Saturday, 28 February 2015

Lens Material Options for ADVENTURE


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Eyeglass Lens Materials Option
Here are popular eyeglass lens materials, arranged in order of refractive index and lens thickness (pretty good indicators of cost). Except for the crown glass, these are all plastic materials.
Lens MaterialRefractive IndexAbbe ValueKey Features and Benefits
High-index plastics1.70 to 1.7436 (1.70)
33 (1.74)
The thinnest lenses available.
Block 100 percent UV.
Lightweight.
High-index plastics1.60 to 1.6736 (1.60)
32 (1.67)
Thin and lightweight.
Block 100 percent UV.
Less costly than 1.70-1.74 high-index lenses.
Tribrid1.6041Thin and lightweight.
Significantly more impact-resistant than CR-39 plastic and high-index plastic lenses (except polycarbonate and Trivex).
Higher Abbe value than polycarbonate.
Downside: Not yet available in a wide variety of lens designs.
Polycarbonate1.58630Superior impact resistance.
Blocks 100 percent UV.
Lighter than high-index plastic lenses.
Trivex1.5445Superior impact resistance.
Blocks 100 percent UV.
Higher Abbe value than polycarbonate.
Lightest lens material available.
CR-39 plastic1.49858Excellent optics.
Low cost.
Downside: thickness.
Crown glass1.52359Excellent optics.
Low cost.
Downsides: heavy, breakable.

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