• Journal of Korean Ophthalmic Optics Society
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• v.8 no.1
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• pp.85-90
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• 2003

A Netspec lens has the form having the 2-dimensional mesh coating on a general ophthalmic lens. It is known that it makes the ophthalmic image see more clearly, reducing the ophthalmic fatigue and that the transmittance of it for ultraviolet and infrared rays is lower. We need to prove this characteristic scientifically. So, in this study, we applied the Kirchhoff's scalar wave theory to the Netspec lens and induced a transmittance expression. And we made the program of which simulation can explain the transmittance effect of the Netspec lens. Also, we tried the interpreting about the result of the simulation. Finally, we have known that this simulation program can be used to adjust the transmittance of the light according to the wavelength.

• Journal of Korean Ophthalmic Optics Society
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• v.6 no.1
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• pp.55-58
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• 2001

The rigid gas permeable(RGP) contact lens has nearly side effect on the cornea. So that, this lens has used the clinical reflective correction of the eye. This study have used several methods for research the fine internal structure on the RGP contact lens by scanning electron microscopy. The results have indicated that the postfixation of 1% $OsO_4$ and tannic acid is responsible for a fine structure in the internal plane of RGP contact lens. These internal surface of contact lens appeared the several shape of the hole of the stereo shape form with arrangement of round form. But, on the contact lens with non-postfixation, the stereo shape have not present and the boundary of the vesicle have not clear. Maybe, these results suggest that the fixation methods have effect on the morphological characters of materials on the RGP contact lens.

• Journal of Korean Ophthalmic Optics Society
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• v.16 no.3
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• pp.229-235
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• 2011

Purpose: The present study was performed to evaluate the safety of ophthalmic lenses in domestic market since eyeglasses wearers could be exposed to the negligent accident by damaged ophthalmic lenses. Method: Totally, 160 ophthalmic lenses (NK55, ${n_{d}}$ = 1.56) with the refractive powers of -3D, -6D, +3D, +6D manufactured by 4 companies in domestic market were evaluated using drop ball test. In accordance with FDA standard, steel ball (~16 g) was freely dropped on these ophthalmic lenses from 127 cm high and the surfaces of lenses were observed. Results: From the study, center thicknesses of NK55 ophthalmic lenses manufactured by 4 different companies showed somewhat different numbers even though the lenses had the same refractive index and powers. All convex lenses of +3D, +6D were evaluated as the safe lenses since there was no damage such as crack and broken found on the lens surfaces after drop ball testing. However, some noticeable broken was shown on the surfaces of concave lenses with relatively thinner center thickness. Especially, 59(73.8%) of total 80 concave lenses with the refractive power of -3D and -6D classified as unacceptable lenses to FDA standard. Conclusions: From the results, the negligent accident by damaged ophthalmic lenses should be considered as well as the correction of visual acuity, design and price when customers purchase eyeglasses. Thus, the enforcement regulation like drop ball testing of uncut ophthalmic lens could be suggested to guarantee the safety of ophthalmic lenses in domestic market.

• Journal of Korean Ophthalmic Optics Society
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• v.3 no.1
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• pp.249-258
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• 1998

This study was researched the state and problem of the soft contact Lens wear by the history and inverted microscopy. The results was as follows; 1. The first use of contact lens wear was the 15 years and the last use was the 26 years. The first age of most contact lens wear was the 19 years. 2. In the almost contact lens wearers, the first visual test was the optical shop. 3. At present, almost soft contact lens purchase the optical shop 4. At present, most contact lens wearer like a soft type. 5. At present, most soft contact lens were a domestic production, and some subjects were foreign country production, but some subjects were unknown. 6. After contact lens wear, most subjects don't known the corrected visual acuity, especially, almost people don't known the binocular visual acuity. 7. At present, on soft contact lens color, the teens like the non-color contact lens, twenties like the color contact lens, but thirties was not known. 8. On the advantage of soft contact lens knowledge, most teens and twenties were only one, thirties was unknown. 9. On the disadvantage of soft contact lens knowledge, most teens and thirties were only one, twenties were two. 10. On the side effect of soft contact lens wearer, teens was one, and twenties and thirties don't known. 11. On the main symptoms of soft contact lens wearer, total kinds were seven, On these kinds, most subjects were not symptoms, the next order was unknown on the symptom. But, On the symptoms, the main symptoms was the pain and dry eye. 12. At present, the research on the surface morphology of soft contact lens by inverted microscope, the lens repture, lens folding, foreign body immersion and etc were present. Above the study, most contact lens was soft lens, and the purchase was the optical shop, on the other hand, the knowledge of soft contact lens and visual acuity was few. As a results, On the practical problems of soft contact lens wear, the optician have to the soft contact lens treatment and aftercare by law and educational supporting.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.05a
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• pp.356-361
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• 2004

A moving-magnet type pickup actuator has an assembly error . That is, the actuating part of an actuator is shifted from initial position after we assemble it into yoke. This is the result of an effect of magnetic force between magnet and yoke. We performed magnetic-analysis using FEA. As a result of simulation, we improved the assembl ing efficiency for moving-magnet type actuator.

