• 제목/요약/키워드: Eye contact

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A Study on the Confidence of Dry Eye Diagnosis Methods (건성안 검사 방법의 신뢰도에 대한 연구)

  • Lee, Byeong Jun;Hong, Jae Hyeon;Jung, Dai;Park, Mijung
    • Journal of Korean Ophthalmic Optics Society
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    • v.13 no.1
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    • pp.15-20
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    • 2008
  • Purpose: To study on the confidence of dry eye diagnosis methods which need to prescribe contact lens. Methods: Non-invasive tear film break-up time (NIBUT) and tear film break-up time (TBUT) were measured in forty healthy subjects in their 20s, and then the subjects were classified into normal eye and dry eye. The results of McMonnies questionnaire, tear prism height measurement, Hardtack test, blink rate measurement and Schirmer test were compared with the results of NIBUT and TBUT. Results: The results of NIBUT and TBUT were as follows; 20 subjects had normal eyes, 10 subjects had dry eyes in both NIBUT and TBUT, and 10 subjects showed different results. In McMonnies questionnaire, the score of normal eye group averaged 8.2 and that of dry eye group averaged 18.5, which showed statistically significant difference. Furthermore, 100% of normal eye group classified by the results of NIBUT and TBUT corresponded with the result of McMonnies questionnaire and 90% of dry eye group showed the correspondence. Tear prism height of normal eye group averaged 0.32 mm and that of dry eye group averaged 0.23 mm, which were significantly different. Hardtack test, blink rate measurement and Schirmer test without local anesthesia showed no statistically significant difference between normal eye group and dry eye group. Conclusions: On dry eye diagnosis methods, the results of McMonnies questionnaire and tear prism height measurement had close correlation with the results of NIBUT and TBUT.

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The Corneal Effects Induced by Ultraviolet Radiation (자외선에 의한 각막의 영향)

  • Kim, Douk Hoon
    • Journal of Korean Ophthalmic Optics Society
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    • v.7 no.2
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    • pp.229-234
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    • 2002
  • The human eye and skin is exposed daily to solar energy. Expecially, the ultraviolet radiation (UVR) exposure has been damaged as an important causative factor in corneal disease. These damage of cornea was effected the retina. Therefore the eye function was effected very significant damage. As a results the protect of UVR in the eye is very important in ocular health. Therefore in living the intensive ultraviolet radiation environment by solar energy, human eye have protected the cornea and eyeball by the UV-blocking sunglass, eyeglass, goggles, and contact lens. Finally the specific UV-blocker lens devices available to the primary care for the subjects by optician. Of course, in the future these specific lenses have to development and study by fellowship.

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A Study on the Skin and Eye Testing of para-phenylenediamine and commercial hairdyes containing paraphenylenediamine in animals (실험동물에 대한 para-phenylenediamino을 함유하는 염모제의 피부 및 눈에 대한 시험)

  • Kim, Jung-Jin;Lee, Sun-Woo;Yong, Km-Chan
    • YAKHAK HOEJI
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    • v.38 no.5
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    • pp.562-567
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    • 1994
  • Now para-phenylenediamine(PPDA) is generally used as component of most hairdyes because it can be used more conveniently and effectively than the others. But PPDA become known to cause side effects such as skin sensitization, contact dermatitis and eye irritation. So this study was done to restudy the safety of hairdyes containing PPDA. The results of experiment were as follows. 1. As a result of primary skin irritation test and eye irritation test in white rabbits, the solution containing 5% PPDA(in saline) were classified as weak irritant but four kinds of commercial hairdyes containing PPDA were proved not to have any irritation. 2. As a result of skin sensitization test in guinea pig, four kinds of commercial hairdyes were classified as Calss I(week irritant) but three kinds of commercial hairdyes induced skin sensitization for guinea pig to 5% in test groups. These results indicate that the actual toxicity of commercial hairdyes(four kinds) is negligible. But based on the results of experiment, it is thought that there is possibility of some commercial hairdyes to induce skin sensititization.

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A Study on Health Promoting Behaviors and Health Problems in Contact Center Consultants (일 지역 컨택센터 상담사의 건강증진행위와 건강문제에 관한 연구)

  • Seo, In-Ju;Park, Jeong-Sook
    • Korean Journal of Occupational Health Nursing
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    • v.19 no.1
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    • pp.14-27
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    • 2010
  • Purpose: The purpose of this study was to identify health promoting behaviors and health problems in contact center consultants, and to provide basic data in order to develop health promoting interventions for these people. The subjects were 680 consultants randomly selected from 6 contact centers out of 31 in D city. The data were collected from March 20, to March 28, 2008. Methods: The tools for this study were HPLP II developed by Walker et al. (1995) that was modified and translated by Park (2005) and modified CMI for contact center consultants based on CMI developed by Bordman (1994). The data were analyzed by descriptive statistics, t test, ANOVA, and Scheffe test with the SPSS WIN 14.0 program. Results and Conclusion: The contact center consultants' health promoting behavior was in a low level and they had certain health problems related to their job such as eye, ear and throat. In consideration of contact center consultants' job characteristics, health education should be provided with the development of systematic health programs.

