• Proceedings of the Korean Society of Computer Information Conference
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• 2011.01a
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• pp.321-322
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• 2011

이 논문에서는 최근 각광 받는 의료 융합 IT를 이용한 모바일 콘텐츠로써 안과 병원을 찾지 않고도 스마트폰을 이용하여 건강관리 서비스를 제공하는 스마트폰 앱의 개발을 다룬다. 개발하려는 서비스를 통하여, 자신의 눈 상태를 체크하고 예방할 수 있으며, 주기적인 시력검사 및 색맹/색약, 난시/근시 등의 질환을 검사하고 동체시력운동, 원근법 눈운동, 눈체조 등 눈이 좋아지는 운동과 눈이 좋아지는 그림을 통하여 눈의 피로를 해소하고자 한다. 또한 검사 결과에 따른 개인별 검사 관리표, 시력 예방 관리 그래프 제공하여 자가진단 및 시력 관리를 할 수 있도록 한다. 이러한 서비스는 시간과 장소에 구애 받지 않고 사용자에게 제공 하도록 스마트폰 앱으로 개발한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.2
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• pp.741-749
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• 2010

The aim of this study was to survey the presenting visual acuity (VA) and satisfaction of VA tests in health checkups and to suggest ways in which eye care can be improved. VA data were obtained from the results of the health checkups for Korean adults in 2002-2007. Satisfaction questionnaires were administered via direct interview with 173 participants who had health checkups. The prevalence of VA 0.5-1.4 was 76.24%. Women had a higher prevalence than men below VA 0.9 and men had a higher prevalence than women above VA 1.0. The change in VA with age had a tendency to decrease after forties. Findings for satisfaction of VA tests on health checkups showed a level of neutral agreement. In order to enhance satisfaction, it is important that vision testing should provide examinees with referral criterion and follow-up VA results. It is also necessary to have comprehensive eye examination and utilize optometric instruments and professional examiners.

• Journal of Korean Ophthalmic Optics Society
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• v.20 no.2
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• pp.187-193
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• 2015

Purpose: This study was aimed to investigate effects of increased breath alcohol concentration (BrAC) which is the standard measurement of alcohol consumption in sobriety test under current laws on visual acuity and values of objective refraction. Methods: For twenty three males in 20s (average age $21.17{\pm}2.19$ years, body mass index (BMI) $22.09{\pm}2.16$) were selected. Distance and near visual test was performed at BrAC of 0%, 0.05% and 0.08%, and objective refraction with open-field auto-refractometer was also performed at different BrAC. Results: As breath alcohol concentration is increased, distance visual acuity was decreased, which was statistically significant, but near visual acuity was not changed. Also, values of objective refraction tended to be increased towards minus as breath alcohol concentration is increased. Conclusions: As breath alcohol concentration is increased, corrected visual acuity is decreased and refractive power is towards minus, it is necessary that visual acuity test and refraction measurement should be conducted under sober condition.

• Journal of Korean Ophthalmic Optics Society
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• v.12 no.4
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• pp.95-99
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• 2007

This study performed apreliminary test with male high school students in Gwangju metropolitan city in order to determine visual function information of high school students. For the items in this preliminary test, there were inquiry, test for long distance unaided visual acuity, pinhole visual acuity test, colour vision test, cover test and stereo test. Most complaint related to eye was about blurred vision (28.4%) and over 90% of subjects had one or more, and among them, over 50% appealed two or more complaints. 76.1% of all subjects showed less than 0.7 in unaided distance visual acuity. In pinhole visual acuity test, 98% had an improved unaided pinhole visual acuity and most of them experienced an improvement and 2% had no change or dropped. The students with normal stereoscopic vision test were 85.6% and the students under normal range were 14.4%. In colour vision test, 7.9% of them were protanomaly and deuteranomaly and none of them had trichromasy and total color blindness. In cover test, it showed 30.2% of orthophoria, 8.2% of esophoria and 61.5% of exophoria, and none of them had strabismus.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.893-894
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• 2009

인간의 시력 측정을 위한 방법은 검사자를 필요로 하는 표준 시표 제작을 위한 수동적인 방법이 대부분으로 컴퓨터 기반의 자가 검사가 가능한 시력 측정 시스템 개발은 미흡한 설정이다. 따라서 본 논문에서는 2006년에 국제규격(ISO 8596)에 따라 정의된 KS 표준 시표(한국 산업규격 P ISO 8596)를 참조 한 컴퓨터 기반의 자가 시력 측정 시스템을 구현한다. 구현된 시스템은 란돌프 고리(Landolt's rings) 시표를 이용하여 측정거리에 제약이 없이 검사자의 주관적 판단이 배제된 시력 측정이 가능하며 효율적 사용자 인터페이스를 제공한다. 구현된 자가 시력 측정 시스템의 성능은 시력 측정자 100명을 대상으로 시력표에 의한 측정치와 비교 실험한 결과 시력 등급을 기준으로 87%의 일치도를 보였다.

