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The Design of Polymers for Contact Lens Applications by Brian J. Tighe is a Materials Science article available to read on EtoBox.

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## Abstract The use of thermoplastics, elastomers and hydrogel polymers in contact lens applications is discussed in terms of the balance of properties required for the lens to function in a satisfactory manner. Although there are several thermoplastics that would appear to offer advantages over poly(methyl methacrylate), the most widely used polymer, the inherent disadvantages are in each case too great. The clarity, toughness, physiological inactivity and ease of fabrication are shared by many polymers, but its critical surface tension governing as it does the maintenance of a coherent tear film on the lens surface is unique amongst materials that are otherwise acceptable. The development of hydrogel polymers is discussed in terms of the potential use of this group of polymers in lenses designed for continuous as distinct from daily wear. The specific requirements of such a lens are considered in the light of the properties possessed by the cornea. Apart from the optical properties of thin (∼0.2 mm) sections of material, the most important parameters are oxygen permeability (since the cornea is avascular a relatively high permeability is required), mechanical properties (the mate

Who reads The Design of Polymers for Contact Lens Applications?

Author

Brian J. Tighe

Publisher

Wiley (John Wiley & Sons); Society of Chemical Industry; Wiley (ISSN 0007-1641)

Published

1976

Language

EN

Field

Materials Science (Physical Sciences)