放大鏡倍率、鏡面傾斜角度與作業面高度對於女性人員偵檢績效、視覺與肌肉疲勞之效應

The Effect of Magnification Times and Tilting Angles of Magnifying Glasses and the Heights of Work-Surface on Female Inspectors’ Performance, Visual and Muscle Fatigue

本研究旨在探討放大鏡鏡面傾斜角度 （0°、30°與60°）、放大鏡倍率 （3 倍與5倍） 及作業面高度 （坐肘高、坐肘高上5 cm和10 cm） 對於放大鏡偵檢作業員之閃光融合閾值 （CFF）、近點調節閾值 （NPA）、作業績效、視覺疲勞主觀評量和肌肉骨骼疲勞主觀評量等影響，本研究共募集12 位女性參與實驗，每位受試者以隨機化的順序進行18次的實驗組合，每次進行30分鐘的鋰電池模擬偵檢作業。資料經收集分析討論發現：（1） 放大鏡鏡面傾斜角度對於偵檢的元件數量、視覺疲勞主觀評量及肌肉疲勞主觀評量有顯著效應，最佳的放大鏡鏡面傾斜角度為60°，其次為30°，最差的為0°。（2） 放大鏡倍率對於閃光融合閾值、偵檢的元件數量和視覺疲勞主觀評量有顯著效應，3倍放大鏡顯著優於5 倍放大鏡。（3） 作業面高度對於視覺疲勞主觀評量和肌肉疲勞主觀評量有顯著效應，最佳為坐肘高上0公分，其次為坐肘高上5公分，最差的為坐肘高上10公分。（4） 整體來說，最佳的放大倍率為三倍放大，放大鏡鏡面傾斜角度為60°，作業面高度為坐肘高上0公分。

The purpose of this study was to evaluate the effects of tilting angles(tilt 0°, 30° and 60°), magnification power (3 and 5 times magnification) ofmagnifying glasses and the heights of work surface (elbow-level, +5 cm,+10 cm) on the critical fusion frequency (CFF), near point of accommodation(NPA), inspection performance, subjective visual strain rating (SVS)and subjective musculoskeletal strain rating (SMS) for visual inspection operators in a Li-ion battery factory. Twelve females were recruited asparticipants to perform 18 different experimental tasks. The participantswere instructed to perform a visual inspection task on a simulated Li-ionbattery circuit board over a 30-min period. The results showed that: (1)the tilting angle of magnifying glasses significantly affected CFF, inspectionperformance, SVS and SMS, and that 30° tilt was the best, 0° tilt wasthe second best, and 60° tilt was the worst; (2) magnification power hadsignificant effects on CFF, inspection performance and SVS, the 3 timesmagnification was better than 5 times; (3) work surface height alsosignificantly affected SVS and SMS, 5 cm above elbow-level was the best,10 cm above elbow-level was next, and elbow-level was the worst; (4)Overall, the optimum combination is 3 times magnification magnifyingglasses with 30° tilt angle on a work surface set 10 cm above elbow-level.