• Journal of Korean Ophthalmic Optics Society
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• v.5 no.2
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• pp.55-58
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• 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
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• v.11 no.1
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• pp.49-53
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• 2006

Acrylate -PDMS(Polydimethylsiloxane)-Urethane Prepolymer is synthesized through treating diisocynate, HEMA(2-hydroxyethylmethacrylate) and bis(hydroxyalkyl)terminated Poly(dimethylsiloxane) having high oxygen permeability under the DBTDL(Dibutylitin dilaurate) catalyst. Modification of HEMA on bis(hydroxyalkyl)terminated Poly(dimethylsiloxane) is to be able to polymerize with other contact lens materials. And modification of urethane on bis(hydroxyalkyl)terminated Poly(dimethylsiloxane) is to increase elastic property and oxygen transmissibility. This material is analyzed by FT-IR and also will be used to make hydrogel contact lens.

• Journal of Korean Ophthalmic Optics Society
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• v.9 no.2
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• pp.313-322
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• 2004

Glasses are to be classified in organic glasses and inorganic glasses. Generally, we just call glasses instead of calling inorganic glasses and call synthetic resin or plastic instead of calling organic glasses. One of the ophthalmic plastic glasses develops into polycarbonate resin in organic glasses. Recently, polycarbonate resin is widely known because it has larger index and impact than plastic lens. Ours study analyzed about polycarbonate resin in ophthalmic substance.

• Journal of Korean Ophthalmic Optics Society
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• v.1 no.1
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• pp.65-72
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• 1996

The general property of plastic ophthalmic lens has been reviewed by the optical property and polymer structure. A PMMA which is synthesized by the polymerization of monomers of two or more kinds is termed a copolymer, and the main chain composes a skeleton of molecular structure in the polymer. Refraction index of polymer was governed mainly by the polarization of molecular and was followed to increase it conspicuously as Cl, Br, and Iodine was substitude to hydrogen. Thermal dependence of refraction index of polymer show that the higher distinctive characteristic than glass material.

• Journal of Korean Ophthalmic Optics Society
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• v.8 no.1
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• pp.73-84
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• 2003

This paper reviews the current status of ophthalmic education and legislation worldwide. The impact of the profession of optometry in providing eye and vision care in different regions of the world and strategic directions for optometry in Korea are discussed. The role of the World Council of Optometry in advancing the access and delivery of eye and Vision care is emphasized.

• Journal of Korean Ophthalmic Optics Society
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• v.2 no.1
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• pp.45-54
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• 1997

We chose four typas of Huygenian, Ramsden, Kellner, Erfle, among the eyepieces frequently used for optical instruments. Then we calculatde their optical properties and investigated characters of each type by comparing them.

• Journal of Korean Ophthalmic Optics Society
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• v.11 no.3
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• pp.275-280
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• 2006

For this study, we analysed the difference of values between noncycloplegic and cycloplegic autorefraction in primary school children. We classified the elementary school one, two, three grade (8~10age) 79children(158eyes) who did not have strabismus or amblyopia. They were examined by using the Autorefractor in domestic market before and after cycloplegic. Discrepancies beyond 0.50D in spherical and cylindrical power and 20 degree in cylindrical axis were regarded as significant. The percentages of discrepancy were greater in spherical power between noncydoplegic and cycloplegic autorefraction(p<0.05). The percentages of discrepancy were not greater in cylindrical power between noncycloplegic and cycloplegic autorefraction. The percentages of discrepancy were greater in cylindrical axis between noncydoplegic and cycloplegic autorefraction(p<0.05). In conclusion, for the primary school children who did not wear glasses, the prediction table of this study will be helpful to reduce the test error in visual acuity and refractive error tests.

• Journal of Korean Ophthalmic Optics Society
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• v.4 no.2
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• pp.81-86
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• 1999

Human corneal epithelial cells and mouse fibroblast L929 cells were grown to 60-70% confluency in 96 well plates. 24 hours after the well plates are inoculated, the medium on the test plates is aspirated and replaced with an extract supplemented medium prepared from the materials to be tested. The contact lenses manufactured by 7 companies were collected from optical shops and used for this study. The exactracts having been prepared by autoclaving 8 lenses in 2.5ml saline. The cell monolayer is then cultured for a further 48 hour period. MTT and SRB assys were performed for cytotoxic effect on cultured cells An inhibition of 30% is considered clear indication of cytotoxic potential in the test material. All the materials were not cytotoxic, but 3 storage solutions of them inhibited growing L929 cells.

• Journal of Korean Ophthalmic Optics Society
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• v.8 no.2
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• pp.85-89
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• 2003

A tear lens formed by between back surface of spherical rigid gas permeable(RGP) contact lens and front surface of cornea shows an excellent correction effect of astigmatism. To study an effects of tear lens power using spherical RGP lens and therefore to utilize them in clinical procedures, we analyze a change of the total astigmatism, the cornea astigmatism, and the residual astigmatism, we derive the following conclusion. 1. Almost all refractive astigmatism below than 2.00D present fully corrected. Thereby resulting good visual acuity. Refractive astigmatism higher than 2.50D show under-corrected and apparent decrease of visual acuity if it is higher than 3.00D. 2. Amount of corneal astigmatism below than 2.50D show acceptable under-corrected while higher than 3.000 present unacceptable visual acuity. 3. An estimated residual astigmatism is not revealed as it is : but it is reduced when it incorporate to refractive astigmatism.

• Journal of Korean Ophthalmic Optics Society
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• v.5 no.1
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• pp.147-154
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• 2000

To describe the prevalence of binocular anomalies in adult Koreans. Patients included were 19 to 40 years of age, 41 males and 60 females and living in Kwang-Ju Korea. Refractive correction was estimated objectively with an autorefractometer and subjectively refined without cycloplegia. Myopia was defined as a refractive error less than -0.50 diopters hyperopia was defined as a refractive error greater than +0.50 diopters. 101 no strabismic patients who had a refractive error and a near lateral phoria(46%) and an AC/A(accommodative convergence/accommodation) anomaly(50.4%). The prevalence of a near vergence anomaly(52.5%) was higher than a near divergence anomaly(55.5%). The prevalence of a positive relative accommodation(PRA) anomaly(61.4%) was higher than a negative relative accommodation(NRA) anomaly(54.5%). According to Morgan's analysis method, patients with vergence anomaly(21.7%) were seen slightly less frequently than those with accommodative interaction anomaly(29.7%). 34.6% of patients had both vergence anomaly and accommodative interaction anomaly. These results indicate that full prescription for a refractive corrections should be considered as these can improve binocular visual function for ametropia.