Assessment of Musculoskeletal Disorders and Visual Fatigue on Visual Inspection Task

• Main Authors: Chou, Zhen-Hui, 周振輝
• Other Authors: Wang, Min-Yang
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/tf492p

碩士 === 國立清華大學 === 工業工程與工程管理學系碩士在職專班 === 106 === Contact lens manufacturing process requires many steps, of which the visual inspection on the lens is the most labor-intensive procedure. And this inspection by labors’ eyes is not replaceable before any effective method was found. Contact lens examining is a light-weight and repetitive task. In the long-term engagement without any proper rest might cause visual and musculoskeletal effects. This study will be informed from the subjective assessment of (1) muscular-skeletal disorders (Nordic. Musculoskeletal Questionnaire, NMQ) and (2) visual fatigue to as a basis for evaluate discomfort and visual fatigue in the musculoskeletal area of the visual inspection task. In one of the assessment methods of Musculoskeletal Disorders, KIM-MHO will be used to engage in the Visual Inspection Task. The Visual Fatigue Critical Fusion Frequency (CFF) data were measured at the working station using flicker fusion frequency (Handy Ficker: HF, Japan) and the data were statistically analyzed and assessment. It is found that on the body musculoskeletal survey of 185 operators and KIM-MHO checklist of 5 staff members’ assessment, the longer working hours accumulate musculoskeletal disorders. The most effective impacts on the body are the repeatable action of hands and upper extremities with abnormal sitting position. It is found that the results on the visual fatigue subjective assessment survey of 185 operators and CFF of 60 visual inspection work area operators have a positive correlation, which was caused by the long working hours in everyday. In the gender differences on the comparison found, women’s musculoskeletal disorders and visual fatigue than man had more obvious effects. The more working hours are the main factors in musculoskeletal disorders and visual fatigue in visual task. If the working time is adjustable to reduce the repeatable action and eyes gaze time on daily work which could less the effect on musculoskeletal disorders and visual fatigue. The work environment improving like the working posture adjusted which work men sitting straight goes with human engineering design. Redesign suitable chairs and desktops in according the height of staffs and operators to avoid body bow and bow down. Design the hand tool for assisting to reduce hand grip and movement and with the wrist protection equipment, reduce the degree of wrist load.