• Journal of Broadcast Engineering
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• v.20 no.6
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• pp.901-911
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• 2015

Many studies tried to develop a 3D display based stereo test as a substitute for the conventional stereo test. Although many 3D monitor based stereo tests have various advantages over the conventional stereo tests with printed stimuli, they have a crucial limitation in manipulating disparity. The least value for disparity manipulation is one pixel, which is too big to screen the normal stereo acuity in pc environment with a short viewing distance. In this explorative study, a Gabor image was employed as a test stimulus, because its position can be manipulated by changing its phase information, which allows sub-pixel manipulation for disparity. Instead of employing the methods of the conventional stereo tests where measurement was made only once for each of a wide range of disparity values, 10 replications were administrated for each of 6 disparity levels. The results from the test using Gabor images were compared with those using random dot stimulus because the latter stimulus was exactly the same as that of the conventional stereo test. The correlation coefficient between two tests was found to be moderate. After one month later, the whole test was repeated in the same settings. The correlation coefficient between test and retest results from Gabor images was found to be as high as that from a random dot stimulus, implying high test-retest reliability. These results suggest that a Gabor stimulus could be used as a test stimulus for the valid and reliable stereo test, even in the limited condition, such as 3D environment with a short viewing distance and a condition for evaluating the stereo acuity very precisely.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.1082-1085
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• 2010

인간의 시력 측정을 위한 방법은 표준 시표(Optotype)에 따라 제작된 시표를 이용하여 검사자가 피검자를 측정하여 기록하는 방법이 대부분으로 컴퓨터 기반의 자가 검사가 가능한 시력 측정 시스템은 미흡한 실정이다. 또한 측정된 시력의 자동 데이터베이스에 의한 시력 관리 기능도 제공되지 않고 있다. 따라서 본 논문에서는 2006년에 국제규격(ISO 8596)에 따라 정의된 KS 표준 시표(한국 산업규격 P ISO 8596)와 시력 측정 방법을 참조하여 자가 시력 측정과 측정된 시력 데이터의 데이터베이스 관리가 가능한 컴퓨터 기반의 측정 시스템을 구현한다. 구현된 시스템은 피실험자를 대상으로 실제 시력표에 의한 시력 측정 방법과 비교 실험한 결과, 시력 측정에 있어서 객관성과 편의성을 보장하며 측정된 시력에 있어서도 데이터 관리의 유효성과 정확성을 보였다.

• Journal of Korean Ophthalmic Optics Society
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• v.19 no.1
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• pp.17-22
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• 2014

Purpose: We aimed to evaluate reliability of eye exam for visual acuity as a function of distance. Methods: There were 39 patients (78 eyes) who had visual acuity 1.0 or more at 5 meters. We measured refractive power of patients at each distances, 5 meters, 4 meters and 3 meters. Automatic chart (LCD-700, Hyeseong Optic. Co., Korea) used for visual acuity, skiascope (Beta 200, Heine, Germany) and auto refractometer (RK-5, Canon, Japan) used as for objective refraction. Accommodation was examined by minus lens addition methods, and Accommodative lag was examined by grid chart for reading distance. Results: Being compared to 3 meter test, Amount of corrected spherical refractive power decreased by $0.10{\pm}0.38$ D, astigmatism decreased by $0.05{\pm}0.10$ D, and axis of astigmatism rotated toward to temporal by $2.64{\pm}18.75$ degrees for right eyes, by $11.43{\pm}48.55$ degrees for left eyes in case of 5 meter test. Changes of corrected refraction and astigmatism were slightly correlated (r=-0.31, r=-0.29). Conclusions: Because corrected refraction power and amount of astigmatism decreased and axis of astigmatism tends to turn the temporal direction according to exam distance, examination distance of visual acuity should improved as to 5 meters.

• Journal of Korean Ophthalmic Optics Society
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• v.10 no.2
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• pp.111-118
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• 2005

The optotypes widely used as a necessity in the course of optometry are the world authorized versions which contain items such as the Landolt's rings, Snellen's chart and also Arabian numbers, Korean letters, Pictures and so on. In Korea, the Hahn-chun-suk test chart has been In use generally alolng with Chung-san test chart and Jin-yong-han test chart also in use on the wall. But these sort of test charts hung on the wall have some problems such as the difference in test results owing to the rate of illumination and so a more accurate method is required. To solve the problem of inaccuracy in optometry, the projected type of charts with digital instrument such as the beam projector has been developed lately. This chart projector with consistent high resolution and the ability to provide various charts can help eye examiner perform effective examination and thus is looked positively upon as the automated total optometry system. So in this study our purpose is to examine the accuracy of the projected chart. It was done by comparing it with the frequently used test chart. The results of experiment are as follow. When the projected chart was used, cases that subject read charts one step higher were 10%, two step higher 2% than perfectly corrected vision. When Han-chun-suk test chart was used, cases that subject read charts one step higher were 12%, and two step higher were 4%.

• Journal of Korean Ophthalmic Optics Society
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• v.18 no.2
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• pp.173-178
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• 2013

Purpose: This study is to predict refractive errors according to uncorrected visual acuity using uncorrected visual acuity of the first glasses wearers. Methods: For 886 children who visited an ophthalmic clinic, subjective refraction was carried out with maintain refraction (MR) and cycloplegic refraction (CR), and objective refraction was carried out using auto-refractometer. Uncorrected visual acuity and corrected visual acuity were tested using on a trial lens and a Han's visual acuity chart. Results: In correlation between with the uncorrected visual acuity and refractive the myopia was the highest (r=0.774) and followed by hyperopia (r=0.670), simple astigmatism (r=0.623), simple with-the-rule astigmatism (r=0.604)and simple against-the-rule astigmatism (r=0.508). Conclusions: There were differences in the predictions between uncorrected visual acuity and refractive error according to the types of refractive error and astigmatism.