TS Sunglasses Pilot Version Pure Titanium Frame/Nylon Polarization Glass/Tail-Oil. Pure Titanium Frame. First, you can tell pure titanium eyeglasses frames by checking the weight. Titanium eyeglasses frames are much lighter than other metal frames. Next, check whether there are signs of discoloration or corrosion. Titanium should have no signs of signs of discoloration or corrosion because titanium is a corrosion-resistant metal. Anti-Glare, Restore The Real Color. Reflective film applied to the outside surfaces of some sunglass lenses. They reduce glare by reflecting much of the light that hits the lens surface. Mirrored coatings make objects appear darker than they are, so lighter tints are often used to compensate for this.