• Journal of the Korea Convergence Society
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• v.8 no.12
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• pp.391-395
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• 2017

In this research, we conducted a questionnaire survey of contents necessary for eyeglass dispensing & fitting fee and characterization solution of eyeglass dispensing & fitting fee. From August 1, 2016 to September 30, questionnaires were set up for 202 spectators of Seoul and Gyeonggi area, questionnaire survey was conducted online and offline. Statistical processing of all data was performed using Origin Pro 8.5. 92.1% (186 people) and 93.1% (188 people) were positively evaluating the necessity of introduction for the necessity of introducing eyeglass dispensing & fitting fee, respectively. The result suggested that it is necessary to establish the position of the optician as a medical service expert by providing a more stable policy through analysis of overseas cases of eyeglass dispensing & fitting fee.

• Journal of the Korea Convergence Society
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• v.11 no.8
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• pp.317-321
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• 2020

This study researched the correlation between myopic refractive errors and intraocular pressure. The study population comprised 39 adults(17 of males, 22 of females). We measured the intraocular pressure using a Non-Contact Tonometer(NCT) and the correlation between myopic refractive errors was analyzed by dividing into three groups: mild, moderate, high myopia. The gender of subjects showed no statistically difference between the intraocular pressure and refractive errors, but as the refractive errors increased, the intraocular pressure incereased, which showed a statistically significant difference. In addition, the higher intraocular pressure in moderate and high myopia than mild myopia can cause glaucoma, that can develop at a young age. it is need to sufficient recognition and understanding correlation between intraocular pressure and myopic refractive errors in the middle-aged high myopia.

• Journal of Korean Ophthalmic Optics Society
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• v.17 no.2
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• pp.107-117
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• 2012

Purpose: We study the eyeglasses consumer's purchasing decision, brand equity, purchase satisfaction and word of mouth. Methods: For two month, from October to December, 437 questionnaires distributed through eyeglasses shops. Sampling was performed using a convenience sampling, participants in the survey-based selflegislation (self-adminstration method) were to answer. Results: It was found that demographic characteristics - gender, age, education, income - acts as parameters representing difference of purchase decision, brand equity and word of mouth. Conclusions: Consumer's demographic characteristics such as gender, age, education, income serve as parameters that represents the differences. Purchase satisfaction by age is statistically significant. Word of mouth is also classified according to their income level is statistically significant.

• Journal of Korean Ophthalmic Optics Society
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• v.17 no.2
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• pp.119-126
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• 2012

Purpose: To study changes in coating and lens materials after chemically etched different polymer based glass lenses in short-term and ambient condition using hydrofluoric acid. Methods: Vinyl ester polymer (Lens A) and thiourethane polymer (Lens B), both dyed in gray 70%, were etched in hydrofluoric acid solution for 5, 10, or 15 min. The mechanical properties, degrees of damages in hard coating, anti-reflection coating, and other coatings, rates of refractive index and light transmission of both polymer types were evaluated. Results: Rates of refractive index of both lens types were not changed significantly after chemical etching. However, anti-reflection coatings and hard coatings were removed and lens surfaces were damaged. As a results, UV light transmission of lenses increased and mechanical properties decreased. Chemical etching notably changed various properties of thiourethane polymer materials. Conclusions: Depending on types of polymer materials, chemical reactions by hydrofluoric acid were dissimilar. Thus, various properties of les materials were altered differently.

• Journal of Korean Ophthalmic Optics Society
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• v.16 no.1
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• pp.61-64
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• 2011

Purpose: The purpose of this study was to design the finite model eye with GRIN lens similar to actual eye, which considered the effect of iris eccentricity on eyes. Methods: By using the finite model eye with Radial GRIN and Spherical GRIN, which were designed previously, the location of iris was eccentrically located by 0.5 mm in the direction of nose to show the same eye as actual one. For ray trace and design, Code V program of Optical Research Associates (ORA) was adopted. Results: Designed model eye was compared to actual eye depending on iris eccentricity and the model eye which showed reduced value was corrected according to actual eye to design the finite model eye. Conclusions: Ocular optical systems considered the point that iris was a rotational asymmetry and designed the finite model eye with GRIN lens, which was similar to actual eye, by considering the effect of iris eccentricity on eye.

