연성 콘택트렌즈 관리교육의 이해도,만족도 조사

신장철(Jang Cheol Shin) 한국안광학회 2002 한국안광학회지 Vol.7 No.2

연성 콘택트렌즈의 관리 및 정기검사 실태

신장철(Jang Cheol Shin) 한국안광학회 2000 한국안광학회지 Vol.5 No.2

This study has analyzed soft contact lens care-after-sale and periodic examinations at optical shops and eye clinics. And I wish to make that use of educational data for the soft contact lens lesson of the department of ocular optics. This questionnaire studied the status of care for soft contact lens and periodic examination. of students who wears soft contact lens. The results are as follows ; First. 7.5% of students questioned wore soft contact lens. More women than men wore soft contact lens. The soft contact lens wearers purchased lens mainly at optical shops. 78.5% of them wore daily wear lens. Because of cosmetic advantages of soft contact lens. 47.9% of them wore soft contact lens. 72.5% of them wore soft contact lens less than 12 hours per a day. 32.0% of them has worn soft contact lens more than 6 months less than 1 year. 51.1% of them experienced irritation. 39.7% of them have exchanged soft contact lens between 6 and 9 months. Secondly. when purchasing lenses. 60% of soft contact lens wearers were given instructions of general care, such as duration of wearing lens, how to remove protein, how to store, and how to sterilize at both of eye clinics and optical shops. But the proportion of instructions, such as side effects and periodic examination which were given to soft contact lens wearers, is lower both at eye clinics and optical shops. Especially at optical shops, the proportion of instruction for periodic examination, is lower than at eye clinics(p$lt;0.05). Thirdly. The proportion of operations of periodic examinations after use of soft contact lens both at eye clinics and optical shops, is low. The soft contact lens wearers have had more periodic examinations at eye clinics than at optical shops. But the rate of non-periodic examination at optical shop is 87.9%. And for periodic examinations, general care was done at optical shops. On the other hand, eye examinations, general care, and treatments were done more at eye clinics. Fourthly. 60.3% of the soft contact lens wearers understood the necessity of the periodic examinations, but actually, only 6.4% of them were given the schedule for the periodic examinations, and 2.5% of them were given at an optical shop(p$lt;0.01).

연령에 따른 근시성 난시안의 분포변화

장준규(Jun-Gui Jan),신장철(Jang-Cheol Shin),최운상(Woon Sang Choi) 한국안광학회 2017 한국안광학회지 Vol.22 No.3

Purpose: The purpose of this study was to evaluate the astigmatism power change, distribution change of astigmatism and correlation according to age among total astigmatism, corneal astigmatism and residual astigmatism in myopic astigmatism eyes. Methods: The changes of total astigmatism, corneal astigmatism and residual astigmatism was analyzed according to age in 166 patients(332 eyes) with equivalent refractive power is over -0.50 D. Results: Total with-the-rule astigmatism increased to +1.18±1.13 D at 21~30 years of age and gradually decreased to +0.64±1.16 D at 31~40 years of age and at age 51~60, against-the-rule astigmatism was -0.40±1.12 D. Corneal with-the-rule astigmatism increased to +1.54±0.93 D at 21~30 years of age, then decreased gradually from 31~40 years of age to +0.27±0.94 D at 51~60 years of age. Residual astigmatism was against-the-rule astigmatism at all ages and according to the age did not significantly change. Correlation between total astigmatism and corneal astigmatism were r = 0.892, and total astigmatism and residual astigmatism were r = 0.613, corneal astigmatism and residual astigmatism were correlated with r = 0.184. Conclusions: Total astigmatism and corneal astigmatism were progressed from with-the-rule astigmatism to against-the-rule astigmatism as the age increased. Total astigmatism appeared 10 to 15 years late. Residual astigmatism showed an increase in against-the-rule astigmatism, but the change was not significant. The changes in total astigmatism were highly correlated with changes in corneal astigmatism.

