• Title/Summary/Keyword: ophthalmic test

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A Comparative Study on Test Methods for Ophthalmic Lens Coatings (안경렌즈 코팅의 평가 방법에 관한 비교 연구)

  • Yu, Dong-Sik;Moon, Byeong-Yeon;Ha, Jin-Wook
    • Journal of Korean Ophthalmic Optics Society
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    • v.11 no.1
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    • pp.7-15
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    • 2006
  • We have surveyed test methods for ophthalmic lens coatings and compared the coating quality of lenses supplied by manufactures. Plastic ophthalmic lenses are produced in increasingly larger volumes. However, their softness have need resistant coatings absolutely essential in most cases. Coating lenses are typically evaluated in physical and chemical properties through random selection from produced lenses. No international standard test methods for ophthalmic lenses exist for issues such as adhesion, abrasion resistance, hardness, chemical and hot water resistance with exception of transmittance. We have learned that there is a great deal of confusion regarding the methods employed in the various tests for ophthalmic coating lenses. For this reason, test methods for ophthalmic lens coatings are needed making all of international or domestic standards available.

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Study on Development of Infrared Retinoscope (적외선 검영기의 개발에 관한 연구)

  • Lee, Ik-Han;Sung, A-Young
    • Journal of Korean Ophthalmic Optics Society
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    • v.9 no.1
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    • pp.29-34
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    • 2004
  • The aim of this thesis research is to develop equipment measuring refractive state in order to measure the general ocular function using PC-based Foucault Test(Knife Edge Test). The Image of light generated from the reflection of incident light in retina thru Knife Edge Test was photographed using a CCD camera. The resulting image was then analyzed to measure the size of pupil by measuring the diameter of reflected image. The reflection state was judged from the orientation of reflected image and the degree of abnormal reflection was confirmed by measuring the size of second image of reflection. The aberration value was calculated from the magnitude of spherical aberration obtained by comparing the brightness of second reflected image appeared in the opposite direction to the reflected image.

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A Test of Visual Acuity to Kindergarten's Children (유치원 원아의 시력측정)

  • Kang, H.S.;Seo, Y.W.;Kang, I.S.
    • Journal of Korean Ophthalmic Optics Society
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    • v.1 no.1
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    • pp.53-56
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    • 1996
  • In testing visual acuity of kindergarten's children, single Landolt's ring in chart projector was used under proper intensity of illumination. According to the result of 218 eyes' test, 0.6 V.A. forms 8.5 % at the age of 3, 0.7 V.A. forms 84.7 % at the age of 4, and 1.0 V.A. forms 6.8 % at the age of 5. However, children's visual acuity has been gradually developed with their growth. None of emmetropia can be found through the test. All of the children have ametropic eyes.

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Diameter of the retinal blur circle in a artificial hypermetropia (인워적 원시에 따른 망막에서 착란원 크기)

  • Choi, Woon Sang;Kim, Yoon-Kyung;Oh, Heung Geun
    • Journal of Korean Ophthalmic Optics Society
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    • v.10 no.2
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    • pp.145-149
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    • 2005
  • In a artificial hypermetropia with the accommodative response, we investigated a diameter of blur circle as a function of test lens refractive power. In a schematic eye model of the hypermetropia, the second focal length along to accommodated power of the crystal lens are calculated as a function of test lens power and, also distance between the retina and exit pupil are calculated as a function of accommodated power. As these results are compared, the size of blur circle on the retina are obtained.

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Color Factor Analysis of in Farnsworth Test Panel D-15 (색각 검사용 Farnsworth Test Panel D-15의 칼라 인자 연구)

  • Kim, Yong-Geun;Park, Sang-An
    • Journal of Korean Ophthalmic Optics Society
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    • v.5 no.1
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    • pp.31-37
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    • 2000
  • In order to color analyze of in Farnsworth Test Panel D-15 using a Protan, Deutan and Tritan test, we introduced the CIE system so that measured the reflectance light spectrum intensity in the 380~780 nm wavelength regions. The color difference of Panel D-15 was depended on the intensity of reflectance ratio in the 400~450 nm, 500~600 nm and more than 650 nm wavelength regions. From the reflectance spectra, we obtained the tristimulus X, Y, Z values, the $L^*a^*b^*$ and $L^*ab$ values of the 3-Dimension CIELAB system in a complement plane and light-darkness axis, the $U^*V^*$ values and the x, y values of chromaticity coordinates.

