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KMID : 1159320170190020139
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Korean Journal of Vision Science
2017 Volume.19 No. 2 p.139 ~ p.147
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Study for Transmittance Changes with the Thicknesses of ITO and Water-repellent Films of Ophthalmic Lens
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Park Moon-Chan
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Abstract
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Purpose: This study is to observe transmittance changes with the thicknesses of ITO and waterrepellent films of Ophthalmic lens.
Method: ITO, water-repellent, SiO2, ZrO2, hard coating films were coated by electron beam evaporation or a dipping apparatus. The refractive index and extinction coefficient of them with wavelength were obtained using spectrophotometer or ellipsometer. With these data, we observed the changes of transmittances depending on the thicknesses of ITO and water-repellent films of a flat Ophthalmic lens using the Essential Macleod program. The multilayer was designed as [air/ water-repellent film/ ITO/ AR coating multilayer(SiO2, ZrO2) / hard coating(1.553)/ lens(1.56)].
Result: The optimum average transmittance in the absence of ITO and water-repellent films was about 99.5% from wavelength 400 nm to 700 nm. Since the reflectance at the front and back of a flat Ophthalmic lens was similar, the total average transmittance of the lens was about 99%. When the thickness of ITO film was increased at fixing the thickness of water-repellent film, the transmittance of the visible light in the short wavelength was much decreased with compared to that of the long wavelength. When the thickness of the water-repellent film was increased at fixing the thickness of ITO thin film, the transmittance of the long wavelength was decreased. The transmittance of the short wavelength was also decreased up to 50nm thickness, and then increased above that.
Conclusions: When the thickness of ITO film was increased, the transmittance in the short wavelength was much decreased than that of the long wavelength. When the thickness of water-repellent film was increased, the transmittance of the long wavelength was decreased while the transmittance of the short wavelength was decreased up to 50nm thickness but increased above that.
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KEYWORD
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Ophthalmic lens, ITO film, repellent film, Transmittance
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