Lenses, are they all the same? Are they really just a piece of plastic AND do glass lenses still exist? First of all, no, not all lenses are the same! When you’re picking out some new glasses, the frame style is just the beginning—what’s inside the frame matters just as much. However, how much do you know about all the different lens materials? Again, before I worked in optics, I had zero clue, like 95% of consumers, I just thought they are a piece of plastic.
Anyway, let’ dive in and let MGAM help you break down the different lens materials, their benefits, and what to consider when choosing the best option for your lifestyle and vision needs.
1. Plastic (CR-39) Lenses
What are they?
CR-39 plastic lenses are the original lightweight alternative to glass. They’re still widely used today, especially for everyday prescriptions.
Pros:
- Lightweight and comfortable
- Good optical clarity
- More affordable than many other options
- Less likely to shatter than glass
Cons:
- Thicker than high-index or polycarbonate for strong prescriptions
- Can scratch more easily without a protective coating
2. Polycarbonate Lenses
What are they?
Originally developed for astronaut helmet visors, polycarbonate lenses are now a top choice for anyone needing extra durability—kids, sports enthusiasts, and safety glasses wearers.
Pros:
- Extremely impact-resistant (great for active lifestyles and children)
- Thinner and lighter than standard plastic
- Built-in UV protection
- Less likely to shatter
Cons:
- Can scratch if not coated with anti-scratch layer
- Slightly less optical clarity compared to CR-39 or high-index lenses (though most people won’t notice)
3. High-Index Plastic Lenses
What are they?
High-index lenses are designed for stronger prescriptions, allowing lenses to be thinner and lighter than standard plastic.
Pros:
- Ultra-thin and lightweight, even for strong prescriptions
- More comfortable for all-day wear
- Stylish—less “bulky” appearance in your frames
Cons:
- More expensive than standard plastic or polycarbonate
- Can be more reflective, so an anti-reflective coating is recommended
4. Glass Lenses
What are they?
Glass lenses were once the standard for all glasses. They offer excellent optical clarity but are much less common today.
Pros:
- Superior optical clarity and scratch resistance
- Very durable (in terms of scratching)
Cons:
- Heavier than all plastic options
- Can shatter or chip more easily if dropped
- Not suitable for rimless or semi-rimless frames
- Usually more expensive
5. Trivex Lenses
What are they?
Trivex is a newer lens material similar to polycarbonate but with some unique advantages.
Pros:
- Very impact-resistant
- Lightweight
- Excellent optical clarity
- Built-in UV protection
Cons:
- Slightly thicker than high-index lenses for strong prescriptions
- Can be more expensive than standard plastic
How to Choose the Right Lens Material?
For everyday wearers: Standard plastic (CR-39) is a solid, affordable choice.
For active lifestyles or kids: Polycarbonate or Trivex is best for safety and durability.
For strong prescriptions: High-index lenses keep things thin, light, and comfortable.
For those who want the clearest vision: Glass is unbeatable for clarity, but keep weight and fragility in mind.
Don’t forget coatings!
One thing we strongly recommend is, no matter what the lens materials maybe always consider adding some kind of coating to ensure you are getting best out of your lens. It may not be possible to have everything and of course, the cost is a factor too but think about adding either anti-scratch, anti-glare, and UV coatings to get the most out of your lenses. I always go for anti- scratch myself.
Remember, your lenses are the real “workhorse” of your glasses—so it’s worth taking the time to choose the right material for your needs. I know very often lens materials are not discussed but if you want to know and find out more on what you are paying for then ask! Ask your optician for advice based on your prescription, lifestyle, and budget. The right lenses will help you see and feel your best, every day. My go to brand is Jai Kudo as they are reasonably priced and good quality compared to other big names on the market.