• 한국환경보건학회지
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• 제49권6호
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• pp.372-379
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• 2023

Background: Laundry workers are known to be exposed to organic solvents in various works including dry cleaning. Long-term exposure to organic solvents may cause adverse health effects among laundry workers. Objectives: To investigate the association between exposure to organic solvents and symptom of headache or eyestrain among laundry workers. Methods: The subjects were total 267 laundry workers who participated in the 6th Korean Working Conditions Survey (KWCS). Responses to exposure to 'inhalation of vapor from organic solvent' was categorized into two (non-exposed: rarely or absolutely not exposed during working hours; exposed: ≥1/4 working hours) or three (non-exposed; low exposure: 1/4 of the working hours; high exposure: ≥1/2 working hours) groups. Logistic regression analysis was performed to evaluate the association between exposure to organic solvents and symptom of headache or eyestrain in the last 12 months among laundry workers. Odds ratios (ORs) and the 95% confidence intervals (CIs) were calculated for experience of the symptom of headache or eyestrain with adjustment for age, sex, education, workplace size (by the number of workers), working hours per week, and current working period (year). Results: The proportions of exposure groups, i.e., non-exposed, low exposure, and high exposure, were 80.4%, 11.1%, and 8.5%, respectively. The proportion of those who had symptom of headache or eyestrain in the last 12 months was 18.7%. There was a significant association between exposure to organic solvents and experience of headache or eyestrain (OR=3.2, 95% CI=1.4~7.4). And, the proportion of those who experienced symptom of headache or eyestrain tended to increase significantly as the level of exposure to organic solvents increased (P_trend=0.002). Conclusions: Our results suggest that exposure to organic solvents are associated with symptom of headache or eystrain among laundry workers in Korea. However, further studies with more relevant design is needed to replicate the association.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
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• pp.1739-1741
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• 2007

A 3D projection display using stacked screens to display the near and far images, respectively, is developed. The front screen is made of a scattering polarizer film, and the far image on the rear screen is clearly visible through it. The image is perceived as three-dimensional, and no eyestrain is suffered.

• Safety and Health at Work
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• 제10권4호
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• pp.437-444
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• 2019

Background: Headache/eyestrain symptoms are common health problems that people experience in daily life. Various studies have examined risk factors contributing to headache/eyestrains, and physicochemical exposure was found to be a leading risk factor in causing such symptoms. The purpose of this study was to examine the relationship of headache/eyestrain symptoms with physicochemical exposure among Korean construction workers depended on worksite. Methods: This study used data from the 4th Korean Workers Conditions Survey and selected 1,945 Korean construction workers as participants. Multivariable logistic regression analysis was used to determine the relationship. Results: Exposure to vibrations among all construction workers affected the moderate exposure group [odds ratio (OR) 1.53, 95% confidence interval (CI) 1.01-2.32], the high exposure group (OR 1.77 95%CI 1.17-2.67), and the indoor high exposure group (OR 1.61, 95%CI 1.02-2.55) and among outdoor construction workers, the moderate group (OR 6.61, 95%CI 15.4-28.48) and the high group (OR 6.61, 95%CI 1.56-27.98). When exposed to mist, dust, and fumes, the indoor high exposure group was significantly affected (OR 1.63, 95%CI 1.07-2.47). All construction workers exposed to organic solvents were affected, high exposure group (OR 1.69, 95%CI 1.15-2.49) and indoor high exposure group (OR 1.77, 95%CI 1.08-2.89). The high exposure group in all construction worker (OR 1.70, 95%CI 1.20-2.42) and the indoor high exposure group (OR 1.83, 95%CI 1.17-2.89) also were affected by secondhand smoking exposure. Conclusion: Many physicochemical exposure factors affect headache/eyestrain symptoms among construction workers, especially indoor construction workers, suggesting a deficiency in occupational hygiene and health environments at indoor construction worksites.

• 한방안이비인후피부과학회지
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• 제10권1호
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• pp.91-121
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• 1997

These days many p대ple are disterbed from eyestrain and the number is on the increase. So, through the oriental and occidental books I studied pysical and breathing exercises to help overcome eyestrain. The result were as follows; 1. The most common way is to close your eyes and rub them with warm palms. Then press or rub your eyeballs simultaneously. 2. There are two ways to exercise the eyeball by itself. One way is by looking at only one spot and the other way is to look four ways-first up, down, left and right-and then rotate right and left. 3. There are many different opinions that of the degree of strenth to be used in pressing the eyeball. I came to the conclusion that if we want to relex the eyeball, you must press it gently but to strenthen it, you must press it hard. 4. This method is a common way to press orbit or acupuncture points of the peripheral eyeball. For example B-1(晴明), S-2(四白), B-2(찬죽), Tae-Yang(太陽), TE-23(絲竹空), etc. 5. Since eyestrain is related to the whole body, it is known that you can relex your whole body by pressing the acupuncture points located in the head and posteriores cerviicis or by stretching the upper half of the body. 6. The best time to pratice is early in the morning or when you feel eyestrain. But I couldn't find a consistent on breathing method or the amount of time to practice.

