For most impact-focused, budget and children’s eyewear, polycarbonate is the practical choice; for athletes and wearers who prioritize optical clarity, optical-grade nylon (polyamide) is often the better pick. The gap comes down to Abbe value and how each material passes impact-resistance testing, and coatings can change the outcome either way. This article was written from a vantage point in eyewear design.
TL;DR:
- Optical-grade nylon provides significantly better optical clarity with higher Abbe values, reducing chromatic aberration and color fringing at the lens edges.
- Polycarbonate’s impact resistance is standard, but its softness on its own makes it reliant on coatings; coatings can diminish impact resistance, especially if safety testing isn’t confirmed post-coating.
- Impact safety for coated lenses depends on whether the finished, coated product was tested, as coatings can alter impact performance compared to uncoated raw materials.
- For children, sports, and impact-prone activities, polycarbonate remains the recommended, lower-cost, impact-resistant option, with impact-tested coatings essential for safety assurance.
- Optical-quality nylon lenses tend to be pricier but offer lighter weight, better scratch resistance, and less chromatic aberration, making them ideal for high prescriptions or athletes sensitive to visual clarity.
Table of Contents
- Nylon vs polycarbonate at a glance
- Optical clarity, Abbe value and refractive index explained
- Impact resistance, safety standards and what coatings change
- Scratch resistance and long-term durability
- How to pick the right lens material for your needs
- How ROAV Eyewear approaches lens material
- When material choice really matters
- Try ROAV lenses built for travel and everyday wear
- Sources
- FAQ
Nylon vs polycarbonate at a glance
Both materials do the same basic job: they hold a prescription or tint, resist breaking, and block UV. Where they diverge is in how clean the image looks, how light the frame feels, and how each responds to scratches and chemicals.
- Best for: polycarbonate suits children, sports where a hard hit is likely, and everyday budget frames.
Optical-grade nylon suits athletes, high prescriptions and wearers sensitive to colour fringing.
- Impact resistance: both meet standard drop-ball testing when uncoated, but coatings can change the result on either material.
- Optical clarity: nylon’s higher Abbe value means less chromatic aberration and a cleaner image at the lens edges.
- Weight: nylon lenses run lighter for a given lens power, which matters most in larger or wraparound frames.
- Scratch resistance and coatings: polycarbonate is softer on its own and depends heavily on a hardcoat; nylon holds up better against solvents and long-term clouding.
- Price: polycarbonate is the everyday, lower-cost option; optical-grade nylon usually carries a premium tied to its optical performance.
Polycarbonate typically measures an Abbe value near 30, while optical-grade nylon lenses fall in the 52 to 56 range. That spread is the single biggest reason sports and premium optics brands lean toward nylon when clarity is the priority. Look for materials branded TROGAMID® or labelled “optical-grade nylon” or “optical-grade polyamide” on premium lenses, and standard polycarbonate specs (refractive index near 1.586) on everyday frames.
Optical clarity, Abbe value and refractive index explained
Abbe value measures how much a material bends different wavelengths of light differently, a property called dispersion. A low Abbe value means more dispersion, which shows up as colour fringing (chromatic aberration) at the edges of a lens, particularly in wraparound or high-power frames. Polycarbonate’s Abbe value sits around 30, while optical-grade nylon reaches 52 to 56, a difference manufacturers describe as cutting chromatic aberration by roughly 73%.
Refractive index is a separate property: it determines how much a material bends light overall, which controls lens thickness. Polycarbonate’s refractive index of about 1.586 lets manufacturers make thinner lenses than older materials like standard plastic, without needing exotic grinding. That thinness matters cosmetically and for weight, but it doesn’t address dispersion the way a higher Abbe value does.
For most casual wearers, the practical effect of a lower Abbe value is subtle. For wearers with strong prescriptions, or for athletes tracking a fast-moving ball or a trail edge in bright light, chromatic aberration is more noticeable: colours can separate slightly at the lens periphery, and edges look less crisp during quick head movement. That’s the scenario where optical-grade nylon’s Abbe advantage earns its price premium, and where a budget polycarbonate lens can feel noticeably softer at the edges by comparison.
Impact resistance, safety standards and what coatings change
In many countries, spectacle lenses must pass a drop-ball impact test before sale, and the FDA’s guidance on impact-resistant lenses lays out the requirements under 21 CFR 801.410. Passing that test as a raw lens blank is not the end of the story: once a lab applies an anti-reflective or hard coating, the finished lens becomes a different product, and the FDA guidance notes that finished, coated lenses may need to be retested because the coating changes how the lens absorbs impact.
Polycarbonate has a long history in safety and children’s eyewear because it inherently blocks nearly all UVA and UVB and holds up well to sudden impact. AOA guidance recommends polycarbonate or Trivex for children’s sunwear specifically because of that impact resistance combined with natural UV absorption, without needing an added UV coating.
The catch applies to both materials. Published testing summarized by OpticianWorks shows that anti-reflective coatings and some hardcoats can reduce impact resistance substantially compared to an uncoated lens, sometimes enough to change how the lens performs in a drop-ball scenario. If safety is the deciding factor in your purchase, ask the retailer or lab whether the finished, coated lens (not just the raw material) was tested to the relevant standard.
