Is CR-39 A polycarbonate?
Polycarbonate Lens Impact Test An alternative material to polycarbonate is CR39 (Columbia Resin 39), a plastic polymer commonly used in the manufacture of eyeglass lenses. Unlike polycarbonate, CR39 requires a UV coating to be added to protect eyes from the sun’s harmful rays.
Are CR-39 lenses good?
That is where CR-39 lenses (Wikipedia link) improve on glass. It’s optical quality is almost as good as glass (and far better than all the other options we will look at), it is half as heavy as glass, it is much more resistant to shattering, and still very resistant to scratches.
Which is better plastic or polycarbonate lenses?
Greater Protection: Polycarbonate lenses do not break or shatter easily into harmful pieces on impact. These eyeglass lenses are also thinner making it less heavy than standard plastic or glass lenses. Inherent Ultraviolet (UV) protection: Polycarbonate lens surfaces offer inbuilt ultraviolet protection.
Is polycarbonate more scratch-resistant than plastic?
10 times more resistant to impact than plastic eyeglasses, so they don’t shatter or break as easily. Boast scratch resistance so they last longer than regular plastic lenses. The refractive index of polycarbonate lenses is 1.59, which means that they tend to be 20 to 25 percent thinner than plastic eyeglasses.
Are polycarbonate lenses better?
Thinner and lighter than plastic, polycarbonate (impact-resistant) lenses are shatter-proof and provide 100% UV protection, making them the optimal choice for kids and active adults. They’re also ideal for strong prescriptions since they do not add thickness when correcting vision, minimizing any distortion.
Does polycarbonate block UV?
This can include cataracts and macular degeneration, along with other eye problems. Luckily, polycarbonate lenses already block out harmful UV rays from the sun. And, unlike some other types of eyeglass lenses, they do not require any additional coating for sun protection.
Is it worth getting polycarbonate lenses?
Polycarbonates lenses are worth it. They’re durable and impact-resistant, lightweight and thin, and even offer extremely effective UV protection. Considering their price and the many pros that come with polycarbonate lenses, they are definitely worth it in both the long run and short term.
