Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/13778

TitleSoft contact lens surface profile by atomic force microscopy
Author(s)Giraldez, Maria J.
Serra, Carmen
Lira, Madalena
Oliveira, M. Elisabete
Yebra-Pimentel Vilar, Eva
KeywordsAtomic force microscopy,
Contact lens
Hydrogel
Surface analysis
Surface roughness
Issue dateFeb-2010
PublisherAmerican Academy of Optometry (AAOPT)
JournalOptometry and Visiov Science
Abstract(s)Purpose. This study was designed to qualitatively and quantitatively characterize the surface morphology of four unworn conventional hydrogel contact lenses (omafilcon, hioxifilcon, nelfilcon A, and ocufilcon B) and two silicone-hydrogel contact lenses (senofilcon A and comfilcon A) without surface treatment. Methods. Surface roughness was assessed using atomic force microscopy in Tapping ModeTM to determine the representative roughness parameters mean surface roughness (Ra), mean square roughness (Rms), kurtosis (Rku), and skewness (Rsk). To date, these last two parameters have not been used to characterize contact lens surfaces. Rku provides information on the distribution of spikes above and below the mean line, and Rsk provides information about the asymmetric roughness of surfaces. The surface topography of the lenses was also mapped in detail. Results. In all the lenses, higher Ra and Rms values were obtained when larger surface areas were examined. The daily replacement contact lenses (nelfilcon A and ocufilcon B) showed the highest Ra and Rms values but according to their Rku scores, their surface profiles were less spiky than the remaining lenses. On the contrary, the lowest Ra and Rms values were recorded for comfilcon A and omafilcon A, which also exhibited the spikiest surface profiles. All the materials except the hioxifilcon showed a predominance of peaks (Rsk) over troughs. Conclusions. The shape parameters Rku and Rsk are useful for characterizing contact lens surfaces, because they provide different yet complementary information to that offered by Ra and Rms. Precise knowledge of the shape profile of a contact lens surface will give an idea of its susceptibility to deposit formation or colonization by microorganisms.
Typearticle
URIhttp://hdl.handle.net/1822/13778
DOI10.1097/OPX.0b013e3181e170c5
ISSN1040-5488
Publisher versionhttp://journals.lww.com/optvissci/Fulltext/2010/07000/Soft_Contact_Lens_Surface_Profile_by_Atomic_Force.6.aspx
Peer-Reviewedyes
AccessrestrictedAccess
Appears in Collections:CDF - FAMO - Artigos/Papers (with refereeing)

Files in This Item:
File Description SizeFormat 
Geraldez M. et al (OCV) 2010-2.pdfarticle814,02 kBAdobe PDFView/Open    Request a copy!

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu Currículo DeGóis