Development of a Non-contact Input System Based on User's Gaze-Tracking and Analysis of Input Factors

  • Jiyoung LIM;Seonjae LEE;Junbeom KIM;Yunseo KIM;Hae-Duck Joshua JEONG
    • Korean Journal of Artificial Intelligence
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    • v.11 no.1
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    • pp.9-15
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    • 2023
  • As mobile devices such as smartphones, tablets, and kiosks become increasingly prevalent, there is growing interest in developing alternative input systems in addition to traditional tools such as keyboards and mouses. Many people use their own bodies as a pointer to enter simple information on a mobile device. However, methods using the body have limitations due to psychological factors that make the contact method unstable, especially during a pandemic, and the risk of shoulder surfing attacks. To overcome these limitations, we propose a simple information input system that utilizes gaze-tracking technology to input passwords and control web surfing using only non-contact gaze. Our proposed system is designed to recognize information input when the user stares at a specific location on the screen in real-time, using intelligent gaze-tracking technology. We present an analysis of the relationship between the gaze input box, gaze time, and average input time, and report experimental results on the effects of varying the size of the gaze input box and gaze time required to achieve 100% accuracy in inputting information. Through this paper, we demonstrate the effectiveness of our system in mitigating the challenges of contact-based input methods, and providing a non-contact alternative that is both secure and convenient.

Evaluation of Vision-Specific Quality of Life between Spectacles and Contact Lens Wearers (안경과 콘택트렌즈착용자의 삶의 질 평가)

  • Kang, Sue Ah;Kim, Jung Hee
    • Journal of Korean Ophthalmic Optics Society
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    • v.12 no.3
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    • pp.111-115
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    • 2007
  • Purpose: The aim of this study was to assess vision-related quality of life and modes of refractive error correction. We administered NEI-VFQ (National Eye Institute Visual Function Questionnaire) to 137 subjects in two modes of refractive error correction: spectacles and contact lens wearers. The NEL-VFQ was developed to assess vision-related quality of life with respect to 1) visual symptoms 2) social function as well as difficulty with tasks and symptoms 3) economic issues and health concerns 4) psychological well-being. The NEL-VFQ was translated from English into Korean. Methods: All data were analyzed using SAS 8.0. Student's T-test was conducted to determine significant differences in each of the subscale (${\alpha}=0.05$). Result: The Peripheral Vision subscale score ($mean{\pm}SD$) was $52.2{\pm}32.7$ for the spectacle wearers, $88.6{\pm}18.1$ for contact lens wearers; the spectacle wearers' Peripheral Vision score was significantly lower than contact lens wearers (p=0.0001). There were also significant differences between two groups detected in Color Vision (p=0.001), General Vision (p=0.01) and Health Perception (p=0.01). Conclusion: Contact lens wearers and spectacle wearers were mostly high vision-related quality of life except General Vision and Health Perception. Especially, contact lens wearers were higher vision-related quality of life than spectacle wearers. Further studies on developing of good quality of contact lens will be needed to improve quality of life in ametropia.

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Model on the Contact Lens Movement from Eye-lid Blinking (순목 작용에 의한 콘택트 렌즈의 운동 모델)

  • Kim, Daesoo
    • Journal of Korean Ophthalmic Optics Society
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    • v.9 no.1
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    • pp.145-159
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    • 2004
  • A mathematical model and its computer solution program were proposed to analyze the motion of contact lenses which are being subject to lid-blinking. The equation was derived by incorporating an acceleration induced lid's force exerting on the contact lens, the viscous damping resistance in the tear layer beneath the lens and the sliding frictional force between the lid and the contact lens surface into the formulation of differential equation describing the vibration. The model predicts the time-dependent displacement from the equilibrium postion during/after the blinking. During the blinking, as the time for the completion of one cycle of blinking decreases the off-the-equilibrium displacement of contact lens increases while the decrease of diameter in the contact cause the opposite effect. It is found that lid pressure exerting on the lens cause an insignificant lens displacement from the equilibrium position. After blinking the frequency of damped oscillation of contact lens decreases as the diameter of lens increases, due to the incresed surface while the reduced blinking time does not cause a significant frequency change. This is because that driving force for the contact lens movement posterior to blinking is the capillary-induced force not the lid force.

