Impact of manufacturing technology and material composition on the mechanical properties of hydrogel contact lenses
Maldonado-Codina, Carole & Efron, Nathan (2004) Impact of manufacturing technology and material composition on the mechanical properties of hydrogel contact lenses. Ophthalmic and Physiological Optics, 24(6), pp. 551-561.
Hydrogel materials are not only different as a result of different co-monomer compositions but also as a result of the manufacturing method used to produce them. Hydrogel contact lenses fabricated by different methods are subjected to markedly different processing steps, which are likely to affect the resultant material network structure of a lens. The mechanical performance of five soft contact lens types was investigated using one conventional technique (tensile test) and three novel techniques (probe, tear and ball milling tests). The five lens groups consisted of three polyhydroxyethyl methacrylate (pHEMA) lenses which were each manufactured by a different technique: lathing, spin-casting and cast-moulding, a HEMA/methacrylic acid (HEMA/MAA) cast-moulded lens and a HEMA/glycerol methacrylate (HEMA/GMA) cast-moulded lens. Overall, the results show that the best mechanical performance is obtained for the pHEMA lenses, with some differences occurring between the lenses. The HEMA/GMA lens showed the worst performance.
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|Item Type:||Journal Article|
|Additional Information:||For more information, please refer to the journal’s website (see hypertext link) or contact the author.|
|Keywords:||contact lens, manufacture, mechanical properties, polymerisation|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)|
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Optical Technology (111302)
|Divisions:||Current > Research Centres > Centre for Health Research|
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
|Copyright Owner:||Copyright 2004 Blackwell Publishing|
|Copyright Statement:||The definitive version is available at www.blackwell-synergy.com|
|Deposited On:||28 Nov 2007|
|Last Modified:||29 Feb 2012 23:29|
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