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Authors: Hsin-Yi Tsai 1 ; Chih-Ning Hsu 1 ; Yu-Hsuan Lin 1 ; Kuo-Cheng Huang 1 and Patrick Joi-Tsang Shum 2

Affiliations: 1 Instrument Technology Research Center, Taiwan ; 2 Cathay General Hospital, Taiwan

Keyword(s): Silicone-Hydrogel Contact Lens, Water Content, Oxygen Transmissibility, Photoelectric Method.

Related Ontology Subjects/Areas/Topics: Optical Instrumentation ; Optics ; Photonics, Optics and Laser Technology

Abstract: Nominal oxygen transmissibility (Dk/t) values on commercial product packages are usually of the lens material instead of the actual values of contact lenses (CLs) derived based on their power. To evaluate the Dk/t values of CLs of different powers, we developed a rapid photoelectric method. In the experiment, a photodiode was employed to detect variations in the light intensity passing through silicone hydrogel (Si-Hy) CLs over a period. Light intensity variations can indicate the water content (WC) and power of Si-Hy CLs and help calculate the Dk/t of Si-Hy CLs of different powers. Experimental results indicated that the WC and specific power of Si-Hy CLs were determined by the initial attenuation voltage, which ranged from 0.73 to 1.15 V for the lenses tested herein, whereas the WC varied from 38% to 56%. The Dk/t of Si-Hy CLs at -3.00 D was determined from the voltage variation over 3 min after reaching the peak voltage and the Dk/t corresponding to a specific power could be evalu ated from the ratio of initial attenuation voltage of a lens having a specific power to that having -3.00 D. The results of this study can serve as reference information for quality control in factories. (More)

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Paper citation in several formats:
Tsai, H.; Hsu, C.; Lin, Y.; Huang, K. and Shum, P. (2018). Fast Photoelectric Estimation of Oxygen Transmissibility of Silicone Hydrogel Contact Lens. In Proceedings of the 6th International Conference on Photonics, Optics and Laser Technology - PHOTOPTICS; ISBN 978-989-758-286-8; ISSN 2184-4364, SciTePress, pages 205-212. DOI: 10.5220/0006619702050212

@conference{photoptics18,
author={Hsin{-}Yi Tsai. and Chih{-}Ning Hsu. and Yu{-}Hsuan Lin. and Kuo{-}Cheng Huang. and Patrick Joi{-}Tsang Shum.},
title={Fast Photoelectric Estimation of Oxygen Transmissibility of Silicone Hydrogel Contact Lens},
booktitle={Proceedings of the 6th International Conference on Photonics, Optics and Laser Technology - PHOTOPTICS},
year={2018},
pages={205-212},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0006619702050212},
isbn={978-989-758-286-8},
issn={2184-4364},
}

TY - CONF

JO - Proceedings of the 6th International Conference on Photonics, Optics and Laser Technology - PHOTOPTICS
TI - Fast Photoelectric Estimation of Oxygen Transmissibility of Silicone Hydrogel Contact Lens
SN - 978-989-758-286-8
IS - 2184-4364
AU - Tsai, H.
AU - Hsu, C.
AU - Lin, Y.
AU - Huang, K.
AU - Shum, P.
PY - 2018
SP - 205
EP - 212
DO - 10.5220/0006619702050212
PB - SciTePress