Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/35817
Title: Microbial adherence to cosmetic contact lenses
Authors: Chan, KY
Cho, P 
Boost, M
Keywords: Microbial adherence
Bacterial adherence
Decorative contact lenses
Cosmetic contact lenses
Coloured contact lenses
Issue Date: 2014
Publisher: Elsevier
Source: Contact lens and anterior eye, 2014, v. 37, no. 4, p. 267-272 How to cite?
Journal: Contact lens and anterior eye 
Abstract: Aim: To investigate whether cosmetic contact lenses (CCL) with surface pigments affect microbial adherence.
Method: Fifteen brands of CCL were purchased from optical, non-optical retail outlets, and via the Internet. A standardized rub-off test was performed on each CCL (five lenses per brand) to confirm the location of - the pigments. The rub-off test comprised gentle rubbing on the surfaces of each CCL with wetted cotton buds for a maximum of 20 rubs per surface. A new set of CCL (five lenses per brand) were incubated in Pseudomonas aeruginosa overnight. Viable counts of adhered bacteria were determined by the number of colony-forming units (CFU) on agar media on each lens. The adherence of P. aeruginosa as well as Staphylococcus aureus and Serratia marcescens to three brands of CCL (A-C) (five lenses per brand) were also compared to their adherences on their clear counterparts.
Results: Only two of the 15 brands of CCL tested (brands B and C) had pigments that did not detach with the rub-off test. The remaining 13 brands of CCL all failed the rub-off test and these lenses showed higher P. aeruginosa adherence (8.7 x 105-1.9 x 106 CFU/lens). Brands B and C lenses showed at least six times less bacterial adhesion than the other 13 brands. Compared to their clear counterparts, bacterial adherence to brands B and C lenses did not differ significantly, whereas brand A lenses showed significantly higher adherence.
Conclusion: Surface pigments on CCL resulted in significantly higher bacterial adherence.
URI: http://hdl.handle.net/10397/35817
ISSN: 1367-0484
DOI: 10.1016/j.clae.2013.12.002
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