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Thermodynamics and transport of wate...

Fornasiero, Francesco.

Thermodynamics and transport of water through soft-contact-lens materials.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Thermodynamics and transport of water through soft-contact-lens materials.
Author:	Fornasiero, Francesco.
Description:	225 p.
Notes:	Chairs: Clayton J. Radke; John M. Prausnitz.
Notes:	Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4355.
Contained By:	Dissertation Abstracts International66-08B.
Subject:	Engineering, Chemical.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3187034
ISBN:	9780542293672

Thermodynamics and transport of water through soft-contact-lens materials.
Fornasiero, Francesco.

Thermodynamics and transport of water through soft-contact-lens materials. - 225 p.

Chairs: Clayton J. Radke; John M. Prausnitz.

Thesis (Ph.D.)--University of California, Berkeley, 2005.

For soft-contact-lens wearers, corneal health and comfort are highly affected by water, ions, and oxygen transport through the polymeric materials used for contact-lens fabrication. In particular, evaporative water loss at the anterior lens surface is a potential cause of contact-lens dehydration and of post-lens tear-film (PoLTF) depletion, which, in turn, may lead to discomfort, reduced movement of the lens on the eye, lens binding to the cornea, and dry-eye syndrome.

ISBN: 9780542293672Subjects--Topical Terms:

226989
Engineering, Chemical.

Thermodynamics and transport of water through soft-contact-lens materials.
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100 0 $a Fornasiero, Francesco. $3 244838
245 1 0 $a Thermodynamics and transport of water through soft-contact-lens materials.
300 $a 225 p.
500 $a Chairs: Clayton J. Radke; John M. Prausnitz.
500 $a Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4355.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2005.
520 # $a For soft-contact-lens wearers, corneal health and comfort are highly affected by water, ions, and oxygen transport through the polymeric materials used for contact-lens fabrication. In particular, evaporative water loss at the anterior lens surface is a potential cause of contact-lens dehydration and of post-lens tear-film (PoLTF) depletion, which, in turn, may lead to discomfort, reduced movement of the lens on the eye, lens binding to the cornea, and dry-eye syndrome.
520 # $a For this purpose, we develop an extended version of the Maxwell-Stefan multicomponent diffusion equation for species that differ starkly in size (EMS). Equilibrium and transport parameters underpinning the model have been obtained experimentally. We studied three model soft-contact-lens materials: a low-water-content polymacon SCL, a high-water-content hilafilcon-A SCL, and a silicone hydrogel (balafilcon A) SCL.
520 # $a In this work, we develop a solution-diffusion model for transport of water through soft-contact-lens (SCL) materials to study evaporative dehydration of a lens on the eye. The transport model elucidates the mechanism of in-vivo contact-lens dehydration; determines the amount of lens dehydration and lens shrinkage during wear; accesses PoLTF depletion and consequent reduced on-eye movement of the lens and SCL adhesion to the cornea surface. Finally, it predicts possible formation of a rigid, possibly uncomfortable, glassy skin on the anterior surface of the lens under highly dehydrating conditions.
520 # $a The large variety of recipes for contact-lens materials, the difficult control of in-vivo conditions, the interplay of numerous environmental and geometrical factors, and intersubject variability greatly complicate in-vivo experimental study of SCL dehydration, precluding a full quantitative understanding of the process and the definition of unambiguous SCL design criteria.
520 # $a We obtain also the SCL glass-transition temperature as a function of water content by modulated differential scanning calorimetry. These data are used in our calculations to predict the formation of a glassy skin on the SCL anterior surface induced by dehydration during wear. (Abstract shortened by UMI.)
590 $a School code: 0028.
650 # 0 $a Engineering, Chemical. $3 226989
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710 0 # $a University of California, Berkeley. $3 212474
773 0 # $g 66-08B. $t Dissertation Abstracts International
790 $a 0028
790 1 0 $a Prausnitz, John M., $e advisor
790 1 0 $a Radke, Clayton J., $e advisor
791 $a Ph.D.
792 $a 2005
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