Scratch resistance and long-term durability
Untreated polycarbonate is a relatively soft plastic and scratches more easily than glass or nylon on its own. That’s why almost every polycarbonate lens on the market ships with a factory hardcoat: once coated, polycarbonate’s abrasion resistance can match or approach other lens plastics. Skip the hardcoat and you’ll see fine scratches accumulate within months of regular wear.
Optical-grade nylon brings a different strength: it resists chemical stress cracking better than polycarbonate over time, which shows up as fewer micro-cracks and less clouding after years of exposure to sunscreen, saltwater or cleaning solvents. That’s part of why TROGAMID®-based lenses are marketed for premium sports use, where sweat and sunscreen contact is constant.
A few habits protect either material:
- Rinse lenses with water before wiping to avoid grinding in sand or salt.
- Use a microfibre cloth and avoid paper towels, which can leave fine scratches.
- Ask for a reputable, name-brand hardcoat rather than an unlisted generic coating.
Pro Tip: If you’re comparing two lenses that look identical on the shelf, ask which hardcoat brand was used, since the coating often affects scratch resistance more than the base material does.
How to pick the right lens material for your needs
Match your main use case to the material before worrying about brand or price.
- Choose polycarbonate if you’re buying for a child, a contact sport with a real risk of impact, or you want a reliable everyday pair without a premium price.
- Choose optical-grade nylon if you’re an athlete tracking fast motion, you have a strong prescription, or you’re sensitive to colour fringing at the edge of your vision.
- Ask about the Abbe value or an “optical-grade” designation on the product page or from the retailer; a lens marketed only by tint and frame colour is telling you nothing about optical performance.
- Confirm which coatings are factory-applied and whether the finished, coated lens was impact-tested, not just the raw blank.
- Expect to pay more for nylon when the clarity gain matters to you; for casual, everyday use, polycarbonate’s lower price is usually the better trade.
How ROAV Eyewear approaches lens material
Foldable frames add a constraint that flat-lens design doesn’t face: every gram and every millimetre of lens thickness affects hinge stress over thousands of fold cycles. That’s part of why lens weight and thinness matter as much as raw toughness when a frame needs to collapse down repeatedly without loosening at the hinge, a factor covered in more detail in our guide to durable foldable sunglasses. You can check current lens specifications on the DEVON Black+Onyx | Clear, LENNOX Gunmetal | Silver and LENNOX Black | Light-Blue product pages, each part of our foldable sunglasses lineup.
When material choice really matters
Most everyday wearers won’t notice the difference between polycarbonate and nylon, and that’s fine: polycarbonate’s price and impact resistance make it the sensible default. The choice only really matters once you’re an athlete, a high-prescription wearer, or someone buying for a child’s safety, at which point the checklist above, and a straight question about coatings, should decide it.
— Thomas
Try ROAV lenses built for travel and everyday wear
ROAV pairs foldable convenience with UV protection across a range of lens and frame choices, so you’re not stuck picking between compact carry and the clarity you actually want to look through.
- Browse the DEVON Black+Onyx | Clear for a compact everyday option.
- Check the LENNOX Gunmetal | Silver and LENNOX Black | Light-Blue styles side by side.
- Shop the full Sunglasses and Foldable Sunglasses collections, or explore Eyeglasses if you need a prescription pair.
If you’re weighing UV protection against polarization on top of lens material, our piece on UV protection versus polarized lenses walks through that decision too, and our guide to choosing travel sunglasses covers weight and fold considerations in more depth. Cyclists and other outdoor athletes comparing broader sun-protection needs may also find this layered sun-protection guide for cyclists useful alongside your lens choice.
Sources
- Impact-resistant lenses: questions and answers | FDA
- Light and eye damage (AOA guidance)
- High performance nylons for optical applications (Evonik/TROGAMID®)
- FUTR LenZ™ by ZEISS | Advanced lens technology for performance eyewear – Zirkel Optics
FAQ
What are the downsides of using polycarbonate lenses?
Polycarbonate’s main downside is optical clarity: its lower Abbe value around 30 means more chromatic aberration than optical-grade nylon at 52 to 56. It’s also softer without a hardcoat, so scratch resistance depends heavily on the coating quality applied.
What’s the best lens material for glasses?
There’s no single best material for every wearer: polycarbonate suits safety, sports impact and budget needs, while optical-grade nylon suits wearers who prioritize clarity and lighter weight. The right choice depends on your prescription strength, activity level and how much colour fringing bothers you.
Is it worth getting polycarbonate lenses?
Yes, for most everyday wear, children’s eyewear and impact-prone sports, polycarbonate remains a sound, affordable choice backed by a long safety record. AOA guidance specifically recommends it for children because of its impact resistance and natural UV blocking.
What lenses are better than polycarbonate for clarity?
Optical-grade nylon, sometimes branded as TROGAMID® or marketed under names like FUTR LenZ, offers a higher Abbe value and less chromatic aberration than polycarbonate. Manufacturer specifications describe this nylon at Abbe 52 to 56, against roughly 30 for standard polycarbonate.