1. Photochromic Principle    
This lens adopts Spin Coating technology, where photochromic agents are evenly applied on the outer surface of the lens via spin coating. These photochromic agents are distributed in a scissor-like molecular structure. When exposed to ultraviolet (UV) light, the molecules automatically close to block light from entering. Leveraging their excellent light responsiveness and colorability, the agents react quickly to light changes—enabling the lens to automatically adjust its tint based on the intensity of UV rays.

2. Coating Features    
Different coatings can be selected based on specific needs:    
HMC (AR) Coating (High-Hardness Anti-Reflective Coating): Effectively reduces light reflection on the lens surface, improves light transmittance for clearer vision, and enhances lens hardness to minimize the risk of scratches.

1. Core Product Parameters    
High Refractive Index and Lightweight & Thin Features    
This lens boasts a high refractive index of 1.67, which ranks at a relatively high level in the refractive index system of resin lenses. Compared with lenses with lower refractive indices (such as 1.50 and 1.56), when correcting the same diopter, the 1.67 refractive index lens is significantly thinner and lighter. Taking 600-degree myopia as an example, the edge thickness of the 1.67 refractive index lens can be approximately 30%-40% thinner than that of the 1.56 refractive index lens. This is extremely friendly for people with moderate to high myopia (400 degrees or above) or hyperopia—it can significantly reduce the overall weight of the glasses, ease the pressure on the bridge of the nose and ears, and greatly improve wearing comfort. At the same time, it effectively improves the appearance issue caused by overly thick lens edges, making the glasses more aesthetic and exquisite.    

2. Abbe Number and Dispersion Control    
The Abbe number is approximately 31. The Abbe number is used to measure the degree of lens dispersion; the higher the value, the smaller the dispersion. Although the Abbe number of the 1.67 ASP Green Coating lens is not particularly high, it can still provide wearers with clear and natural visual effects in various daily visual scenarios, such as reading, watching TV, driving, and performing fine manual work. By effectively reducing phenomena like blurred color edges and rainbow light spots caused by dispersion, it alleviates eye fatigue and keeps the eyes comfortable at all times.    

3. Material Characteristics    
It generally adopts MR-7 resin material, with a specific gravity of approximately 1.35. This material has excellent impact resistance—compared with traditional CR-39 resin material, it is less likely to break when subjected to external impact, providing reliable safety protection for the wearer’s eyes. It is especially suitable for people with high activity levels who are prone to glasses collisions, such as athletes, students, and those who often engage in outdoor activities. Meanwhile, the MR-7 material has good processing performance, which can meet the requirements of various complex lens processing technologies and ensure the precise molding and adaptation of the lens.    

4. Diameter Specifications    
Common standard diameters include 65mm, 70mm, and 75mm, and customization is also available according to customers’ special needs. An appropriate lens diameter is crucial to ensuring that after the lens is installed in the frame, the wearer can obtain the optimal field of view and a comfortable, stable wearing experience. When selecting the lens diameter, factors such as the size and shape of the frame, as well as the wearer’s facial features, need to be comprehensively considered.

1. Material & Performance Specifications    
Material: Made of resin, featuring lightweight and strong impact resistance. Compared with traditional glass lenses, it is more suitable for scenarios involving frequent daily activities.    

2. Blue Light Protection    
This lens effectively blocks high-energy visible (HEV) blue light and can cut off light with a wavelength of approximately 420nm. It filters out 100% of ultraviolet (UV) rays and 40% of blue light, reducing blue light irritation to the eye retina and lowering the risks of eye fatigue, dryness, and macular degeneration.    

3. Coating Functions    
The green coating integrates multiple functions:    
Hard Coating (HC): Enhances the surface hardness of the lens and improves its scratch resistance.    
Hard Multi-Coating (HMC): While increasing hardness, it also effectively reduces light reflection on the lens surface, improves light transmittance, and makes vision clearer and brighter. Generally, the light transmittance can reach over 97%.    

4. Visual Effect    
The lens is transparent, maintaining excellent visual clarity without altering the color of objects being viewed—ensuring a natural and authentic visual experience. Additionally, it reduces glare and improves contrast, allowing wearers to enjoy more comfortable vision in various environments.    

5. Suitable Crowds    
Ideal for all people who need to wear glasses, especially office workers and students who frequently use electronic devices. It provides strong protection for their eye health in the digital age.

1. Optical Performance & Material Advantages    
High Refractive Index for Lightweight & Slim Experience: Compared with 1.61 refractive index lenses, 1.61 refractive index lenses reduce edge thickness by 15%-20% and weight by approximately 10% at the same diopter. For example, for an 800-degree myopia, when matched with a large-frame eyeglass frame, the edge thickness of the lens can be controlled within 8mm. This solves the problem of "bottle-bottom" thick lenses for people with high myopia, ensuring lighter and more comfortable wearing.

2. Core Functions of TI-purple Titanium Ion Purple Coating    
Titanium Ion Strengthening Technology: Nano-scale titanium ion particles are integrated into the coating layer, increasing the surface hardness to 8H (compared with 6H for ordinary green coatings). It is not easy to scratch due to daily friction, and its service life is extended by more than 30%. The stability of titanium ions can also resist chemical corrosion from sweat, cosmetics, etc., making it suitable for people with oily skin or those who wear makeup.    

Dual-Effect Protection Mechanism:    
Blue Light Filtration: The cerium ion component in the purple coating selectively absorbs high-energy blue light while retaining beneficial blue light (455-490nm), avoiding color distortion that may affect visual judgment (such as identifying traffic lights while driving).    
Anti-Reflection Optimization: Based on the principle of optical interference, the purple coating focuses on reducing the reflected light of 550nm wavelength from electronic screens. This minimizes glare when using mobile phones or computers at night and alleviates eye fatigue.    
Unique Appearance Design: The edge of the lens shows a light purple luster, which is different from the cool tone of traditional green coatings. When matched with metal eyeglass frames, it presents a more fashionable texture, meeting the demand of young people for the decorative effect of eyeglasses.    

3. Suitable Scenarios & Crowds    
Heavy Digital Device Users: Office workers, programmers, and students who use electronic devices for more than 4 hours a day. It can effectively relieve eye fatigue symptoms such as dry eyes and soreness, and long-term wearing can reduce the risk of retinal light damage.    
People with High Myopia: For those with myopia of over 600 degrees, while obtaining thin and lightweight lenses, it also combines blue light protection and aesthetics, eliminating the need for additional blue light-blocking clip-on lenses.    
Dual Use for Outdoor & Indoor: Full-band UV protection makes it suitable for commuting and outdoor activities. There is no need to change lenses when returning indoors, and the low-reflection feature of the purple coating ensures clearer vision in lit environments.    
Fashion-Conscious Consumers: Users who pursue both functionality and appearance. The light purple coating adds a personalized touch to the eyeglasses, making them suitable for various styles such as business and casual.

1. Photochromic Performance   
Spin coating technology is used to evenly coat the outer surface of the lens with a color-changing agent. When exposed to UV light, the lens quickly reacts to the light, gradually darkening in color, acting like sunglasses and shielding the eyes from harmful glare. Back indoors, the lens' color gradually lightens and returns to its transparent state. The color change is rapid, typically completing the transition from light to dark in a short period of time, and the resulting color remains uniform and stable.

2. Material Advantages    
The lens is made of KR Resin, which boasts excellent optical and physical properties. It is lightweight, ensuring more comfortable wearing, while also offering a certain level of impact resistance to better protect the eyes.