When Were Polycarbonate Lenses Invented? Polycarbonate lenses were introduced sometime in the 1980s by the Gentex Corporation. This new eyeglass lens material had a high index of refraction, making it to be the lightest and thinnest lens material available then. When did polycarbonate lenses start? Glasses with polycarbonate lenses were first developed in the 1980s,
Are High Index Lenses Aspheric? To make high index lenses even more attractive, most of them have an “aspheric” design. This means that, instead of having a round (or “spherical”) curve on the front surface, these lenses have a curve that gradually changes from the center of the lens to the periphery. Are aspheric lenses
How Do You Tell If Your Glasses Lenses Are Plastic Or Glass? All you need to do is tap a lens against your teeth, a tool that’s always available. If the lenses make a soft ringing sound, they are more likely to be glass. If they make a soft *thunk*, then they are definitely plastic.
Is Polycarbonate Lens Scratch-resistant? Though polycarbonate is an extremely impact-resistant material, polycarbonate eyeglass lenses can be easily scratched without a protective scratch-resistant coating. Which is more scratch-resistant glass or polycarbonate? Glass and polycarbonate can both become scratched, but polycarbonate is less scratch-resistant, making anti-scratch coatings popular among glasses wearers. Impact resistance: A lens with high
Do All Sunglasses Have Prop 65? If you’re living in California, you’ll see that all sunglasses have the Prop 65 warning. It means exposure to chemicals leading to cancer, congenital disabilities, and health hazards. But if you live outside the state, you’ll not see this caution. Sunglasses and other prescription glasses often contain a chemical.