• Journal of Korean Ophthalmic Optics Society
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• v.16 no.3
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• pp.237-245
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• 2011

Purpose: The present study was conducted to investigate whether certain repeated physical and/or chemical stimuli added on ophthalmic lenses might induce any changes of the functions of lens coatings. Methods: The changes in lens surface, light transmittance, foggy duration, durability of ophthalmic lenses were determined after the application of tearing-off with tape, rubbing with acetone, soaking in acetone or distilled water of ophthalmic lens (CR-39 material) as physical and/or chemical stimuli. Results: The change of ophthalmic lens surface was detected after soaking in acetone for longer than 30 minutes by observing the lens surface to figure out the functional change of hard coating. The ophthalmic lens soaked in distilled water for 180 minutes showed little functional change of anti-reflection coating as 1% by measuring light transmittance of lens. However, the function of anti-reflection coating was almost disappeared after the ophthalmic lens was soaked in acetone for 60 minutes. The foggy duration of ophthalmic lens soaked in acetone was increased by estimating foggy duration of lens. The lens coating was shown to be defected when the pre-damaged ophthalmic lenses were torn off with tape, rubbed with acetone and soaked in distilled water or acetone by observing pre-damaged lens surface to evaluate its durability. Conclusions: The careful management during ophthalmic lens dispensing or usual eyeglass wearing is needed since the change in ophthalmic lens coatings was shown by repeated physical and/or chemical stimuli.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.292-292
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• 2013

최근, 자연의 기능성 표면을 모사하여 우리 생활에 응용하기 위한 연구가 활발하다. 초-발수 특성을 가지는 대표적인 예인 연꽃잎은 마이크로-나노 크기의 거친 미세돌기(papillae)를 가지고 있으며 그 위에 낮은 표면 에너지를 가지는 왁스(wax)가 발달 되어 항상 깨끗한 상태를 유지한다. 본 실험에서는 이를 모사하여 RIE (Reactive Ion Etching)방법을 이용하여 기판인 Poly silicon wafer를 Sf6가스를 사용하여 Metal mash로 거칠기를 만들어 주었고, RF-magnetron sputtering 장치를 사용하여 $6{\times}10^{-3}$ Torr의 진공도에서 낮은 표면에너지를 가지는 PTFE (polytetrafluoroethylene)를 증착하여 표면 구조와 발수특성에 대하여 조사하였다. SSME(Surface shape measurement equipment)측정결과 0.24~0.36 um RSa 값이 측정되었고, 12 uL의 Di-water로 접촉각을 측정 한 결과 RIE 10분 처리를 한 기판 위에 PTFE를 3분 증착하였을 때 가장 높은 $153^{\circ}$의 초-발수 특성이 나타났으며, 4주의 시간이 지났을 때에도 접촉각이 유지가 되었다. XPS 측정결과 초-발수 표면에서 나타나는 CF2와 CF3 피크 값이 측정되었다. Reactive Ion Etching을 이용한 PTFE 발수 특성은 방수, 스마트 윈도우, 자가세정(Self-Cleaning), 디스플레이 표시장치, 김서림 방지(Anti-Fogging), 대전방지 코팅 등에 다각적으로 응용 가능할 것이라 사료된다.