Typescript, etc. / Digitized by Kansas State University Libraries

Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2008. / Includes bibliographical references (p. 85-90).

Thesis (Ph. D.)--Ohio State University, 2003. / Title from first page of PDF file. Document formatted into pages; contains xvii, 211 p.: ill. (some col.). Includes abstract and vita. Advisor: William S. Marras, Dept. of Industrial, Welding, and Systems Engineering. Includes bibliographical references (p. 177-206).

Call number: LD2668 .T4 1984 S27 / Master of Science

Call number: LD2668 .T4 1985 M54 / Master of Science

This study appears to be one of few intervention studies with focus on eyestrain and lighting on non-computer workplaces. Previous studies have shown strong connections between eyestrain and musculoskeletal strain. The eyes “lead the body” and if the picture on the retina is unfocused the body adjusts the posture, trying to improve the image through changing the viewing distance. This can lead to an unnatural body posture which can contribute in the development of musculoskeletal disorders. A good visual environment with proper illuminance, good luminance contrast relationship, good uniformity value of the illuminance and no glare are the best conditions in order to function well at a visually demanding work. Sorting mail is a task that needs good visual ergonomics and can therefore be improved by a change in the visual environment. The overall purpose of this thesis is to investigate if a good visual environment have an impact on eyestrain, musculoskeletal strain, productivity, wellbeing, and work induced stress. This thesis is based on a literature review and a lighting intervention, with one part before the intervention and two follow-up parts, summer and winter. The results are based on objectively measurements; lighting, time studies, and optometric eye examinations, and two questionnaires. The first questionnaire concerned visual ergonomics and the second had a focus on wellbeing and experience of work related tasks. The postmen experienced the new lighting and labeling as improvement. A small decrease in the amount of eyestrain was present, and the younger postmen had a decrease of the musculoskeletal strain. The postmen with eyestrain got a small improvement of the sorting time. When the lighting was improved another factor that could cause strain appeared, the need for good correction in their glasses was identified as the main remaining factor that could cause the observed strain. / Report code: LiU-Tek-Lic-2008:8.

<p>This study appears to be one of few intervention studies with focus on eyestrain and lighting on non-computer workplaces. Previous studies have shown strong connections between eyestrain and musculoskeletal strain. The eyes “lead the body” and if the picture on the retina is unfocused the body adjusts the posture, trying to improve the image through changing the viewing distance. This can lead to an unnatural body posture which can contribute in the development of musculoskeletal disorders.</p><p>A good visual environment with proper illuminance, good luminance contrast relationship, good uniformity value of the illuminance and no glare are the best conditions in order to function well at a visually demanding work. Sorting mail is a task that needs good visual ergonomics and can therefore be improved by a change in the visual environment.</p><p>The overall purpose of this thesis is to investigate if a good visual environment have an impact on eyestrain, musculoskeletal strain, productivity, wellbeing, and work induced stress.</p><p>This thesis is based on a literature review and a lighting intervention, with one part before the intervention and two follow-up parts, summer and winter. The results are based on objectively measurements; lighting, time studies, and optometric eye examinations, and two questionnaires. The first questionnaire concerned visual ergonomics and the second had a focus on wellbeing and experience of work related tasks.</p><p>The postmen experienced the new lighting and labeling as improvement. A small decrease in the amount of eyestrain was present, and the younger postmen had a decrease of the musculoskeletal strain. The postmen with eyestrain got a small improvement of the sorting time. When the lighting was improved another factor that could cause strain appeared, the need for good correction in their glasses was identified as the main remaining factor that could cause the observed strain.</p> / Report code: LiU-Tek-Lic-2008:8.

Digitala verktyg förekommer allt mer i skolan vilket leder till att lärare behöver ha kunskap om hur de digitala verktygen kan påverka elevers kunskapsutveckling. Syftet med denna litteraturstudie är därför att belysa eventuella skillnader mellan skärmläsning och traditionell läsning angående läsförståelse, läshastighet och fysisk påverkan på läsaren. Mot denna bakgrund formulerades tre frågeställningar: • Vilka möjliga skillnader i läsförståelse skildras i en jämförelse av skärmläsning och traditionell läsning? • Vilka slutsatser kan dras angående läshastighet vid traditionell läsning gentemot skärmläsning? • På vilka sätt kan skärmläsning eventuellt påverka läsaren fysiskt? För att få svar på frågeställningarna har flera vetenskapliga publikationer analyserats och förts in i en analytisk tabell. Texternas relevans i förhållande till studiens syfte avgjordes med hjälp av uppsatta kriterier gällande skärmläsning, läsförståelse och publiceringsår. Om materialet uppfyllde kriterierna inkluderades det i urvalet. Urvalet består av flera internationella tidsskriftartiklar och en svensk doktorsavhandling.Beträffande studiens två första frågeställningar visar resultatet inget tydligt svar. Flera studier hävdar att det inte är någon skillnad i läsförståelse och läshastighet vid traditionell läsning och skärmläsning, medan andra studier hävdar att det finns tydliga skillnader. Gällande studiens tredje frågeställning visar resultatet att skärmläsning påverkar läsaren fysiskt i form av eyestrain. Någon slutsats angående läsförståelsen och läshastighet har inte kunnat dras, men den fysiska påverkan verkar göra att majoriteten anser att traditionell läsning är behagligare än skärmläsning.

Quantitative, descriptive, cross-sectional study was conducted to determine the level of knowledge and extent of Computer Vision Syndrome (CVS) among computer users in the Securities and Exchange Commission (SEC), Abuja, Nigeria. Structured questionnaires were administered to 100 computer users aged between 18 and 40 years. The study findings revealed that 40 respondents (40%) were aware of CVS and 27 (27%) of them had knowledge of the disorder. 74 (74%) of the respondents experienced at least one symptom of CVS. Headache and eyestrain were the most common symptom of CVS among the population. The study also revealed that the internet (accounting for 50%) was the major source of information about CVS awareness. The study concluded that 27% knowledge level is too low and much emphasis is needed to educate the people at risk of CVS / Health Studies / M.A. (Public Health)

Quantitative, descriptive, cross-sectional study was conducted to determine the level of knowledge and extent of Computer Vision Syndrome (CVS) among computer users in the Securities and Exchange Commission (SEC), Abuja, Nigeria. Structured questionnaires were administered to 100 computer users aged between 18 and 40 years. The study findings revealed that 40 respondents (40%) were aware of CVS and 27 (27%) of them had knowledge of the disorder. 74 (74%) of the respondents experienced at least one symptom of CVS. Headache and eyestrain were the most common symptom of CVS among the population. The study also revealed that the internet (accounting for 50%) was the major source of information about CVS awareness. The study concluded that 27% knowledge level is too low and much emphasis is needed to educate the people at risk of CVS / Health Studies / M.A. (Public Health)