• 동의신경정신과학회지
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• 제23권2호
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• pp.59-66
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• 2012

Objectives : The purpose of this report was to examine the relation between ocular fatigue and dry eye symptoms in patients with ocular fatigue. Methods : 115 patients with ocular fatigue disease were included in this analyses. The study examination included a symptom interview that assessed stiff sense, foreign body sense, pain, soreness, redness, etc. and ocular fatigue. Results : The survey showed in subjective ocular fatigue in all subjects. All patients(115) reported symptoms of ocular fatigue and 25.2% (29/115) were diagnosed as having dry eye with symptoms. Conclusions : These findings suggest that there is a strong between ocular fatigue and dry eye.

• 한방재활의학과학회지
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• 제28권2호
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• pp.105-111
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• 2018

Objectives The purpose of this study was to examine the effects muscle fatigue at the knee muscles on balance during standing in healthy adults. Methods Thirty healthy adults were recruited along with their written informed consent. Subjects were randomly assigned to knee extensor group (fatigue on knee extensor, KE), and knee flexor group (fatigue on knee flexor, KF). And subjects performed exercise with each muscle group until muscle fatigue was induced. They were assessed balance ability by functional reaching test (FRT), limit of stability (LOS), and postural sway (one leg standing, normal eye open (NO), normal eye close (NC), pillow with eye open (FO), and pillow with eye close (FC)) before and after fatigue. Results There were significant group differences balance performances in FRT, anterior of limit of stability, one leg standing, and the muscle fatigue of knee muscles were decreased balance performances. The balance performance was affected by visual sense and proprioception. Conclusions These results show that the muscle fatigue of knee muscles decreased balance performance. Therefore, balance exercise program should be trained without muscle fatigue.

• 지역사회간호학회지
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• 제25권4호
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• pp.259-269
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• 2014

Purpose: The purpose of this study was to examine dry eye syndrome and ocular fatigue according to the status of contact lens wearing and management among female university students. Methods: The subjects were 195 female university students wearing contact lenses. Ocular Surface Disease Index (OSDI) and Virtual Reality Symptom Questionnaire (VRSQ) were used to determine the level of dry eye syndrome and ocular fatigue. The SPSS/WIN 21.0 program was used for analysis of data. Results: Significant differences in the level of dry eye syndrome were observed according to the period of case solution change (F=3.36, p=.037) and the reasons for the change of lens (F=4.56, p=.004). In ocular fatigue, significant differences were observed according to the price of lens (F=3.53, p=.031), rinse in storing lens in a case (t=-2.57, p=.011), and learning about contact lens (t=-2.01, p=.046). A significant positive correlation was observed between dry eye syndrome and ocular fatigue in the subjects. Conclusion: The results of this study show that some subjects have problems in wearing and management of contact lenses. Therefore, an education program related to contact lenses should be provided to contact lens wearers to improve the status of wearing and management of contact lenses.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2019년도 춘계학술대회
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• pp.21-23
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• 2019

본 연구는 안구 피로 감소를 위해 VR 기기 프로토타입을 개발하고자 한다. VR 기기가 대중화되면서 안구 피로를 호소하는 사례들이 빈번해지고, 더 나은 미래를 위해서 VR 기기의 문제점을 잘 보완하고 정비하여 4차 산업혁명의 빠른 속도와 역동적인 환경을 편한 마음으로 누릴 수 있길 바란다. 본 연구에서는 VR 기기에 대한 설명, 안구 피로 관련사례, 안구 피로 감소를 위한 타임아웃 센서 및 안구마사지 기능이 있는 VR 기기를 디자인 하였고 VR 기기 프로토타입을 개발하였다. 이러한 기능들은 인체에 유해한 전자파를 차단하여 장시간 사용해도 피로감을 줄이는데 도움을 줄 수 있을 것이며, 앞으로 VR의 미래가 발전될 수 있을 것이다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1989년도 하계종합학술대회 논문집
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• pp.153-157
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• 1989

In this paper, a new method of Eye Movement Pattern Encoding (EMPE) which is based on electrooculography(EOG) was suggested for the purpose of effective communication between man and machine, instead of Point-Of-Regard-Selection (PORS) method. Also, ocular interface is designed and the typing aid, eye-pattern writer, was constructed for the test of theoretical validity and its practical aspect. Effect of eye fatigue on the performance of ocular interface was quantified through fatigue test.

• 대한인간공학회:학술대회논문집
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• 대한인간공학회 1994년도 춘계학술대회논문집
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• pp.32-37
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• 1994

This paper surveys the various methodologies for the objective measurement of visual fatigue. Visual fatigue is a psychophysiological symtom caused by the excessive use of eyes and it can be used as an important measure of the effectiveness and the safety of visual displays. The purpose of this paper is to compare the various visual fatigue measurement methodologies in a sense of the suitability for the ergonomic research. The measurement methodologies based on accommodation, convergence, visual evoked potential, eye movement, eye blinking, and flicker fusion were discussed and compared.

