Eyeglass Lens Materials – Features and Benefits
Plastic lenses: light weight, low cost
Polycarbonate lenses: “bulletproof glass”, more impact-resistant than CR-39 plastic, preferred material for children’s eyewear, safety glasses and sports eyewear.
High-index plastic lenses: thinner, lighter plastic lenses, the higher the index, the thinner and lighter the lenses are.
- 1.56 mid index
- 1.60 hi index
- 1.67 hi index
- 1.74 hi index
Eyeglass Lens Treatments
Anti-scratch coating: for adequate lens durability.
Anti-reflective coating: eliminates reflections in lenses that reduce contrast and clarity, especially at night.
UV-blocking treatment: protects eyes from UV
Photochromic treatment: enables eyeglass lenses to darken automatically in response to the sun’s UV and high-energy visible (HEV) light rays, and then quickly return to clear (or nearly clear) when indoors.