由於少子化及醫療科技進步，全球漸漸邁入高齡化社會。銀髮族因老化造成視覺及認知反應退化，影響其使用產品的效率。台灣地區地狹人綢，機車已成為最普遍及具彈性的交通工具，但是在如此擁擠的環境中，機車肇事意外也層出不窮。而國內機車事故的高齡者比率根據交通部統計佔了四成之多，大部份是機車騎士未注意週遭車況，造成後方來車追撞或是在變換車道時發生擦撞。機車在行駛時，除了前方視野，後方交通資訊也相當重要，行車時後視鏡扮演一個相當重要的角色。有鑑於此，本研究希望透過人因實驗來探討銀髮族對於機車後視鏡的人因偏好及視閱性，找出適合銀髮族之機車後視鏡設計因素，提供未來適合銀髮族之機車後視鏡設計規範。提高銀髮族騎士在騎行機車的安全及視閱舒適性，減少交通意外的發生。本研究分為三階段人因實驗，第一階段探討不同後視鏡形狀對駕駛者視閱偏好之差異，發現銀髮族機車駕駛者對於四邊形後視鏡的視閱偏好度最高。第二階段探討後視鏡大小對視認性的影響，結果發現1.5倍大的後視鏡樣本有最佳之視閱反應，故銀髮族偏好面積較大的後視鏡形式。第三階段以迴歸分析探討受測者眼睛至機車手把與後視鏡面中心距機車手把之垂直高度間的關係。得出代表兩者關係之迴歸估計式，可做為日後設計適合銀髮族之機車後視鏡參考。

As the low birth rate and the advances of medical technology, the world gradually into an aging society. The aging problem cause the elder people to degradation of visual and cognitive response, affecting the efficiency of using the product. Taiwan is a crowded country, motorcycles have become the most popular and flexible means of transportation. But in this such a crowded environment, motorcycle accidents always happen. According to the statistics of the Ministry of Transportation, the domestic motorcycle accident rate of senior citizens is much higher than forty percent. The most reason of the accidents is motorcycle riders did not pay attention to the surroundings, causing the rear car crashes or the collision when changing lanes. The rear-view mirror play a very important role when driving, because in addition to the front view, rear traffic information is also very important. This study aims to investigate the ergonomic preference and visual cognition of senior citizens on rear-view mirror, finding out the design factors of rear-view mirror that suit for senior citizens. The goal of this study is want to raise the driving safety and visual comfortable of rear-view mirror for elder motorcycle riders, reducing traffic accidents. Ergonomic experiments were divided into three stages in this study, we will investigate the difference of visual preference on different shape of the rear-view mirror in first phase. In this stage, we found senior citizens have the highest visual preference on rectangular rear-view mirror. The mirror size to the effect of the visual cognition is the topic of second phase, in the result we found the 1.5 times mirror size have the best response, so senior citizens preferred large rear-view mirror form. The final phase we use regression analysis to probe the relation between the vertical distance of subjects eyes to motorcycle handlebars and the vertical distance of motorcycle handlebars to the center of rear-view mirror surface. In this experiment, we obtained the regression estimation between this two variables. This result can be used on the design of motorcycle rear-view mirror for senior citizens in the future.

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