The rub and rinse technique for cleaning contact lenses remains the most effective way of cleaning soft contacts with multipurpose disinfection solutions, according to a new report.
A report published in the August issue of Optometry and Vision Science, the official journal of the American Academy of Optometry, claims that the rub and rinse method is most effective at eliminating micro-organisms on contacts, even when using "no-rub" disinfection solutions.
Dr Hua Zhu, from the Brien Holden Vision Institute in Sydney, Australia, commented: "Rub and rinse, in conjunction with soaking of the lens, is the most effective regimen to recommend with all the multipurpose lens care solutions used with any type of contact lenses."
The study involves researchers comparing the efficacy of three different regimens for soft contact lenses cleaning with multipurpose disinfection solutions - rub and rinse, rinse only, and no rub or rinse.
These three processes were carried out using commercially available multipurpose disinfection solutions, including "no-rub" products, with numerous cleaning techniques, disinfection solutions and lens types used.
Scientists measured them for their effectiveness in removing cultured bacteria, yeast, and mould cells and found that germ removal with multipurpose disinfection solutions were more effective when "rub and rinse" was performed before soaking.
Conversely, the "no rub and no rinse" method resulted in more micro-organisms remaining on the contact lenses.
"We believe this step, when used with any multipurpose disinfection solution, will promote lens disinfection against all types of microorganisms, and subsequently prevent colonisation of the eye by pathogenic organisms, thus providing protection to contact lens wearers," Dr Zhu stated.
by Adrian Galbreth