• Journal of Korean Ophthalmic Optics Society
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• v.17 no.2
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• pp.195-202
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• 2012

Purpose: We intended to study effects of wearing the progressive lenses on legibility of Korean letters under the VDT circumstance. Methods: Fifty subjects wearing the progressive lenses and the single focus lenses were asked to find designated characters on web-pages under the VDT circumstance. We measured times for subjects to read the web-pages and numbers of missed characters, considering them as standards of legibility, and compare results of the progressive lenses with those of the single focus lenses by variables of the size and legibility of letters and the width of web-pages. Results: In case of the progressive lenses, all the times to read the web-pages and some of the numbers of missed characters increased with statistical significance. Smaller the character size, lower the legibility of character itself, and wider the width of web-page, the legibility tended to be seriously lowered by the progressive lenses. Conclusions: It is presumed that the intermediate part of progressive lenses with narrow visual field lowers the legibility of Korean letters under the VDT circumstance.

• Journal of Korean Ophthalmic Optics Society
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• v.18 no.2
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• pp.93-99
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• 2013

Purpose: The aim of this study was to develop a dry eye test method using a paper based microfluidic device that improves inaccuracy caused by using one of current point-of-care dry eye tests such as Shirmer's. Methods: Wax printed hydrophilic chromatography papers were dyed with anthocyanin extracts to detect colorimetric display of liquid samples with varying pH. Fluid distribution rates were measured using artificial tears and human tears directly from 32 subjects. Results: With Shirmer's, fluid distribution rates with small amount of samples (less than $0.5{\mu}l$) were not displayed. However, with paper based microfluidic device, fluid imbibition distances over time were clearly showed. Also clinical results of dry eye from newly developed paper based microfluidic device showed correlation with the results from tear break up time tests. Conclusions: The newly developed paper based microfluidic devices were easy to use and exhibited more accurate clinical results than current dry eye point of care tests such as Shirmer's.

• Journal of Korean Ophthalmic Optics Society
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• v.14 no.4
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• pp.59-63
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• 2009

Purpose: This study was designed to compare the relative accommodation, the accommodative facility, and the addition whose 40's initial presbyopia divided into five occupations (driver, official worker, housewife, field worker, teacher). Methods: We measured the values of near point convergence (NPC), positive relative accommodation (PRA), negative relative accommodation (NRA), accommodative facility, and addition. Results: Official worker group had lower PRA, higher NRA, and lower accommodative facility compared with them of the other groups. The average of addition was as follows: official worker > driver > field worker > housewife > teacher. Conclusions: Because the difference of working environment based on occupation affects the accommodative functions and addition, it is important to consider the patient's occupation when opticians measure the addition for near vision of initial presbyopia.

• Journal of Korean Ophthalmic Optics Society
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• v.14 no.4
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• pp.27-31
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• 2009

Purpose: The purpose of this study was to document the importance of work capability and the educational needs for optometric duty. Methods: Questionnaires were distributed to 813 optometrists and 89 full-time faculties on nation wide in July, 2008. Results: Statistical analysis showed that high mean of 3.53, maximum of 4, for the importance of work capability, and 3.46 for the educational needs as for the total optometric duty. Especially, optometric dispensing was the highest on the importance of work capability and the educational needs, where as medical ethics and optometric jurisprudence and business management was the lowest. Conclusions: Both optometrists and full-time faculties agreed to the importance of work capability and the educational needs, and therefore it should be reflected in optometric education program.

• Journal of Korean Ophthalmic Optics Society
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• v.15 no.4
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• pp.373-379
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• 2010

Purpose: The purpose of this study was to investigate the effect of vision training using MYSTERY CIRCLE system on patients with exophoria and intermittent extropia. Mehtods: The vision training observation group consists of 26 clients who had exophoria (n=18) and intermittent extropia (n=8) without opthalmic diseases or vertical phoria. Our clients took each vision training once a week for eight weeks and were investigated for the symptoms changes of binocular vision. Results: According to the results, MISTERY CIRCLE vision training methods improved the binocular vision function and sensation symptoms. For Worth 4 Dot test, Titmus test and red lenses showed fusion rate changes. Conclusions: The study proved that MISTERY CIRCLE vision training system for patients with binocular vision was effective for the improvement of the binocular vision symptoms of these patients.