CR-39 lenses are a popular choice for eyewear due to their lightweight and durable nature. This guide explores everything you need to know about CR-39 lenses, from their benefits to how they compare with other lens materials.
As one of the most commonly used materials in prescription eyeglasses, CR-39 has stood the test of time. Whether you’re a first-time buyer or an optician, understanding these lenses can help you make informed decisions about your eyewear needs.
In this article, we’ll discuss the key features, advantages, and considerations when choosing CR-39 lenses. We’ll also provide insights into where to buy them and how to find the right fit for your lifestyle.
What Are CR-39 Lenses?
Definition of CR-39 Lenses
CR-39 lenses are a type of plastic used in eyeglass lenses. They are known for being lightweight, durable, and offering excellent optical clarity. These lenses are made from a resin called Columbia Resin 39, which was developed during World War II. It has since become one of the most commonly used materials in optical lenses due to its affordability and practicality.
History and Development of CR-39 Lenses
CR-39 was developed by PPG Industries in the 1940s as part of the effort to create a safer and lighter alternative to glass lenses. Over time, its popularity grew due to its unique combination of being lightweight, impact-resistant, and offering superior optical clarity. By the 1950s, CR-39 lenses became the standard in eyewear, and today, they are still widely used in both prescription glasses and sunglasses.
Benefits of CR-39 Lenses
CR-39 lenses are much lighter than glass lenses, making them more comfortable for everyday wear. This feature is particularly beneficial for people with stronger prescriptions, as it helps reduce the weight of the lenses and the pressure on the nose and ears.（source：www.fda.gov）
Durability and Scratch Resistance
Although CR-39 is not as scratch-resistant as materials like polycarbonate, it still offers good durability. With proper care and the addition of anti-scratch coatings, CR-39 lenses can last for a long time without showing significant wear and tear.
Affordability
One of the main benefits of CR-39 lenses is their affordability. Compared to materials like high-index or polycarbonate, CR-39 lenses tend to be less expensive, making them an ideal choice for those on a budget who still want high-quality lenses.
Optical Clarity
CR-39 lenses are known for their excellent optical clarity. The material provides clear, crisp vision without the distortion that can sometimes be found in cheaper lens materials. This makes them a great option for people who require high levels of visual precision.
How CR-39 Lenses Compare to Other Lenses?
CR-39 vs Polycarbonate Lenses
| Feature | CR-39 Lenses | Polycarbonate Lenses |
|---|---|---|
| Weight | Lightweight | Lighter |
| Impact Resistance | Moderate (less than polycarbonate) | Higher impact resistance |
| Scratch Resistance | Lower (requires additional coatings) | Higher (can be further enhanced with coatings) |
| Optical Clarity | Excellent (high optical clarity) | Good (slightly less than CR-39) |
| Best Use Case | Everyday wear, suitable for standard eyeglasses | Children’s glasses, sports eyewear, safety glasses |
| Cost | Affordable | More expensive |
CR-39 vs High-Index Lenses
| Feature | CR-39 Lenses | High-Index Lenses |
|---|---|---|
| Target Audience | Suitable for moderate prescriptions | Suitable for high prescriptions |
| Thickness | Thicker (especially for high prescriptions) | Thinner, ideal for strong prescriptions |
| Weight | Slightly heavier (compared to high-index) | Lighter |
| Impact Resistance | Moderate (relatively more fragile) | Higher (especially with certain high-index materials) |
| Price | Affordable | More expensive (higher-index lenses generally cost more) |
| Optical Clarity | Excellent (suitable for most users) | Excellent (especially for high prescriptions) |
Popular Uses for CR-39 Lenses
Single Vision Lenses
CR-39 lenses are commonly used in single vision eyeglasses, providing a clear and lightweight solution for those who need vision correction for one field, either near or far.
Bifocal and Progressive Lenses
These lenses can also be used in bifocals and progressive lenses, offering the added benefit of combining multiple prescriptions into one pair of glasses without visible lines, providing comfort and clarity for users with presbyopia.
Fashion Frames and Prescription Eyewear
CR-39 lenses are a popular choice for fashion frames due to their ability to be easily shaped and tinted. They are also a preferred option for prescription eyewear because of their lightweight and optical clarity.
How to Choose the Right CR-39 Lenses?
Factors to Consider When Selecting CR-39 Lenses
When selecting CR-39 lenses, consider the prescription strength, the weight of the lens, the required coatings, and the frame size. It’s also important to evaluate whether you need single vision or multifocal lenses.
Prescription Strength and Frame Size
For stronger prescriptions, you may want to opt for lenses with a higher index of refraction. Additionally, the frame size should complement the lens thickness to ensure comfort and visual clarity.
Lens Coatings (e.g., Anti-Reflective, UV Protection)
Anti-reflective coatings can reduce glare and improve visual clarity, while UV protection coatings help shield your eyes from harmful UV rays. These coatings are especially beneficial for people who spend a lot of time outdoors.
Cost of CR-39 Lenses
Price Range for CR-39 Lenses
CR-39 lenses are generally affordable, with prices ranging from $30 to $100, depending on prescription strength and added coatings. For those on a budget, they offer a great balance between quality and price.
CR-39 vs Other Lens Materials: A Cost Comparison
Compared to polycarbonate and high-index lenses, CR-39 tends to be more affordable. Polycarbonate lenses can range from $50 to $150, and high-index lenses can cost upwards of $150, making CR-39 a more economical choice for those with less complex prescriptions.
Recap of the Benefits of CR-39 Lenses
CR-39 lenses offer an exceptional combination of lightweight durability, optical clarity, and cost-effectiveness, making them an ideal choice for eyewear solutions. Whether for single vision, bifocal, or progressive lenses, CR-39 provides a versatile foundation for various lens types. In addition to their affordability, these lenses offer long-lasting performance with proper care, making them an excellent choice for both consumers and optical businesses seeking high-quality yet economical lens options.
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