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The Understanding of Determination of Horizontal Centration Point of Single-vision Reading Glasses (단초점 근용 안경의 수평방향 설계점 결정에 대한 이해)

Kim, Min Ho;Kim, Hyun-Il
- Journal of Korean Ophthalmic Optics Society
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- v.14 no.2
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- pp.1-8
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- 2009
Purpose: The purpose of this study is to compare degrees of asthenopia in after wearing of dispensed reading glasses with different criterion of P.D. Methods: The person who has minus near correction power (distance correction value (-)) is compared to the degree of asthenopia by wearing of dispensed reading glasses with near P.D(-B) and distance P.D. The person who has plus near correction power is compared to degree of asthenopia by wearing of dispensed reading glasses with near P.D-B, distance P.D, near P.D-A. The "Near-P.D-A" means reduced optical centre distance of reading glasses of positive correction value at which the same effect of prism B.O through near visual point in distance glasses exist at near visual point in reading glasses. Results: When near correction value is (-), dispensed reading glasses with distance P.D have caused less asthenopia than dispensed glasses with near P.D-B. When the near correction value is (+), we cannot confirm that which P.D is more useful for reading glasses. As a result of this study, dispensed reading glasses with near P.D-A have caused less asthenopia than another criterion of P.D. Conclusion: The effect of prism B.I through a near visual point in distance glasses ((-) correction value) reduce convergence demand. Therefore (-) correction value-reading glasses support convergence in near vision, because the effect of prism B.I of reading glasses is smaller than that of distance glasses. When the near correction value is (+), centration points can be determined by one of near P.D-A, near P.D-B, distance P.D.
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미국기행

원용택
- KOREAN POULTRY JOURNAL
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- v.5 no.8 s.46
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- pp.77-79
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- 1973
다음은 지난 5월 7일 사료협회 알선과 미곡물협회 초청으로 미국의 축산업계를 돌아보고 귀국한 대한사료 원용택 부장의 미국 기행을 독자들을 위하여 흥미 있게 게재하기로 했다. 지난호 오세정 교수의 미국축산업계를 돌아보고에 이어 이번호부터 약 5개월에 걸쳐 미국의 이모저모를 게재할 예정이다.
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Development of a Calculating Program for the Prism Power Influencing to Binocular Vision according to Shift of Binocular Visual Points in the Distance Vision Spectacles (원용안경의 양안 주시점 이동에 따른 양안시에 미치는 프리즘 굴절력 산출 프로그램 개발)

Lee, Dong-Hee
- Journal of Korean Ophthalmic Optics Society
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- v.15 no.3
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- pp.257-262
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- 2010
Purpose: Developing a calculating program for the prism power which influenced the binocular vision according to shifts of binocular visual points in the distance vision spectacles. Methods: By using the Delphi 6.0 programming language, we developed a calculating program of the relative binocular prism power according to the movements of binocular visual points in the distance vision spectacles, which was calculated by dragging the mouse along the traces of binocular visual points on the computer window. Results: We developed a calculating program for the relative binocular prism power according to the movements of binocular visual points in the distance vision spectacles. The user of the program could confirm the trace of visual points by allowing them to display the trace of binocular visual points on the computer screen with a mouse button. An application on confirming the variation of prism power by graphs in the program also allowed the user to use the program more conveniently. Conclusions: By using the developed program, the user could easily calculate the relative binocular prism power according to shifts of binocular visual points in the distance vision spectacles. We also found that the developed program helped the user to receive a lot of assistance in analyzing the asthenopia.
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The Study on Change of Refractive error and Addition in Progressive Eyeglasses Lens Wearers (누진렌즈안경 착용자의 가입도와 굴절이상 변화에 대한 연구)

Joo, Seok-Hee;Shim, Moon-Sik;Shim, Jun-Beom
- Journal of Korean Ophthalmic Optics Society
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- v.18 no.4
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- pp.399-404
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- 2013
Purpose: This study was to analyse the changes of refractive error and addition in progressive eyeglasses lens wearers. Methods: Data of 244 subjects who have been prescribed progressive eyeglasses lenses were used for analysis. The range of age was between 43~69 old years and they visited the optical shop in Gwangju metropolitan city from 2003 to 2013. According to the refractive state and age, The changes of refractive error and addition was analysed respectively. Results: The changes of distance refractive power by refractive error was showed +0.10 D in emmetropia, +0.07 D in myopia, +0.23 D in hyperopia (p=0.000). The change of addition was showed +0.22 D in emmetropia, +0.29 D in myopia, +0.17 D in hyperopia (p=0.000). The changes of distance power and addition by age was +0.08 D distance refractive power, +0.30 D addition in the group of 40~49 old years, +0.17 D distance refractive power, +0.20 D addition in the group of 50~59 old years and +0.15 D distance refractive power, +0.14 D addition in the group of 60~69 old years (p=0.046, p=0.006). Conclusions: The changes of refractive error and addition of progressive eyeglasses lens wearers in all refractive state and age were gradual increase in the direction (+) diopter.
https://doi.org/10.14479/jkoos.2013.18.4.399 인용 PDF KSCI