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Product Introduction
Introduction: The Ultimate Synthesis of Slimness and Adaptability
For patients with extreme prescriptions, the quest for a thin lens often meant sacrificing functional features like light adaptation. Our 1.74 Ultra-High Index Photochromic Lenses break this barrier, offering the thinnest possible profile combined with rapid-reaction light-sensing technology. By utilizing the most advanced 1.74 refractive index monomers, we provide a lens that is significantly lighter and flatter than traditional options, while the integrated photochromic molecules ensure a seamless transition from clear indoors to deep tint in bright sunlight.
These lenses are engineered for the high-end market where aesthetics and comfort are non-negotiable. The 1.74 substrate is paired with our proprietary "Spin-Coat" technology, ensuring the darkening effect is uniform even on high-diopter curved surfaces. This is the premier choice for high-myopia patients who want a single pair of glasses that function as both clear prescription eyewear and protective sunglasses, all while maintaining an incredibly sleek and elegant frame profile.
Specification: 1.74 Photochromic Performance
| Refractive Index | 1.67 (Ultra-Thin) |
| Activation Speed | Darkens in < 30 seconds |
| Fading Speed | Returns to 70% clarity in < 2 mins |
| UV Protection | 100% UV400 Protection |
| Lens Design | Double Aspheric Options Available |
| Abbe Value | 33 |
| Coating | Super Hydrophobic AR Coating |
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: High-End Consumer Scenarios
- Extreme Myopia: Specifically for users with prescriptions above -6.00D needing thinness.
- Outdoor Travelers: Ideal for high-prescription users who move between indoor and sunlit environments.
- Luxury Eyewear: Fits perfectly in high-end, designer frames that require thin lens edges.
- Light Sensitive Users: Provides immediate relief from sudden glare for sensitive eyes.
- All-Day Wearers: Eliminates the need to carry separate prescription sunglasses.
Advantage: Unmatched Visual Aesthetics
- World-Class Thinness: The 1.74 index provides the thinnest lens edge currently available in the resin market.
- Rapid Darkening: High-sensitivity molecules react instantly to UV radiation for maximum comfort.
- Flat Profile: Aspheric technology reduces the "magnified eye" look common in high-plus prescriptions.
- Superior Clarity: High-grade monomers ensure a crystal-clear base without the common "cloudy" look.
- Lightweight Design: Dramatically reduces nose pad pressure for high-prescription wearers.
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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
Frequently Asked Questions (FAQ)
- Q: How dark do these get?
- A: They reach approximately 75-80% tint depth depending on UV intensity and temperature.
- Q: Do they work inside a car?
- A: Standard photochromic lenses react to UV; since windshields block UV, they will tint only slightly.
- Q: Is 1.74 more fragile?
- A: No, it has excellent structural integrity, though it is best suited for full-rim frames.
- Q: Does the darkening effect wear out?
- A: Our premium molecules are designed for a lifespan of 2-3 years under normal usage.
- Q: Can these be blue-cut as well?
- A: Yes, we offer a 1.74 Photo-Blue-Cut hybrid version.
- Q: What is the Abbe value?
- A: The Abbe value is 33, which is excellent for an ultra-high index material.
- Q: Are they available in Brown?
- A: We offer both high-contrast Brown and neutral Grey.
- Q: Do they stay clear at night?
- A: Yes, they return to a fully transparent state (over 95% transmission) in the absence of UV.
- Q: Can I get these in progressive?
- A: Yes, we support 1.74 photochromic for free-form progressive designs.
- Q: Is there a warranty?
- A: We provide a 1-year warranty on the coating and photochromic performance.
Payment and Shipping Policy
- Payment: T/T (Telegraphic Transfer), L/C, or Credit Line for established distributors.
- Shipping: Standard Air Express (UPS/DHL) for RX orders; Sea Freight for bulk 1.74 stock blanks.
- Packaging: Premium vacuum-sealed individual envelopes to protect the photochromic layer.
- Lead Time: 15-20 days due to the precision required for 1.74 casting and coating.
Comprehensive Business Information
| MOQ | 50 Pairs |
| Lead Time | 15-20 Days |
| Packaging | Reinforced moisture-proof export cartons. |
| Certifications | FDA, CE, ISO9001. |
| Raw Materials | Advanced 1.74 High-Refractive Monomer. |
| Customization | Specific base curves and custom coating tints. |
