Plastic vs Polycarbonate Lenses: Which is Best for You?

If you wear glasses, you may own a pair and be wondering which lens material you should opt for: plastic or polycarbonate? You may be wondering about the differences between the two, as both are very popular and common lens materials. In this guide, we'll take a close look at both lenses, listing their pros and cons, as well as the best uses for each. Hopefully, this will help you make an informed decision.

What Are Plastic (CR-39) Lenses?

CR-39, or plastic lenses, have been the most popular glasses lenses since the 1940s. They are made of plastic resin mixed with allyl diglycol carbonate, which makes them lightweight. They are inexpensive and thus are the common choice for many eyewear users.

Pros and Cons of Plastic Lenses

Plastic lenses offer the following benefits:

• Optical clarity: provides crystal clear vision with no distortion.
• Cost: is inexpensive, therefore remaining within the budget of most people.
• Durability: fairly durable, though not as strong as other materials.

Plastic lenses also have drawbacks:

• Thickness: quite thicker than other materials. If you have a stronger prescription, your glasses may look aesthetically unappealing.
• Impact resistance: less impact-resistant and can break.
• UV protection: Features no built-in UV protection.

What Are Polycarbonate Lenses?

Polycarbonate lenses were introduced in the 1970s for use in safety glasses. As thermoplastic materials, polycarbonate lenses are highly impact resistant; this makes them exceptionally suitable for active people and young children. They also feature UV protection, which supports eye health.

Pros and Cons of Polycarbonate Lenses

Polycarbonate lenses have several advantages.

• Weight: They are considerably lightweight, about 25% lighter than traditional plastic.
• Thinness: Are quite thin,
• Impact resistance: Highly impact-resistant and don’t shatter easily
• UV protection: Features built-in UV protection.

Disadvantages of polycarbonate lenses are:

• Visual clarity: offers slightly less clarity, may cause visual distortion
• Wear and tear: prone to scratches without coatings.
• Cost: They are more expensive than plastic.

Plastic vs Polycarbonate Lenses: Key Differences

Based on the table above on polycarbonate vs. plastic lenses, plastic lenses offer excellent visual clarity and scratch resistance. They are also cheaper but are moderately impact resistant and don’t feature UV protection. Polycarbonate lenses are thinner, highly impact-resistant, lighter, and generally more expensive but need a scratch-resistant coating. Polycarbonate’s thin profile makes it ideal for strong prescriptions and comfortable for people who wear glasses for a long time.

When to Choose Plastic Lenses

You may choose plastic lenses:

• If you have a lower prescription, plastic is thicker and would not suit people with a strong prescription, since they would then need thicker glasses.
• If you are on a budget, then plastic is the cheapest option of all. Best indoors since it can easily break or shatter when struck.
• If you want a clear vision, plastic is the best.

Example: If you need glasses for reading and don’t need impact resistance, CR-39 is a cost-effective choice.

When to Choose Polycarbonate Lenses

You may choose polycarbonate lenses:

• For kids, as they tend to break their glasses. Polycarbonate doesn’t break that easily.
• The same goes for athletes or individuals who are into sports. They need durable glasses.
• Polycarbonate is durable, and it is considered to be an appropriate material for making safety glasses for people who will be working in a laboratory or industrial environment.
• Polycarbonate is thinner and therefore suitable for persons with moderate to strong prescriptions.

Example: Polycarbonate is great for kids and athletes due to its durability.

Cost Comparison: Plastic vs Polycarbonate

Plastic lenses are the most affordable option. They are at least 20-30% less expensive than polycarbonate lenses. But they don’t feature UV protection and related features. So while polycarbonate lenses may cost you more initially, with added features like UV protection, the extra cost can well be justified.

You must note that the prices vary based on coatings. For instance, if you consider anti-glare, blue-light filtering, or anti-reflective options, the cost would definitely increase, and vice versa.

Conclusion

When deciding on the type of glass lenses to select, a few variables can be compared between plastic glasses and polycarbonate glasses. While polycarbonate lenses are stronger in terms of durability and spectroscopic safety, plastic lenses are stronger in terms of visual clarity and cost. You have the freedom to decide! Ready to pick your lenses? Visit ZEELOOL or consult your optometrist to find the perfect fit.

FAQ

What is the difference between plastic and polycarbonate lenses?

The main differences are in the clarity, durability and price. Plastic (CR-39) lenses offer excellent optical clarity and are the more affordable option but are thicker, heavier and have no built-in UV protection. Polycarbonate lenses are about 25% lighter, significantly more impact-resistant, and include UV protection as standard — but they cost more and can show slight visual distortion compared to CR-39. For most everyday low-prescription wearers on a budget, plastic works well; for kids, athletes, or stronger prescriptions, polycarbonate is the more practical choice.

Are polycarbonate lenses worth it?

For the right person, yes. If you have an active lifestyle, children who go through glasses quickly, or a moderate-to-strong prescription where thinner and lighter lenses make a noticeable difference, polycarbonate is genuinely worth the extra cost. The built-in UV protection also means you're not paying separately for that coating. Where it's less necessary is for straightforward indoor reading glasses or very low prescriptions, where the extra durability and thinness don't make a meaningful practical difference.

Are polycarbonate lenses scratch resistant?

Not inherently — this is one of the trade-offs with polycarbonate. It is softer than CR-39 plastic and therefore more prone to surface scratching unless a protective coating is used. Most polycarbonate lenses come with a scratch-resistant coating applied, but it's worth confirming this when ordering. If you're particularly hard on your glasses, an anti-scratch coating is an important add-on regardless of which lens material you choose.

Which is better for kids — plastic or polycarbonate lenses?

Polycarbonate is the clear recommendation for children. Kids are harder on glasses than most adults, and polycarbonate's high impact resistance means the lenses are much less likely to shatter or crack during everyday wear and the occasional drop or collision. The built-in UV protection is an added benefit given that children accumulate most of their lifetime UV exposure before age 18. The slightly higher cost is usually worth the durability trade-off for younger wearers.

Do polycarbonate lenses have UV protection?

Yes, UV protection is built into polycarbonate lenses as a standard property of the material itself — you don't need a separate UV coating added on top. Standard plastic (CR-39) lenses don't have this inherent UV protection and would require an additional coating to provide the same coverage. For outdoor wear or for children who spend significant time in the sun, polycarbonate's built-in UV protection is one of its most practical advantages over standard plastic.