When it comes to choosing eyeglass lenses, there are a multitude of options available in the market. From high-index lenses to polycarbonate lenses and even glass lenses, the choices can be overwhelming. However, one type of lens that has stood the test of time in terms of popularity and versatility is the CR-39 lens.
CR-39, which stands for Columbia Resin #39, is a plastic polymer that has been widely used in the manufacturing of eyeglass lenses since its development in 1940. Also known as allyl diglycol carbonate (ADC), this thermosetting plastic was the 39th formula developed by the Columbia Resins project.
One of the biggest advantages of CR-39 lenses is their affordability. Compared to other types of lenses such as glass lenses or high-index lenses, CR-39 lenses are relatively cheap to produce. This makes them an ideal choice for those who are looking for a cost-effective solution for their eyewear needs.
Another advantage of CR-39 lenses is their durability. While they may not be as impact-resistant as polycarbonate lenses or as thin as high-index lenses, CR-39 lenses are still highly durable and can withstand everyday wear and tear. They are also scratch-resistant, making them a great choice for those who are concerned about the longevity of their eyewear.
In terms of optics, CR-39 lenses provide excellent clarity and are able to be easily tinted to provide additional protection from the sun. They also have a high Abbe value, which means that they provide clear and accurate vision without any distortions or aberrations.
Overall, CR-39 lenses are a great choice for those who are looking for a durable, affordable, and high-quality option for their eyewear needs. While they may not have some of the advanced features of other types of lenses, they are still a reliable and effective choice for everyday wear. So if you're in the market for new eyeglasses, consider asking your eye doctor about CR-39 lenses and see if they're right for you.