Trivex Eyeglass Lenses: Trivex lenses, developed in the United States by PPG Industries, are available in a wide variety of lens designs and features, including progressive lenses and photochromic lenses. For the best comfort, vision and appearance, it's a good idea to have an anti-reflective coating applied to Trivex lenses. This microscopic coating eliminates light reflecting from the front and back surfaces of the lenses, giving the lenses a crystal-clear appearance. Developed for Lightweight Protection It's always smart to choose a lens based on its strength and safety profile — particularly for protective eyewear for kids, sports eyeglasses and sunglasses.
Trivex lenses excel in this regard.
Trivex lenses Trivex lenses are lightweight and resist cracking, making them a great choice for rimless frames. This one is by Silhouette International. Trivex lens material was originally developed for use by the military in helicopter windshields and fighter jet canopies. Then, in 2002, PPG Industries tailored the chemistry of the material specifically for use in optical lenses, making Trivex one of the most lightweight, impact-resistant eyeglass lens materials available. In fact, only polycarbonate lenses rival the protection and lightweight comfort of Trivex lenses. THE BENEFITS OF AUTHENTIC
MANUFACTURER LENSES Authentic Manufacturer Lenses Are Higher Quality and More Durable Not all lenses are created equal. which include UV protection and a scratch-resistant coating. SHOP PREMIUM LENSES How Trivex Differs from Polycarbonate For years, polycarbonate lenses have been the industry standard for safety glasses and children's eyewear. But many eye care practitioners now offer Trivex lenses as an alternative to polycarbonate (or "poly") lenses. Trivex and polycarbonate lenses have a lot in common when it comes to being exceptionally lightweight and impact-resistant — properties that make both lenses equally suited for safety glasses, sports glasses and other protective eyewear. But they differ in how they are manufactured and other properties. Trivex lenses are cast moulded, while polycarbonate lenses are injection moulded.
The cast moulding process mimics how most other plastic and high-index plastic lenses are made: a liquid monomer is poured into moulds and hardened in heated ovens. Injection moulding is much quicker: solid polycarbonate pellets are superheated, then the resulting liquid is injected into pressurizing moulds and quickly cooled. The slower cast moulding process used to create Trivex lenses results in sharper optics than injection moulding, according to PPG Industries. Also, Trivex lenses have a higher Abbe value than polycarbonate lenses.
This is a measure of how likely white light is dispersed into its component colours as it passes through a lens material — an optical imperfection is known as chromatic aberration One very important property of an optical lens material is the Abbe value. It is a measure of the degree to which light is dispersed or separated when passing through a lens. The dispersion occurs at any time when white light is broken into its component colours. If the Abbe value is too low, then the light dispersion will cause chromatic aberration which appears in one's vision to be like a rainbow around viewed objects especially noticed around light sources. The higher the Abbe value, the better the peripheral optics will be.
The lower the Abbe value, the more chromatic aberration will be a characteristic of that lens. Human eyes can not detect the chromatic aberration if the Abbe number is above 40. . Lens materials with a high Abbe value tend to cause less chromatic aberration than those with low Abbe values. Trivex lenses have an Abbe value of 45 (better than average among eyeglass lens materials) polycarbonate lenses have an Abbe value of 30 (lowest among all lens materials). Under certain conditions (and especially with high prescription powers), lenses with a low Abbe value might cause the wearer to notice a coloured halo or "fringe" around lights or to experience slightly blurred or distorted peripheral vision.
Trivex lenses also have a higher tensile strength than polycarbonate lenses. This is significant when it comes to mounting lenses in minimalist-design rimless frames, where small holes are drilled in the lenses to attach them to the frame. Because of their superior tens