• The Optical Journal
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• no.5 s.115
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• pp.66-67
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• 2008

국내 광산업은 80년대 카메라, 복사기 등 결상기기 중심에서 90년대 이후에는 결상기기와 더불어 레이저 가공기, 광정보기기, 광통신기기 등 광응용기기로 확대 되고 있다. 2005년 기준으로 볼 때 국내 광산업은 세계시장에 약 5,5%를 차지했으며, 정밀 광산업 기술로드맵과 직접 관련되는 광정밀기기, 광정보기기, 광학기기분야의 수입은 68%, 수출이 90%를 차지해 수출역점산업임을 알 수 있다. 따라서 2010년에는 광산업 세계시장규모가 400조 원 수준에 이를 것으로 예상되는 가운데 이에 대비하여 국내 광산업의 성장기틀을 다질 때이다. -본 고는 한국광학기기협회에서 작성한 정밀광학기기 분야의 기술로드맵 내용 중 f-$\theta$ 렌즈광학계 분야의 시장 전망과 국내 기술 현황에 대한 내용을 발췌, 정리한 것이다.

• Journal of the Korea society of information convergence
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• v.5 no.2
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• pp.77-83
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• 2012

This study was cosmetic contact lens wear for up to 2 weeks in for the evaluation of the insertion. In 1 week during weeks 1 and 2 has been rated 'positive' or 'insert' easy insertion and removal of lenses in the mirror when I saw the 'red eye' negative 'rating in 18 patients (45 %), in 2 shown in 14 patients (35%) as a 'negative' rating over time, depending on the awareness hyperemia has been reduced could see. Future lens purchases from doctors' Week 1 at the 2nd week, came as a result of the positive> negative evaluation was positive = negative. Rating, but usually more than 1 week, 2 weeks, 26 patients (65%) showed no change. State upon insertion of sight, wearing period increased dryness and showed a more positive assessment, the Comfort showed similar ratings. Somewhat negative assessment upon removal of vision status, comfort, dryness, day-to-day life at present, but in both state vision, comfort, dryness positive assessment appears worn than when a positive evaluation appears was unknown.

• Korean Journal of Optics and Photonics
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• v.13 no.6
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• pp.506-509
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• 2002

An optical system for a stereoscopic video recorder is designed with the field of view 42$^{\circ}$ and effective diameter 22 mm. We can use it by attaching it to the front lens of any video camera or camcorder to record a stereoscopic scene. This system is a double Kepler type afocal system to make the image erect and a bi-ocular type to record and display the stereoscopic scene. The optical tube length is folded with several flat mirrors and a beam splitter to be compact. This optical system is composed of 4 groups of lenses and each group serves as a relay lens for minimizing the vignetting effect. Whole field stereoscopic scenes may be captured by perpendicularly polarized alternated recording with a chopper and two perpendicular polarizers, without any loss of light energy. The displayed images may be seen stereoscopically with polarized spectacles and are kinetic because of an afterimage effect.

• Applied Microscopy
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• v.29 no.2
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• pp.231-239
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• 1999

Morphological changes of Drosophila ocellar corneagenous cells were studied to the development with electron microscopy, and the movement of produced proteins was traced with autoradiography. Corneagenous cells of immediate postemergence showed very active secretion pattern. However, a few days after the emergence, the secretory activity of corneagenous cell was supposed to be dropped suddenly. In autoradiography, almost of proteins that produced by corneagenous cells moved toward lens. From this, it was supposed that the corneagenous cells do not function in photoreceptor cells rather in the formation of lens at the postemergence stage. Corneagenous cells of pupal stage were well developed. In the period of lens formation, rER of corneagenous cells were well developed and it suggested very active material metabolism. Granules and microtubules were also frequently observed and the later would be a pathway of the movement of materials. In conclusion, corneagenous cells were well developed at vigorous lens forming stage. After emergence, when the lens formation was completed, both the function and the size of corneagenous cells were reduced.

• Proceedings of the Optical Society of Korea Conference
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• 2001.02a
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• pp.84-85
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• 2001

광학장비의 결상성능은 회절변조전달 성능(diffraction MTF) 이나 Strehl ratio 로 표시할 수 있다. 광학 렌즈 또는 거울의 표면 형상오차 등에 기인한 광학성능 저하는 이론적으로 잘 알려져 있으며, 입사동에서의 위상변조를 통하여 초분해능 광학계를 개발할려는 연구도 활발히 진행되고 있다. 헬기에 장착되어 야간 표적 획득 시스템으로 사용되고 있는 전방관측 적외선 열상장치는 볼 내부에 장착되며, 적외선 통과창으로서 이용되는 Ge 윈도우를 통하여 외부 영상을 획득한다. (중략)