Fast Photoelectric Estimation of Oxygen Transmissibility of Silicone Hydrogel Contact Lens

Hsin-Yi Tsai, Chih-Ning Hsu, Yu-Hsuan Lin, Kuo-Cheng Huang, Patrick Joi-Tsang Shum

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 evaluated 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.

Download


Paper Citation


in Harvard Style

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 - Volume 1: PHOTOPTICS, ISBN 978-989-758-286-8, pages 205-212. DOI: 10.5220/0006619702050212


in Bibtex Style

@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 - Volume 1: PHOTOPTICS,},
year={2018},
pages={205-212},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0006619702050212},
isbn={978-989-758-286-8},
}


in EndNote Style

TY - CONF

JO - Proceedings of the 6th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS,
TI - Fast Photoelectric Estimation of Oxygen Transmissibility of Silicone Hydrogel Contact Lens
SN - 978-989-758-286-8
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