여자 중·고등학생들의 굴절이상 눈에 대한 연구

김덕훈(Douk Hoon Kim),신장철(Jang Cheol Shin) 한국안광학회 1999 한국안광학회지 Vol.4 No.2

To investigate the visual acuity of the women middle and high school students, the visual acuity test was performed the object and subject methods. The results were as follows; 1. The eye types were 96.7% positive for myopia, 2.5% for emmetropia, and 0.8% for hyperopia , respectively. 2. The abnormal refraction eyes were 61% positive for simple myopia, 35.2% for myopitic compound astigmatism, 3% for myopic simple astigmatism, and 0.8% for simple presbyopia, respectively. 3. The asix of astigmatisms were 95% positive for irregular astigmatism axis, 3% for regular astigmatism axis, and 2% for oblique astigmatism axis, respectively. 4. On the total myopic spheric power, the -0.50$lt;spheric equivalent $lt;-2.00 diopter was 35.5%, the -2.00 $lt; spherical equivalent $lt; -6.00 diopter was 56.6%, and anything over the -6.00 diopter was 7.9%. 5. On the astigmatic power, the 0.50$lt;cylinder $lt;1.00 diopter was 66.7%, the 1.00 $lt; cylinder $lt;2.00 diopter was 27.8%, and anything over the 2.00 cylinder diopter was 5.5%. 6. The Pupillary distance presented from 54㎜ to 68㎜, in most cases, the pupillary distance was 60㎜ and 62 ㎜.

소프트콘택트렌즈의 표면 및 내부 친수성 평가

박혜림(Hye Lim Park),신장철(Shin Jang Cheol),김소라(So Ra Kim),박미정(Mijung Park) 한국안광학회 2017 한국안광학회지 Vol.22 No.3

Purpose: The aim of this study was to investigate the difference between the surficial and internal hydrophilicity of soft contact lenses (hereinafter soft lenses) due to the presence or absence of wetting agents and dyes. Methods: The surface and interior of 9 types of soft lenses available in the domestic market were stained with Sudan IV solution according to the modified Jacob method. The degree of hydrophilicity was determined by the converted concentration from the absorbance of Sudan IV extract obtained from the lenses according to the calibration curve. Results: The hydrophilicity of the soft lenses was improved five times and more by the inclusion of wetting agent, and the improvement degree of the hydrophilicity was varied depending on the type of soft lenses. Depending on the presence or absence of dyes, the degree of hydrophilicity of the surface and interior of the soft lenses was changed, and the hydrophilicity of the surface and the interior was influenced by the location of dye. Conclusions: From the present study, it was revealed that wetting agents and dyes affect the surface and internal hydrophilicity of soft lenses. Thus, the effect on hydrophilic properties may affect various material properties of soft lenses as well as comfortness.

좌ㆍ치골 결핵

문명상(Myung-Sang Moon),옥인영(In-Young Ok),하기용(Kee-Young Ha),신장철(Jang-Cheol Shin) 대한정형외과학회 1987 대한정형외과학회지 Vol.22 No.6

아이라이너의 착색성분에 따른 소프트콘택트렌즈의 착색차이

변현영(Hyun Young Byun),유현정(Hyeon Jung Yu),최승혜(Seung Hye Choi),신장철(Jang Cheol Shin),김소라(So Ra Kim),박미정(Mijung Park) 한국안광학회 2017 한국안광학회지 Vol.22 No.4

Purpose: The purpose of this study was to investigate the difference in the staining degree according to the type of ingredients contained in liquid eyeliners and cleaning effect of contact lenses. Methods: Three kinds of eyeliners containing red yellow, and black oxides of iron, and another three kinds of liquid eyeliner mixed with two or three iron oxides were diluted in saline. Then, their staining degree was observed by naked eyes and their transparency was measured, respectively, after 1 hr-immersion of somofilcon A, nesofilcon A, galyfilcon A, etafilcon A lenses in the diluted saline followed by cleaning. Results: The etafilcon A and somofilcon A lenses showed the highest staining when immersed in the eyeliner solution containing black oxide of iron. The staining degree of nesofilcon A lenses was highest when deposited with the eyeliner containing yellow oxide of iron. Galyfilcon A lenses showed the highest degree of staining in the eyeliner solution containing red oxide of iron, and a mixture of red and yellow oxides of iron. In the case of the nesofilcon A lenses immersed in the eyeliner solution containing yellow oxide of iron, the most staining remained after cleaned with a multipurpose solution. Conclusions: From this study, it is revealed that soft contact lenses are stained by liquid eyeliners, and the staining can not be returned to the baseline even when washed with multipurpose solution since irreversible staining may be induced depending on the ingredients contained in eyeliners. Therefore, it may be necessary to educate soft contact lens wearers about the cosmetics that cause staining in advance.

