plastic

CR-39 lenses, also known as plastic lenses, are made from a lightweight plastic material called allyl diglycol carbonate. These lenses are less impact-resistant compared to polycarbonate lenses but offer excellent optical clarity. CR-39 lenses are commonly used in prescription eyeglasses as they can be easily customized to fit individual vision needs.

Plastic eyewear lenses can also be coated with various treatments to enhance their performance. For instance, anti-reflective coatings can reduce glare and improve visual clarity, while UV coatings can block harmful ultraviolet rays from the sun.

Overall, plastic eyewear lenses provide a cost-effective and practical solution for vision correction and eye protection. They are widely used in the eyewear industry due to their versatility, durability, and affordability.