• Journal of Korean Ophthalmic Optics Society
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• v.2 no.1
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• pp.91-95
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• 1997

A General equation is developed for the efficiency of an integrating sphere with a nonuniform coating. The only assumptions are that the interior is a perfect sphere and that all areas reflect perfectly diffusely. The general equation are examined for the basic applications of integrating spheres as mixing mechanisms in hemispherical reflectance measurements and in absolute reflectance techniques.

• Journal of Korean Ophthalmic Optics Society
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• v.2 no.1
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• pp.55-60
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• 1997

Numerically compares a calculation about a variable process of visual acuity for a artificial myopia with previously the tested result. The calculation is used to the value of Gullstrand's theoretical eyes and a method of geometrical optics. The theoretical eye simplified a entrance pupil and retina. Optical lens and eye changed a equivalent lens. Refractive power of a equivalent lens is converted to focal length within theoretical eyes, and this was calculated about relation of a blur circle on the retina and visual acuity.

• Journal of Korean Ophthalmic Optics Society
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• v.2 no.1
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• pp.31-43
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• 1997

In this paper, the rate of transmittance regarding the home -and foreign-made lens that have been treated with multi coating and no coating has been studied in the range of the visible ray. The lens that were treated with No Coating turned out to be about 93% of the rate of transmittance, but those treated with Coating turned out to be over 98%. Especially, the rate of transmittance of product made by a company in a foreign country turned out to be homogeneous in the whole range.

• Journal of Korean Ophthalmic Optics Society
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• v.12 no.2
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• pp.87-93
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• 2007

Eye examination was performed for diagnosis accommodative and binocular dysfunction. The prevalence rates were similar to other studies, therefore patients required not just the correction of the refractive error but a specific treatment for each diagnosed problems. Two symptomatic(diplopia, asthenopia, and intermittent blur) patients diagnosed as a convergence insufficiency was given full correction with visual training for 4weeks. They had a one or mixed binocular problems included accommodative insufficiency. Following 4 weeks later, visual training was effective to Improve convergence and suggest that continuous observation is necessary.

• Journal of Korean Ophthalmic Optics Society
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• v.8 no.1
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• pp.23-28
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• 2003

We report a switchable RGB color filters for Lab on a chip. Ink color filter devices are fabricated by PDMS patterning process. The optical transmission in the ultra-violet and visible wavelengths of color filters have been investigated. The ink color filters are characterised by the slope and shape of the spectrum. The transmission of red/yellow filter consists of curves with a sharp cut-off spectrum at 600 and 500 nm. The blue output of the ink filter has 80% peak transmission and weak red-leak, while the green ink filter has 48% peak transmission and red-leak.

• Journal of Korean Ophthalmic Optics Society
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• v.8 no.1
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• pp.47-52
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• 2003

The metallurgical and mechanical experiments of Titanium frame were conducted to investigate the optimum brazing and the improved brazed joints by filler metals has been developed by using other filler metals at brazing process. The filler metal is used in form of a metallic glass. The optimum brazing conditions were obtained from microstructural observation of brazed joints chemical analysis by means of X-ray micro-analysis and heating method.

• Journal of Korean Ophthalmic Optics Society
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• v.1 no.2
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• pp.43-47
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• 1996

For youths of both sexes which can read the letter chap of 1.0 acuity without lens, tests the fogging technique and examines the development of visual acuity. And compare the numerical function with the result of the variation of the blur circle on the retina when the power of the fogging lens varies. The variation of visual ac acuity for the fogging technique keeps constantly the balance for binocular.

• Journal of Korean Ophthalmic Optics Society
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• v.6 no.1
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• pp.145-148
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• 2001

SiC composites were developed by incorporating glass phase into SiC, in the light of improving mechanical properties of material for spectacle lens cutting. Specimens for spectacle lens cutting with glass phase as sintering additives have been fabricated by hot-pressing at $1810^{\circ}C$ for 2 hr under a pressure of 25 MPa. The fracture toughness and hardness of hot-pressed specimens were characterized and compared with previous works. Typical hardness and fracture toughness of materials for spectacle lens cutting were 12 GPa and $5.1MPa{\cdot}m^{1/2}$ respectively.

• Journal of Korean Ophthalmic Optics Society
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• v.6 no.1
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• pp.81-85
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• 2001

The color vision was composed of the wavelength absorption of three R. G. B cone photo-receptors and the r-g, y-b channel of an opponent process. The color vision defects mechanism for the electric circuit made up a photo cell, relay switch and transformer. This mechanism very well applied to the color vision defects mechanism owing to be y-b chromatic valence function in case of a cone R or G defects and to be r-g chromatic valence function in case of a cone B defects.

• Journal of Korean Ophthalmic Optics Society
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• v.6 no.1
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• pp.87-91
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• 2001

The a-C:H films have been grown on the glass substrate by PECVD method, where plasma was generated with a 60 Hz line power source. The carbonization is checked from peak intensities of D($sp^3$) and G($sp^2$) peaks in Raman spectra and is analyzed using the Gaussian convolution method of spectrum. Both the bonding strength of C-H and the ratio of $sp^3$ to $sp^2$ in bonding are found to be slightly dependent of partial pressure of $C_2H_2$.