TONIC Bono Photochromic Polarised Sunglasses.

TONIC Eyewear is the only Photochromic and Polarised sunglasses made using Crystalite Glass: the clearest glass lens currently available.
TONIC optically ground decentered glass lenses, Vistaview™, are a lightweight 1.7mm thin glass, designed for wearing all day long and extremely light weight that you wouldn’t know they are actually glass. All TONIC Polarised glass lenses have an anti-reflective coating on the back surface of the lens, reducing back surface reflection by 45%.

All Style Lenses Feature:
» Polarisation - with Tonic's colour filtration system.
» Crystalite Glass - the clearest glass lens available.
» SliceLens™ - lightweight only 1.7mm thick, lighter than any other.
» Vistaview™ - optical decentered lens, important for true depth and distance.
» ARC™ - anti-reflective coating on the back of the lens to reduce "Bounce Back".

Tonic Colour Filter System

TONIC Glass Photochromic Polarised Grey lens incorporates a 3 Colour Integrated Polarising Filter system using the colours: Green - to retain colour, Aqua - that acts as a splitter to define colour where it normally flattens out, and Grey - that gives deep contrast whilst activating the Photochromic properties. The TONIC Glass Photochromic Polarised Copper lens incorporates a 4 Colour Integrated Polarising Filter system using the same 3 colours as the Grey with an additional Yellow - that enhances colour.