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Study on Clinical Assessment and Reliability Analysis of Measurement with Diverse Autorefractors (검사기기에 따른 굴절력 측정의 임상적 평가 및 신뢰도에 관한 연구)

  • Kim, Tae-Hun;Kwon, Young-Seok;Ye, Ki-Hun;Sung, A-Young
    • Journal of Korean Ophthalmic Optics Society
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    • v.11 no.4
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    • pp.293-298
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    • 2006
  • For this study, Clinical evaluation of the diverse Autorefractors was performed to examine validity and repeatability compared with subjective refraction. Measurements of refractive error were performed on 212 eyes of 106 subjects subjectivly noncycloplegic. Intersession repeatability of the Autorefractors were also assessed on all 106 subjects together with intersession repeatability on 7 to 14 days intervals. Spherical powers of subjective refraction and autorefractions by Autorefractors were analyzed by paired T-test.

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Clinical Study on Accommodation Using Subjective Test (자각적 검사를 이용한 조절력에 관한 임상적 연구)

  • Jung, Mi-Boon;Lee, Ki-Seok;Kim, Tae-Hun;Sung, A-Young
    • Journal of Korean Ophthalmic Optics Society
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    • v.11 no.2
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    • pp.137-141
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    • 2006
  • We have studied on the accommodation of people for 10~60ages at Honam residents and compared with the already known accommodation from age. Using Push-up method, we obtained results that average accommodation of each cases were 10ages 9.88D, 20ages 8.65D, 30ages 6.92D, 40ages 5.05D, 50ages 4.29D, 60ages 4.63D. Accommodation was on the decreased in increasing the ages but showed the very high accommodation in 50, 60ages on this study. We judged we should consider a accommodation research of other districts and near addition test.

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Analysis of far & near distance of lateral phoria by various testing methods (검사 방법에 따른 원·근거리 수평사위의 분석)

  • Hong, Dong-Gyun;Jung, Han-Sub;Park, Sang-An
    • Journal of Korean Ophthalmic Optics Society
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    • v.9 no.2
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    • pp.423-430
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    • 2004
  • This Study on three different methods which are Von Graefe test, Maddox Rod test and Howell card test of measuring far and near lateral phoria investigated. It reviewed that 420 subjects aged from 15 to 35 years old. The result were as follows; 1. Using Von Graefe lateral phoria measurement, they were measured 6% for orthophoria, 62% for exophoria, 32% for esophoria at far distance. 2. Using Von Graefe lateral phoria measurement, they were measured 2% for orthophoria, 74% for exophoria, 24% for esophoria at near distance. 3. Using Maddox Rod lateral phoria measurement, they 59% for exophoria, 37% for esophoria at far distance. 4. Using Maddox Rod lateral phoria measurement, they 67% for exophoria, 30% for esophoria at near distance. 5. Using Howell card lateral phoria measurement, they 60% for exophoria, 32% for esophoria at far distance. 6. Using Howell card lateral phoria measurement, they 69% for exophoria, 27% for esophoria at near distance.

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The Study of Accommodation Assessment in Binocular Functional Test (양안시검사의 조절평가 연구)

  • Cho, Young-Rae;Park, Hyun-Ju
    • Journal of Korean Ophthalmic Optics Society
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    • v.12 no.1
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    • pp.61-67
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    • 2007
  • The binocular functional test was performed in test of both accommodation and convergence. The balance of accommodation and convergence was important. Objects were 100 adults in 18-36 years old ages. The used apparatus was vision tester(Shinnippon VT10)and visual chart(Shinnippon CT30). Accommodative lag test by fused cross cylinder were that in case of high 39.0%, in case of low 14.0%. Negative relative accommodation were that in case of high 23.0%, in case of low 38.0%. Positive relative accommodation were that in case of high 29.0%, in case of low 23.0%. In 18% were case of low accommodation.

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The Confusing Color line of the Color deficiency in Panel D-15 using CIELab Color Space (CIELab 표색계를 이용한 Panel D-15의 색각이상 혼돈색 line 연구)

  • Park, Sang-An;Kim, YongGeun
    • Journal of Korean Ophthalmic Optics Society
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    • v.6 no.1
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    • pp.139-144
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    • 2001
  • In order to analyze of the color perception Farnsworth Test Panel D-15 in the CIELab color space coordinates, it was measured by the reflectance spectrum of the 380~780nm wavelength regions. The Test Panel D-15 was situated in the near origin point of higher the saturation in CIELab coordinates (a, b). Normal person perceived to the similar color for the color of small color difference, and color deficiency person depended on the confusing color line and the neutral point unconcerned with the color difference. In case of Ptotanopia, Deutrnopia, r-g defect, y-b defect with the color deficiency, the neutral points position (a,b) were each (2.12,1.02), (4.25,2.05), (2.51,0.25), (1.20,-1.10).

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