Investigation of Lubrication Characteristics for a Soft Contact Lens

Abstract:

It is popular to wear the contact lens nowadays. Also, the output value of the contact lens is estimated more than 4 billion NT dollar every year. Because the phenomena of the contact lenses are very complicated, the relevant mechanisms are not well understood. Thus, the security of contact lens needs to be further investigated. In the lubricated mechanism of the contact lens, there is a layer of tear between the contact lens and cornea. The contact lens’ behavior is akin to that of a slider bearing. The lens represents the slider, the eye plays the role of the stationary pad, and the tear film is the lubricant. Hence, hydrodynamics and contact mechanisms of a contact lens are quite a fascinating subject that is relevant to the science of tribology. In the paper, the lubrication mechanisms include the partial hydrodynamic lubrication (contact lens roughness), contact mechanics and Newtonian fluid mechanics have been established. The parameters of roughness, flow factor, tear film geometry, and hydrodynamic pressure distribution are discussed. The developed technology increases the safety of contact lens.

• Periodical: Key Engineering Materials (Volume 823)
• Pages: 105-109
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.823.105
• Online since: September 2019
• Authors: Hung Jung Tsai*, Jeng Haur Horng, Chung Ming Tan
• Keywords: Contact Mechanics, Partial Hydrodynamic Lubrication, Soft Contact Lens

References

[1] T. T. Hayashi: Mechanics of Contact Lens Motion (Ph.D. thesis, University of California, Berkley 1997).

[2] R. B. Mandell: Contact Lens Practice (Charles C. Thomas Publishers, Springfield, IL 1994).

[3] S. Kamiyama and M. M. Khonsari: ASME Journal of Tribology, Vol. 122 (2000), p.573.

[4] J. M. Tiffany: Int. Ophthalmol, Vol. 15 (1991), p.371.

[5] J. M. Tiffany: Adv. Exp. Med. Biol., Vol. 384(1994), p.267.

[6] Y. S. Yun, B. E. MCcAREY and C. Amos: Invest. Ophthalmol. Vis. Sci., Vol.34 (1993), p.1470.

[7] Y. Danjo, M. Nakamura, and T. Hamano: Jap. J. Ophthalmol, 38 (1994), p.260.

[8] N. Patir and H. S. Cheng: ASME Journal of Lubrication Technology, Vol. 100 (1978), p.12.

[9] N. Patir and H. S. Cheng: ASME Journal of Lubrication Technology, Vol. 101 (1979), p.220.

[10] J. H. Tripp: ASME Journal of Lubrication Technology, Vol. 105 (1983), p.458.

[11] T. K. Yu, C. C. Yu and M. Oriowski: Proc. IEEE Int. Electron Devices Meeting, Washington D. C., (1994) p.35.4.1.

[12] J. A. Greenwood and J. B. P. Williamson: Proc. R. Soc. London, Vol. A295 (1996), p.300.

[13] H. J. Tsai, Y. R. Jeng and P. Y. Huang: Proc. IMechE Part J: J. Engineering Tribology, Vol. 222 (2008), p.761.