢，并且RP受试者在光照减弱时发生移动事件的可能性是视力正常受试者的五倍。步行速度与视觉特征显著相关：对数最小分辨角（log MAR）、对数峰值对比敏感度（log CS）和视野范围。RP受试者步行速度近70%的变异可由log CS和视野范围解释。移动能力问卷的回答显示，80%的RP受试者有移动困难。此外，自我报告的与移动相关的行为与步行速度在统计学上相关。
