No lens is scratch-proof. What you can buy is a lens with a tougher surface, and the real differences come from the coating on top and from how you carry and clean the glasses. This guide compares the main options sold in Canada: standard hard coats, premium coatings, lens materials and the sunglasses question. It also covers the habit that does the most to protect any pair.
TL;DR
- Almost all modern lenses are plastic, and plastic needs a scratch-resistant hard coat. Check that yours has one.
- Polycarbonate is the most impact-resistant material, but it is not more scratch-resistant than other plastics. The coating decides that.
- Premium coatings such as Crizal Rock and ZEISS DuraVision Platinum are marketed as much tougher than basic coats. Brand claims come from the makers’ own testing, so treat them as a guide, not a guarantee.
- Mirror and flash lenses scratch more easily, so they need the most care.
- Storage causes more scratches than daily wear. A hard, compact case or pouch is the cheapest upgrade you can make.
Table of Contents
- Why lenses scratch in the first place
- Lens materials compared
- The coatings: from basic hard coat to premium
- Scratch-resistant sunglasses: what’s different
- What actually scratches lenses (and what protects them)
- Why storage matters more than you’d think
- Our perspective
- Choosing between your options
- Foldable frames from ROAV
- FAQ
- Sources
Why lenses scratch in the first place
Glass is naturally hard but heavy and more likely to shatter. Health Canada notes that most sunglasses are plastic, which is tougher and less likely to shatter than glass, and it recommends a scratch-resistant coating for these lenses. Plastic is lighter and safer, but its bare surface is soft. Grit in a pocket, a dry cloth on a dusty lens or a trip loose at the bottom of a bag will mark it.
Scratches are more than cosmetic. Small marks scatter light, which is most annoying when you drive into low sun or look at headlights at night. The Government of Canada’s workplace eye safety guidance says protective eyewear should be inspected daily and replaced if scratched, pitted, bent or broken, because that damage weakens the lens’s ability to resist impact. That advice is aimed at safety eyewear, but it shows how seriously a damaged surface is treated.
Lens materials compared
The material sets how thin, light and impact-resistant a lens is. It matters less for scratching than most people expect.
| Material | Impact resistance | Scratch resistance | Best for |
|---|---|---|---|
| Glass | Lower, can shatter | Naturally hard | Those who want maximum surface hardness and accept the weight |
| Standard plastic (CR-39) | Good | Needs a hard coat | Everyday prescription glasses |
| Polycarbonate | Highest | Needs a hard coat | Kids, sport, safety, active use |
| High-index plastic | Varies | Needs a hard coat | Strong prescriptions, thinner lenses |
The American Optometric Association’s review of spectacle-impact performance explains that polycarbonate is the most impact-resistant spectacle lens material but is not inherently more scratch-resistant than other plastics. Once coated, its abrasion resistance is comparable to other plastic lenses. So “polycarbonate” tells you the lens will survive a knock. It does not tell you the lens will resist scratches.
The same paper also reminds us that protection depends on the frame and the lens working together. A tough lens in a frame that bends or loosens is not durable eyewear.
The coatings: from basic hard coat to premium
Standard hard coat
A hard coat is a thin clear film on the lens surface. Canadian online retailers list it plainly: The Optical Shop describes its standard HC lens as a clear film that makes the lens much more scratch-resistant. Many retailers now include this as standard, not as an add-on. If a quote shows it as a paid extra, ask why. Most lenses ship with it.
Anti-reflective coatings with scratch protection
Anti-reflective (AR) coatings cut glare and reflections and are usually layered on top of a hard coat. Their durability varies a lot between tiers, and that is where the big brands compete.
- Essilor Crizal Rock. Essilor says it is 3x more scratch-resistant than its entry-level Crizal and also resists smudges. That is the manufacturer’s own comparison against its own base product.
- ZEISS DuraVision Platinum. ZEISS states in its guide to choosing a lens coating that lenses with DuraVision Platinum are up to three times harder than current-generation plastic lenses, based on its own studies.
- Store-brand coatings. Chains such as Warby Parker and New Look include a scratch-resistant coating in their lens packages. Their materials describe the benefit in general terms, with no head-to-head test data.
Optometrists often say that top-end coatings are close to each other in practice. A thread on the r/optometry forum reflects that view, with Crizal Rock mentioned as the newest one focused on scratch resistance. That is anecdotal. Ask your own optician what they stock and what warranty comes with it.
What it costs
There is no single Canadian price. Basic hard coats are often bundled in. Premium AR coatings add to the bill and vary by optician, lens material and prescription. Ask for an itemized quote that separates frame, lens material, hard coat and AR tier, and ask whether the coating has a scratch warranty and for how long. A lower sticker price that excludes coatings is rarely cheaper in the end.
Scratch-resistant sunglasses: what’s different
Sunglasses add three wrinkles.
Polarized and tinted lenses. The tint and polarizing layer sit inside or under the surface treatments, so a good hard coat still matters. Do not assume a dark lens is a tough lens.
