The Night Vision Aid (NVA) was evaluated to determine its effectiveness as an orientation and mobility (O&M) aid for legally blind people with night blindness. Twenty-four subjects walked a prescribed route during the day and at night without the NVA, and also at night with the NVA. They also walked a different route using the Wide Angle Mobility Light (WAML) to provide additional information on a second night mobility aid. Measures of performance are described. On the average, the NVA did not significantly improve the subjects’ mobility at night; the majority of them preferred the WAML.
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