• Journal of Mechanical Science and Technology
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• 제16권8호
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• pp.1109-1116
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• 2002

To investigate the effect of nitriding layer on both fatigue crack initiation and fatigue life, turbine rotor steel ( IC.- 1Mo-0.25V steel) specimens were nitrided by the nitemper method and then put to a rotary bending fatigue test at room and elevated temperatures. In nitriding, temperature and time were controlled to obtain a different nitrided thickness. Microstructure analysis, micro-Victors hardness test, and scanning electron microscope observation were carried out for evaluating experiments. In results, the fatigue cracks of nitrided specimens were initiated at inclusion near the interface between nitrided layer and substrate, which showed fish-eye type appearance in fractograph. The fatigue life of nitrided specimens at every temperature was prolonged compared to that of the non-nitrided. However, there was not observable improvement in fatigue characteristics with the increase of a nitrided thickness.

• 한국임상보건과학회지
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• 제10권2호
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• pp.1594-1599
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• 2022

Purpose. To investigate the relationship between changes in eye temperature and eye fatigue according to smartphone usage time. Methods. 15 adults in their 20s were asked to watch a smartphone, and the ocular surface temperature was measured 5 times each using a non-contact infrared thermometer every 10 minutes, and the change was observed. Result. The ocular surface temperature was 36.40℃ at the center of the cornea before watching the smartphone, but increased by 0.19℃ to 36.59℃ after watching the smartphone (SD 36.50±0.10). In addition, in the case of the sclera, it was found that the increase was 0.1℃ from 36.48℃ before viewing to 36.58℃ after viewing (SD 36.53±0.05). Conclusion. It was found that there is a close relationship between smartphone use and changes in eye temperature. In the future, it is thought that the ocular surface temperature can be used as basic data to objectively evaluate eye fatigue.

• 한국엔터테인먼트산업학회논문지
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• 제14권6호
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• pp.191-199
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• 2020

젊은 세대들은 스마트폰, 텔레비전, 컴퓨터 등 다양한 시각 매체들의 발달로 눈을 많이 사용함으로써 눈의 건강도 약화되고 있다. 이에 본 연구에서는 안구운동과 치료적 마사지로 안구근육을 자극하여 눈건강과 동체시력에 미치는 영향을 알아보고자 하였다. 20대의 대학생 38명을 대상으로 대조군(18명)과 실험군(20명)으로 나누고, 실험군은 안구운동과 치료적 마사지를 매일 30분씩, 주 5회, 4주 동안 실시하였다. 눈 피로도, 눈 뜬 상태 유지 시간, 안구표면온도, 동체시력은 연구 전과 4주 후에 측정하였다. 4주 후 눈피로도는 유의하게 감소하였고(p<.05), 눈 뜬 상태 유지 시간은 유의하게 증가하였다(p<.05). 안구표면온도는 유의한 차이가 나타나지 않았고(p>.05), 동체시력은 유의하게 증가하였다(p<.05). 따라서, 눈의 기능 증진과 눈 건강을 위하여 안구운동과 치료적 마사지를 권장한다. 눈 건강을 회복하고 예방하기 위한 연구자료로 활용되길 기대한다.

• 대한한의학회지
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• 제24권2호
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• pp.109-120
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• 2003

Objectives: This study was conducted to evaluate the clinical efficacy of EC102, a composition containing oriental medicine, for relieving VDT syndrome, including eye symptoms and musculo-skeletal symptoms. Methods: The study was conducted by using a double blind randomized controlled trial design. 40 subjects were randomly assigned to the placebo group or the EC102 group. The visual analogous scale (VAS) was used to evaluate various VDT symptoms, including eye pain, eye fatigue, back pain, shoulder pain and so on. Refractory indexes were measured using refractometer, and tear film break-up time (BUT) were measured using fluorescein strip. Blood circulation was measured using photo-plethysmography. Blood pressure and blood biochemistry were also measured. Statistical analysis was conducted by a Mann-Whitney test using SPSS 9.0 software. Results: The EC102 group showed a statistically significant reduction of eye symptoms including eye fatigue, eyelid fatigue, itching, pain, and photophobia when compared with the placebo group (P<0.05). The EC102 group also showed a statistically significant reduction of back pain compared with the placebo group (P<0.05). No side effects on liver function and blood biochemistry were observed. Conclusions: EC102 has significant clinical efficacy for relieving symptoms of VDT syndrome.