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Product Introduction
The Gold Standard of Optical Clarity: CR-39 Technology
Developed originally in the 1940s, CR-39 (Columbia Resin #39) remains the benchmark for optical purity in the ophthalmic industry. With an exceptionally high Abbe Value of 58, these lenses offer the lowest level of chromatic aberration available, ensuring that wearers experience crisp, edge-to-edge vision without the "color fringing" common in higher-index materials. Our 1.50 index lenses are cast using high-purity allyl diglycol carbonate monomer, resulting in a lens that is half the weight of traditional crown glass while providing significantly better impact resistance. This material is particularly favored for patients with low-to-moderate prescriptions who prioritize visual comfort and budget. One of the standout features of CR-39 is its exceptional tintability; the molecular structure allows for deep, uniform absorption of dyes, making it the preferred choice for custom sunglasses and therapeutic tints. Furthermore, our 1.50 series is treated with a reinforced hard coat (HC) that bridges the gap between the natural scratch resistance of glass and the lightweight benefits of plastic. For everyday use where extreme thinness is not the primary concern, the 1.50 CR-39 lens offers a level of transparency and optical integrity that high-index resins simply cannot match.
Specification
| Refractive Index | 1.499 / 1.50 |
| Abbe Value | 58 (Ultra-High Clarity) |
| Density | 1.32 g/cm³ |
Technological Highlights: Premium Monomers and Coating Integrity
- High-Purity Monomer Selection: We exclusively use high-performance monomers (e.g., MR-series) to achieve superior tensile strength and optical purity, resulting in excellent clarity and minimal risk of yellowing over time.
- Precision Liquid Casting Process: The lenses are produced via a controlled liquid casting method that ensures uniform material density and refractive index consistency across the entire blank, which is critical for accurate therapeutic power zones.
- Advanced Vacuum Multi-Coating (SHMC): Coatings are applied in a high-vacuum chamber, using multiple layers of metallic oxides to create a durable, anti-reflective stack. This process guarantees maximum light transmission and minimal glare.
- Thermal Curing Optimization: A slow and precise thermal curing cycle is employed to maximize the material’s resistance to internal stress, ensuring the finished lens remains stable and optically perfect under varying temperature conditions.
- Integrated Peripheral Defocus Geometry: The therapeutic design is engineered into the mold itself for cast lenses, or applied via digital surfacing for semi-finished blanks, guaranteeing the accuracy and consistency of the myopia control zone geometry.
Application
- Low-to-Moderate Prescriptions
- Custom Tinted Sunglasses
- Children's First Eyewear
Advantage
- Superior Optical Purity
- Excellent Scratch Resistance
- Most Cost-Effective Solution
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Customization
Customized For Your
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Complete Customization Capability
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Professional Lens Architecture
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Functional Coating Customization
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Digital Rx Customization
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Branding & Packaging
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Delivery & Support
FAQ
- Q: Why is 1.50 considered the clearest?
- A: It has the highest Abbe value, meaning it has the least chromatic aberration.
- Q: Is CR-39 suitable for high powers?
- A: It is best for lower powers, as it becomes quite thick for high prescriptions.
- Q: Can these be tinted?
- A: Yes, CR-39 is the easiest material to tint to any specific color.
- Q: Are they UV protected?
- A: Yes, they include integrated UV380 or UV400 protection.
- Q: Do they scratch easily?
- A: No, they have a naturally hard surface, further enhanced by our coatings.
- Q: Are they heavier than glass?
- A: No, they are approximately 50% lighter than mineral glass.
- Q: Can I use them in rimless frames?
- A: It is not recommended as the material can be brittle at the drill points.
- Q: Does the lens turn yellow?
- A: No, our high-purity monomers ensure long-term clarity.
- Q: Is anti-reflective coating available?
- A: Yes, we offer them with SHMC and Blue-Cut options.
- Q: What is the lead time for stock lenses?
- A: Stock orders usually ship within 3-5 business days.
Payment and Shipping Policy
- Payment: T/T, L/C, Western Union, or secure online portals. Standard 30% deposit for bulk production.
- Shipping: Global air/sea logistics via DHL, FedEx, or specialized freight forwarders. FOB/CIF terms available.
- Packaging: Sealed individual moisture-proof lens envelopes in reinforced export cartons.
Comprehensive Business Information
| MOQ | 100 Pairs (Finished) / 200 Pairs (Semi-finished) |
| Lead Time | 7-10 Days (Stock) / 15-20 Days (Custom) |
| Packaging | Export-Standard individual branded or neutral envelopes. |
| Certifications | FDA, CE, ISO9001, Reach. |
| Raw Materials | Premium Optical Resin with UV400/HEV Absorbers. |
| Customization | Brand printing, specific blocking rates, and HMC color options. |
