Lens Materials Guide: Choosing the Perfect Lenses for Your Needs
When selecting a new pair of eyeglasses, choosing the right frame is only part of the journey. The lens material you select has a major impact on comfort, clarity, durability, and overall visual performance.
This guide explains the most common lens materials, what makes them different, and which one may be the best choice for your lifestyle.
What Does the Refractive Index Mean?
All lenses correct vision by bending (refracting) light.
The refractive index tells you how effectively a lens material bends light.
Higher refractive index = bends light more efficiently = lenses can be thinner and lighter
Lower refractive index = bends light less = lenses need more material and appear thicker
Example for the same prescription strength:
• Low-index lens: thickest
• Mid-index lens: medium thickness
• High-index lens: thinnest and lightest
This is especially helpful for people with strong prescriptions, who benefit the most from thinner, high-index materials.
Common Lens Materials
1. Standard Plastic (CR-39)
Lightweight, affordable, and ideal for mild prescriptions.
• Best for: Low prescriptions (±0.25 to ±2.50)
• Pros: Comfortable, clear, budget-friendly
• Cons: Thicker and less impact-resistant than advanced materials
2. Polycarbonate
A popular choice for its durability and built-in impact resistance.
• Best for: Children, active lifestyles, safety eyewear
• Pros: Thin, lightweight, impact-resistant, UV protection
• Cons: Slightly less scratch-resistant without coatings
3. Trivex
Similar to polycarbonate but offers clearer optics and lighter weight.
• Best for: Anyone wanting both clarity and durability
• Pros: Ultra-light, impact-resistant, crisp optics
• Cons: Slightly more expensive than polycarbonate
4. 1.67 High-Index Lenses
Thinner and lighter than standard materials, ideal for stronger prescriptions.
• Best for: Moderate to strong prescriptions (±3.00 to ±6.00)
• Pros: Slim profile, comfortable for everyday wear
• Cons: Higher price compared to standard plastic
5. 1.74 Ultra High-Index Lenses
The thinnest material available for the highest level of prescription strength.
• Best for: Strong prescriptions (above ±6.00)
• Pros: Thinnest, lightest option for high power
• Cons: Premium cost, slightly less impact-resistant
Which Lens Material Should You Choose?
Your ideal material depends on:
• Your prescription strength
• Your daily activities
• Your preference for thinness and weight
• Durability and lifestyle needs
General recommendations:
• Low prescriptions: Standard plastic or polycarbonate
• Moderate prescriptions: Polycarbonate or 1.67 high-index
• High prescriptions: 1.67 or 1.74 high-index
• Kids / sports: Polycarbonate or Trivex for safety
Ready to Choose Your Lenses?
Now that you understand lens materials and refractive index, explore Mafami’s selection of eyewear and customize your lenses for clarity, comfort, and style.