• Journal of Korean Ophthalmic Optics Society
• /
• v.14 no.2
• /
• pp.1-8
• /
• 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.

• Journal of Korean Ophthalmic Optics Society
• /
• v.15 no.3
• /
• pp.257-262
• /
• 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.

• Journal of Korean Ophthalmic Optics Society
• /
• v.5 no.2
• /
• pp.55-58
• /
• 2000

Spectacle diopter of age related changes during 5 years examined 360 eyes(male 79, women 81) who visited optical shop every year. Increasing refractive error of Myopia obviously appeared in young generation which term was elementary school, and then middle and high school. In this study, we concluded that term of correction spectacles should be 4 months in elementary school, 6 months in middle school, and every year in high school.

• Journal of Korean Ophthalmic Optics Society
• /
• v.18 no.4
• /
• pp.399-404
• /
• 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.

• Journal of Korean Ophthalmic Optics Society
• /
• v.14 no.3
• /
• pp.65-73
• /
• 2009

Purpose: This study was conducted to investigate the changes in distance refractive power and reading addition that occur after wearing corrective glasses for prebyopia. Methods: The subjects aged 42 to 75 years who had no ophthalmologic diseases and did not undergo cataract or retina surgery, had a corrected visual acuity of 20/20 and did not have a previous history of wearing corrective glasses for presbyopia. These subjects were divided into 3 groups: the control, reading spectacles and multifocals wearing group and they were measured for distance refractive power and reading addition at their visit. The maximum follow-up period was 73 months. Results: As for distance refractive power, the power tends to shift to hyperopia depending on age (r=0.486, p<.001) and 50.0% of the subjects increased plus power during this study period. Plus power Increments per year in distance refractive power in the reading spectacle wearing group were significantly different with control and multifocals wearing group (p<.05). On the other hand, the multifocals wearing group's increments were not different with control. Increments in reading addition were also increased in the reading spectacles group than in the control and multifocals wearing groups (p<.05). Conclusions: The age related hyperopic shift could be occurred in the elderly people, routine refraction is mandatory. And reading spectacles could induce an age related hyperopic shift and the additional need for reading addition that the prescription of multifocals may reduce changes in distance refractive power and reading addition.

• Journal of Korean Ophthalmic Optics Society
• /
• v.5 no.2
• /
• pp.43-47
• /
• 2000

The purpose of this study is evaluate for effect quality eye care to the aged population of rural community. This study investigated one of important factors in dispensing distance pupillary distance. measured reading pupillary distance, calculated reading pupillary distance into age group and sex. I measured pupillary distance and near inter pupillary distance with corneal reflection pupillometer(shin Nippon PD-82) The objects are male and female living rural community at least 60 years old. The mean pupillary distance for distance of male and female were 63.52 mm, 61.24 mm, respectively. The mean measured reading pupillary distance of male and female were 60.12 mm, 58.08 mm, respectively. Gradient and difference between male and female were same with mean pupillary distance for distance. The result of comparison the mean difference of the mean measured reading pupillary distance and the calculated reading pupillary distance into the age group and sex. This result of changes of addition, as the age is older, the mean addition is greater than youth. I'd like to compare changes of these factors influenced by environmental factors, however I couldn't see about these. So I couldn't considered their relationship and some possible problems of wearing commercial reading glass.

• The Bulletin of The Korean Astronomical Society
• /
• v.33 no.1
• /
• pp.44.1-44.1
• /
• 2008

• Bulletin of the Korean Space Science Society
• /
• 2008.04a
• /
• pp.27.2-27.2
• /
• 2008

• The Bulletin of The Korean Astronomical Society
• /
• v.33 no.2
• /
• pp.48.2-48.2
• /
• 2008

• Journal of Korean Ophthalmic Optics Society
• /
• v.7 no.2
• /
• pp.149-154
• /
• 2002

This study is examined the difference between binocular spherical diopter and astigmatism diopter, spherical diopter, astigmatism diopter, and axis of astigmatism by sex and age with reference to the prescription of refraction for a total of 257 persons, 134 persons (male:78, female: 56)of teen-age and 123 persons of twenty-age who visit optical shop. Spherical correction diopter is mainly distributed to 280 eyes between -0.25D and -4.00D. And in astigmatism correction, for right astigmatism, 48 eyes(49.48%) are prescribed astigmatism diopter for a range of C-0.25~C-0.50D, 29 eyes(29.89%) has C-0.75~C-1.00D, 65 eyes(67.01%) has with the rule astigmatism. For left astigmatism, 43 eyes(42.57%) are prescribed astigmatism diopter of C-0.25~C-0.50D and 37 eyes(36.63%) has C-0.75C~1.00D, 73 eyes(72.27%) are shown with the rule astigmatism. And also each 108 persons(47.16%) and 28 persons(25.00%) are shown no difference between binocular spherical correction diopter and binocular astigmatism correction diopter, 94 eyes(39.49%) of teen-age and 104 eyes(42.27%) of twenty-age, male 119 eyes(41.90%) and female 79 eyes(34.34%) need correcting astigmatism. In pupillary distance, 165 persons mostly have 59~64mm.