안구세안액의 사용 실태 및 이의 반복사용에 따른 투명소프트렌즈의 파라미터 변화

최현동(Hyun Dong Choi),김유정(Yoo Jung Kim),최수연(Suyeon Choi),신장철(Jang Cheol Shin),박미정(Mijung Park),김소라(So Ra Kim) 한국안광학회 2018 한국안광학회지 Vol.23 No.2

Purpose: This study investigated the perception and use of eyewash solution, and the changes in lens parameters when soft contact lenses (hereafter in soft lenses) were exposed to eyewash solution. Methods: The state of perception and use of eyewash solution was investigated using a questionnaire survey for those between teens and twenties. Four kinds of hydrogel lenses (2 etafilcon A lenses, 2 nelfilcon A lenses), and 5 silicone hydrogel lenses (2 senofilcon A lenses, 1 senofilcon C lens, 2 lotrafilcon B lenses) were selected for the study. Nine types of soft lenses were exposed to an eyewash solution for 1, 2, 4, and 8 hours based on time (30 seconds) spent for single use. In order to investigate the changes in lens parameters before and after exposure to an eyewash solution, total diameter, base curve, refractive power, visible light transmission, center thickness and water content were measured and compared. Results: Of the 186 respondents, 60 had experience using eyewash solution and 23 of them had experience wearing contact lenses after eyewash solution use. It was revealed that lenses were sometimes worn immediately after using the eyewash solution and eyewash solution was sometimes used during lens wear. The hydrogel lenses, etafilcon A and nelfilcon A, showed a statistically significant decrease in total diameter, base curve, center thickness and water content after exposure to eyewash solution however, the decrease of water content in etafilcon A lens, an ionic lens, was greater than it in nelfilcon A lens, a non-ionic lens. Lastly, the silicone hydrogel lenses senofilcon A, senofilcon C, and lotrafilcon B showed a significant decrease in water content after exposure to eyewash solution. There was also a decrease in total diameter depending on the characteristic of silicone hydrogel lenses. Conclusions: From these results, it was found that the stability of lens parameters was not maintained when the soft lenses were exposed to an eyewash solution for a certain period of time. In particular, hydrogel lenses were found to have greater changes than silicone hydrogel lenses. Therefore, it is believed that lens parameters will be affected if contact lenses wearer doesn’t follow the instruction for eyewash solution use or if an eyewash solution is used immediately before or in the middle of lens wear. Thus, repeated non-compliant use of eyewash solution may be a cause of changes in contact lens fit and tear metabolism.

펄스형 방전플라스마에서 발생하는 가시광선의 분광 ( 2 )

최운상(Woon Sang Choi),정수자(Soo Ja Jung),김용훈(Yong Hun Kim),장준규(Jun Kyu Jang),정정복(Jung Bok Jung),신장철(Jang Cheol Shin) 한국안광학회 2000 한국안광학회지 Vol.5 No.2

We investigated visible light radiated from Plasma Focus device by time - integrated analyzed method. Plasma focus is a device that translated from electric energy into visible light by electric discharge. Spectral analysis is using Monochromator ( focal length = 0.5 m ) . Time - integrated spectrum is analyzed with densitometer the film which developed a constant range of wavelength. The condition of visible emission was that the discharging voltage was 13 kV and the working gas were Argon and Helium.

스마트폰을 이용한 근거리 작업 후 20대 폭주부족안의 폭주 기능 변화

김소라(So Ra Kim),박시윤(Si Yoon Park),여혜정(Hye Jeong Yeo),김대연(Dae Yeon Kim),정지혜(Ji Hye Jeong),장효선(Hyo Seon Jang),신장철(Jang Cheol Shin),박미정(Mijung Park) 한국안광학회 2018 한국안광학회지 Vol.23 No.1

Purpose: In this paper, the change of convergence function of convergence insufficiency in their twenties after doing near work using a smartphone was investigated. Methods: The subjects in their twenties with corrected or uncorrected binocular visual acuity of 0.8 or better were examined their visual fuctions, and selected as 22 normal (27.60±2.20 years) and 11 convergence insufficiency (CI, 26.53±2.54 years) groups according to their convergence function. Then, near point of convergence (NPC), horizontal phoria, AC/A ratio, negative fusional vergence (NFV), positive fusional vergence (PFV) and subjective symptoms were measured both before and after watching a movie on smartphone for 30 minutes and further analyzed. Results: NPC tended to recede in normal group after using a smartphone; however, there was no large difference in CI. Far horizontal phoria was significantly shifted toward orthophoric position in both normal and CI groups, and significant difference of near horizontal phoria was only shown in CI group. Significant difference of AC/A ratio after watching a movie was only shown in normal subjects. There was no significant change in both near PFV and NFV of normal and CI groups. In the case of subjective symptoms, the eye related symptom score was significantly increased only in CI group. Subjective symptoms such as eye fatigue, discomfort, somnolence and burning were increased in both groups, and in CI group, blur, loss of concentration and slow down of reading speed were relatively increased compared with those in normal group. Conclusions: After using a smartphone, the convergence function and asthenopia may change according to whether the convergence function of subjects is normal or not, which can cause blur and loss of concentration. Therefore, the results suggest that working hour should be adjusted according to convergence function.