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Study: Coefficient of friction similar in two silicone hydrogels, human cornea
The coefficient of friction of 1-Day Acuvue TruEye contact lenses (narafilcon A) and Acuvue Oasys contact lenses (senofilcon A) was reported to be comparable to a human cornea, according to a press release from Johnson & Johnson Vision Care Inc.
The research was presented at the British Contact Lens Association Clinical Conference by Wilson and colleagues via a poster.
Researchers simulated wear and utilized a micro-tribometer to measure the friction, as detailed in the release. The coefficient of friction (CoF) results for the contact lenses were then compared with human corneal tissue data that had been published using the same techniques.
Results showed that mean CoF of the 1-Day Acuvue TruEye contact lenses was 0.0080 directly out of the package and 0.0098 after 18 hours. Mean CoF of the Acuvue Oasys contact lenses was 0.0104 directly out of the package and 0.0116 after 18 hours. Comparably, the CoF of the human cornea was reported to be 0.0153, the release stated.
“These results suggest that the lens surface of these two contact lens brands is as lubricious as the human cornea,” Tawnya Wilson, OD, principal research optometrist at Johnson & Johnson Vision Care, said in the release. “This is important, because coefficient of friction has previously been shown to be one factor highly correlated with contact lens comfort. The 1- Day Acuvue TruEye and Acuvue Oasys seem to mimic corneal properties that may help address end-of-day comfort for many of our patients.”
According to the company, 1-Day Acuvue lenses are meant to be disposed of daily; Acuvue Oasys lenses are indicated for 2 weeks of daily wear or 6 nights of continuous wear.
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Wilson T, et al. Comparison of frictional behavior of human corneal tissue and silicone hydrogel contact lenses. Poster presented at 2014 British Contact Lens Association Clinical Conference; June 7, 2014.