PK National Eyecare Group - Supporting your Independence Privacy Policy Terms of Use For the last couple of year NEG have been working closly with PPG, who developed Trivex, to promote the use of this exciting material through a number of our prefered suppliers. We have run a number of promotions and educational activity, to help members build the Trivex material in to their business model, be it under the PNX, Trilogy or NXT branding. For more information on the material and its benefits please click on the Trivex logo, for information on our current activity please   You may also like to follow the trilogy links to view a couple of interesting videos on the Younger Optics website.