The Benchmark of the Optical Industry. Since its discovery in 1947 by the Columbia Resins project, CR-39 (Allyl Diglycol Carbonate) has remained the gold standard for visual acuity in plastic optics.
While newer high-index materials offer thinner profiles, CR-39 retains a cult status among optometrists and luxury fashion brands for two specific reasons: its glass-like optical quality (Abbe Value 58) and its superior tintability. At Jings Eyewear, we utilize premium ADC monomers to cast lenses that offer the perfect balance of performance and aesthetics.
-------------- Optical Performance Analysis ---------------
In the world of optics, Abbe Value defines a material's dispersion—how much it splits white light into rainbows (chromatic aberration). Higher numbers mean clearer vision.
For users with low prescriptions, CR-39 offers the most natural, distortion-free visual experience available in a polymer format. It virtually eliminates the "rainbow effect" often seen in the peripheral vision of polycarbonate lenses.
-------------- Fashion & Tinting Capabilities ---------------
Unlike polycarbonate, which requires complex surface treatments to accept color, CR-39's molecular structure allows pigments to penetrate deep into the lens matrix.
-------------- Technical Specifications ---------------
| Property | CR-39 Specification | Benefit |
|---|---|---|
| Refractive Index | 1.499 | Cost-effective, standard thickness |
| Abbe Value | 58 | Superior optical clarity, low fatigue |
| Specific Gravity | 1.32 g/cm³ | Half the weight of mineral glass |
| Heat Resistance | ~100°C | Excellent for AR coating application |
CR-39 is not injection molded. It is created through a thermal curing casting process. The liquid monomer is poured into precise glass molds and cured in ovens for up to 20 hours.
Why this matters: This slow curing process results in a lens with minimal internal material stress. This stress-free structure is why CR-39 is less likely to warp in frames and why it provides such stable optical performance compared to mass-produced injection lenses.
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