• 한국환경과학회지
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• 제20권2호
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• pp.175-183
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• 2011

This study was conducted to survey the subjective symptoms of workers and users in selected 5 public facility groups(offices, performance halls, private crammers, wedding halls and indoor sports facilities), located in Seoul, Daejeon and Chungnam Province. Overall as subjective symptoms that were worse at public facilities than those usual, following responses appeared: I have a headache, My eyes are dry or feel irritated or itching, I feel eyestrain or my eyes are bloodshot, My nose was stuffy, I have a cough, I feel dry in the throat or inflammation happens, I feel oppressed in the breast or sometimes have difficulty in breathing, My skin gets dry, My skin is itching or has some spots, I feel like vomiting, I feel easily tired or sleep, I lose my concentration and I feel my memory is falling, I feel dizzy, I feel depressed, I feel being sharp and feel tension, I feel muscular pain or stiffness on shoulders, back and neck. Also, we compare with normal subjective symptoms scores and subjective symptoms scores in public facilities. The highest subjective symptoms score in at normal was my skin gets dry(2.35 points) and subjective symptoms score in public facilities was I feel eyestrain or my eyes are bloodshot(2.61 points).

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.1033-1036
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• 2008

In this paper, we describe the development of the polarized-light stereoscopic monitoring system based on full HDTV. The system consists of the stereoscopic camera part, image processing device for the stereoscopic image recording and stereoscopic display. The developed stereoscopic imaging display system reduces eyestrain and viewer fatigue.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.425-427
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• 2004

Many of the problems by using the microscope are related to the fact that the eyes of the surgeon must be continually fixed to the microscope eyepieces. In this paper, we describe a development of the stereoscopic monitoring system of the stereo microscope for reduced eyestrain or operator fatigue about the long time observations of the microscope. The system consists of the stereoscopic camera part, the stereoscopic image processor device and the polarized light stereoscopic monitor. The left and right images obtained form the two CCD cameras are the same as the eyepiece images. By use of the image processor, the polarized light stereoscopic monitor displayed a real-time stereo microscope images.

• 아동학회지
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• 제15권2호
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• pp.55-68
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• 1994

A survey analysis of home video games was carried out for 1,018 elementary school children. Children responded to a questionnaire consisting of sociodemographic variables, degree of game participation(frequency and mean time), control behavior(eg. resting during games, lightening interior), and physical symptoms(eg. eyestrain, headache, trembling, paralyses) during and/or after playing games. Statistical analysis was done by frequency, percentile, and chitest. The results showed that many children enjoyed video games frequently and played continually, that few children did control behavior during games. Main variables related to degree of game playing and control behavior were sex, game experience, parent's education, and mother's activity. In particular, the results implied that the level of physical symptoms during and/or after game differed by lighting factors.

• 기술사
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• 제43권3호
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• pp.23-27
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• 2010

Since 3DTV was introduced, the market could not grow further due to the several causes such as the lack of content, technology for production and display and eyestrain. However, the rapid advances of the technologies on digital broadcasting, consumer electronics and computer enabled the commercialization of 3D animation, computer graphic, 3D advertising as well as 3D movies, and since then the international technical competition is growing fiercer. Since much more companies introduced the solutions for 3D in NAB 2010 than 2009, the expected size of the market will be bigger than ever before. This article describes the recent trends and the prospect of the 3D technologies including national defence strategy, content, construction, consumer electronics, advertisement, and terrestrial 3D1V pilot project in Korea.

• 한국직업건강간호학회지
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• 제31권2호
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• pp.95-103
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• 2022

Purpose: This study aims to identify general, workplace, and health-related characteristics of outdoor workers exposed to high temperatures, and to compare the risk of disease according to outdoor high temperature exposure. Methods: This secondary analysis study used the 5th Korean Working Conditions Survey (2017) to identify 4,915 outdoor workers exposed to high temperatures. Results: Outdoor workers exposed to high temperatures were mostly male, elderly, less educated, and daily contract workers. Most of them were engaged in agriculture, forestry and fishing, and construction industries. About 40~50% of them complained of musculoskeletal pain and overall fatigue. The results showed that high temperature exposure increased the risk of illness (hearing problem, skin problem, backache, muscular pains in upper and lower limbs, headache/eyestrain, injuries, depression, and overall fatigue) among workers. Conclusion: High temperature exposure might increase the risk of illness among workers. The results of this study demonstrated that the outdoor workers should be protected from high temperatures.