Mirror and flash finishes. Health Canada says mirror and flash lenses, though stylish, often scratch more easily than standard lenses. If you love the look, plan on a case every time.
UV protection is separate. A scratch-resistant coating does not make a lens block UV, and the reverse is also true. Health Canada’s tips say a low-cost pair with UVB and UVA protection does the job for most people. So choose UV protection first and durability second.
If you shop abroad for deals, a roundup like this one on discounted sunglasses offers can help you compare styles, though it is UK-focused. Check Canadian shipping and duties before you buy.
What actually scratches lenses (and what protects them)
- Loose storage. Keys, coins and sand in bags and pockets. Fix: a case or pouch every time.
- Dry wiping. Dust acts like sandpaper. Fix: rinse with lukewarm water, add a drop of dish soap, then dry with a clean microfibre cloth.
- Shirt hems and paper towels. Fibres are coarse. Fix: keep a microfibre cloth in the case.
- Heat. A hot dashboard can damage coatings and cause crazing, where fine cracks appear. Fix: keep glasses out of a parked car in summer.
- Resting lenses-down. Fix: fold and put them away, or rest them on the temples.
The AOA review adds a useful caveat: coatings improve durability but do not replace proper care. Most scratches come from habits, so the most durable lens is the one that lives in a case.
Why storage matters more than you’d think
A hard material can still be scratched by something harder. Quartz, the main component of sand and common dust, is among the harder everyday minerals. That is why a gritty pocket or beach bag does so much damage to lenses. It also explains why watchmakers prefer sapphire crystal over mineral crystal for watch faces. This comparison of sapphire versus mineral crystal shows how surface hardness changes scratch behaviour. For eyewear, the plastic equivalent is a hard coat plus a protective case.
Our perspective
We make foldable sunglasses and eyeglasses, and we see scratches as a carrying problem as much as a coating problem. Most people who tell us their glasses are scratched did not damage them while wearing them. The damage happened in a bag, a jacket pocket, a glovebox or a gym locker, in a bulky case that stayed at home because it was too big to carry.
That is why our frames use a patented micro hinge that folds down to a very compact size. A pair that fits in a small pouch gets put away more often, and that habit does more for lens life than any coating chart. Every pair includes a waterproof pouch for that reason. The frames are also screwless, so there are no tiny screws to loosen with repeated folding, and the design is lightweight and durable.
Our advice on buying any eyewear is the same: choose UV protection first, then a lens with a proper scratch-resistant surface, then a case you will actually use. Check the lens details on the product page of the model you want, and ask us if something is unclear. Compare coatings by what the maker can show you, not by adjectives.
— Thomas
Choosing between your options
| If you are… | Look for | Why |
|---|---|---|
| Buying everyday prescription glasses | Hard coat plus a mid or premium AR coating, with a scratch warranty | Daily cleaning is the main wear |
| Buying for a child or for sport | Polycarbonate with hard coat | Impact is the main risk |
| Buying sunglasses for travel | Polarized UV-blocking lenses and a compact, protective case | Bags are the main threat |
| Choosing mirror or flash lenses | A case every time and soft cleaning | These finishes scratch more easily |
| On a tight budget | Standard hard coat, good care habits | Care beats expensive coatings |
Already own good frames with scratched lenses? A professional lens replacement is an option, since an optician can fit new lenses with coatings into your existing frame. Ask for a quote before you decide whether to replace or buy new.
Foldable frames from ROAV
If you carry your glasses through airports, hikes and commutes, a frame that folds small is the easiest way to keep the lenses safe. Browse our foldable sunglasses, our wider sunglasses collection or our prescription eyeglasses. Each pair has polarized UV protection, a screwless ultra-durable frame and a waterproof pouch. Companies looking for employee gifts can start from our storefront.
FAQ
Do glasses lenses get scratched easily?
Plastic lenses without a hard coat do. With a coating they hold up well in normal use, but grit and dry wiping will still mark them. Rinse first, wipe with microfibre and store them in a case.
Is it better to have glass or plastic lenses?
For most people, plastic. It is lighter and, per Health Canada, tougher and less likely to shatter. Glass is harder against scratches but heavier and more breakable.
Is polycarbonate scratch-resistant?
Not by itself. It is the most impact-resistant material, but its scratch resistance comes from the coating applied afterwards. Once coated, it performs about like other plastics.
How much does a scratch-resistant coating cost?
A basic hard coat is often included in the lens price. Premium AR coatings cost extra and the price depends on your optician and prescription. Ask for an itemized quote and the length of any scratch warranty.
Can a scratch be polished out?
No. Coated lenses cannot be reliably polished without removing the coating, which leaves the lens worse. If a scratch blocks your vision, have the lenses replaced.
Sources
- Sunglasses, Health Canada
- Protect Your Eyes!, Government of Canada
- Spectacle-related eye injuries, spectacle-impact performance and eye protection, American Optometric Association
- Crizal Rock, Essilor Canada
- Ten tips for choosing the right lens coating, ZEISS Canada
- Which is most scratch resistant lens brand, r/optometry