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The Change of the Near Eye Position according to the Spectacle and Contact Lens Wearing (안경과 콘택트렌즈 착용에 따른 근거리안위의 변화)

  • Han, Sun-Hee;Kim, Bong-Hwan;Kim, Hak-Jun;Park, Jun-Sung;Park, Hae-Been;Kim, Mi-Jeong;Park, Ju-Hyeong;Kim, Jin-Sol;Lee, Kyeong-Hoon;Kim, Jong-Hwan;Ha, Na-Ri
    • Journal of Korean Clinical Health Science
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    • v.3 no.4
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    • pp.435-443
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    • 2015
  • Purpose. This study was to investigate comparison of the near eye position according to the spectacle and contact lens wearing. Methods. We measured the AC/A ratio and near horizontal phoria using modified Thorington method in each case spectacle and contact lens wearing of equivalent spherical power after measuring the full corrected diopter for 20 subjects (men 5, woman 15, $21.15{\pm}1.35$ years) without specific ocular diseases, ocular surgery experience and vision anomalies. Results. It was shown high correlation between spectacle and contact lens wearing as AC/A ratio is a correlation coefficient 0.99 (p=0.00), near horizontal phoria is a correlation coefficient 0.95 (p=0.00). And contact lens wearing increased as AC/A ratio by $0.32{\pm}1.35$ ${\Delta}/D$ (p=0.31) and near horizontal phoria by $-0.17{\pm}2.18$ ${\Delta}$ (p=0.73) than spectacle wearing but there was no statistically significant difference. As the higher myopic grade AC/A ratio increased and then was shown decreased tendency in -6.00 D < $SED{\leq}-4.00$ D group (p>0.05) and as the higher myopic grade near exophoria increased but there was no statistically significant difference (p>0.05). Conclusions. We should consider that the subjects who had the lower AC/A ratio or higher near exophoria in -6.00 D < $SED{\leq}-4.00$ D group were necessary to measure AC/A ratio and near horizontal phoria when they were wearing contact lens because contact lens wearing tended to increase the near exophoria than spectacle wearing.

Optical Models of the Finite Schematic Eyes for Presbyopia (노안을 위한 정밀 모형안 설계)

  • Baarg, Saang-Bai
    • Korean Journal of Optics and Photonics
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    • v.19 no.6
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    • pp.439-447
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    • 2008
  • There is a need for a finite schematic presbyopic eye that models vision and image quality under various conditions such as cataract or refractive surgery, as well as near vision corrections with an ophthalmic lens or contact lens. Using recently measured biometric data of presbyopic eyes, new model eyes were designed that are optically and anatomically close to real eyes. The parameters changing significantly with age were incorporated into models for four different age groups. The new model eyes have alpha angle, decentered pupil, aspheric GRIN lens and aspheric retinal surface. It is likely that the new finite presbyopic model eyes will be useful for designing visual instruments such as low vision aids, PALs, IOL and contact lenses, and for the clinical prediction of the retinal image quality of a presbyopic patient.

Studies on the Correlation between SPF index and Primary Irritation Index of Octylmethoxycinnamte (Octylmethoxycinnamate의 SPF 지수와 피부자극지수와의 상관성 연구)

  • 서수경;김종원;최주영;서경원;박창원;김규봉;김광진;이선희
    • Environmental Mutagens and Carcinogens
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    • v.22 no.4
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    • pp.296-302
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    • 2002
  • In recent years, the safety of sunscreens have been challenged based on the reports of its adverse effects on users; dermatitis, allergic contact dermatitis, photoallergic contact dermatitis. In the toxicological aspect, the need to investigate the safety of sunscreens is steadily increasing. However, there were few studies on the correlation between sun protection factor (SPF) and the safety of sunscreens. The objective of this study was to assess whether there was a correlation between SPF and the skin irritation index of sunscreens. Octyl methoxycinnamate (OMC) was selected, which was the most frequently used (about 92% in korea and about 90% in the world) in sunscreens. In vitro SPF test was performed using the standard samples recommended by KFDA guideline. We examined primary and cumulative skin irritation and eye irritation of OMC standard sample as well as homosalate. As in vitro SPF was increased, skin irritation index was increased in primary skin irritation test ($r^2$=0.986) and cumulative skin irritation test ($r^2$=0.939). In addition, OMC was non-irritating and non-sensitizing. In this results, there was a good correlation between SPF index and skin irritation index.

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