Development of Instant Measuring Model for Oxygen Permeability and Water Content of Hydrogel Contact Lens

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

2017

Abstract

The diffusion coefficient D, gas solubility k of material and the thickness of lens t were used to evaluate the oxygen permeability Dk/t of contact lenses (CLs). However, the nominal value Dk/t is usually not consistent with the actual oxygen permeability of wearing CL. As the oxygen travel through the hydrogel, it need to be carried by water molecules in the lens material; thus, the higher the water content (WC) of the material, the higher the Dk/t value. In order to obtain the WC and Dk/t of wearing CL, we create a testing platform to simulate the wearing status of CL. When the light traveled through the lens, we found that the attenuation in green light is smoother than other wavelengths. Moreover, the WC is higher, its dewatering rate at room temperature is lower, and the light attenuation is relatively smaller. Comparing with the other CL of similar WC, the Dk/t of CL is higher if it has higher dehydration. In the study, we evaluated the WC and Dk/t of hydrogel CL based on the light attenuation in eight minutes. The attenuation degree of light after traveling through the CL can be used to estimate the Dk/t of hydrogel CL.

Paper Citation

in Harvard Style

Hung C., Huang K., Tsai H., Lin Y. and Shum P. (2017). Development of Instant Measuring Model for Oxygen Permeability and Water Content of Hydrogel Contact Lens . In Proceedings of the 5th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS, ISBN 978-989-758-223-3, pages 175-182. DOI: 10.5220/0006107301750182

in Bibtex Style

@conference{photoptics17,
author={Chih-Wei Hung and Kuo-Cheng Huang and Hsin-Yi Tsai and Yu-Hsuan Lin and Patrick Joi-Tsang Shum},
title={Development of Instant Measuring Model for Oxygen Permeability and Water Content of Hydrogel Contact Lens},
booktitle={Proceedings of the 5th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS,},
year={2017},
pages={175-182},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0006107301750182},
isbn={978-989-758-223-3},
}

in EndNote Style

TY - CONF
JO - Proceedings of the 5th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS,
TI - Development of Instant Measuring Model for Oxygen Permeability and Water Content of Hydrogel Contact Lens
SN - 978-989-758-223-3
AU - Hung C.
AU - Huang K.
AU - Tsai H.
AU - Lin Y.
AU - Shum P.
PY - 2017
SP - 175
EP - 182
DO - 10.5220/0006107301750182