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1.56 High Definition ASP HMC Green Coating Optical Lens - China Suppliers & Factory Direct Supply
Data
| Product | High Definition lens | Index | 1.553 |
| Material | Resin | Abbe Value | 34 |
| Diameter | 65/70 | Coating | HMC Green coating |
Performance
Anti-fingerprint
Waterproof
High transmittance
Wear resistance
Anti reflection
UV protection
Lens refractive index
It refers to the ratio of the propagation speed of light in vacuum to the propagation speed of light in the lens material.
It reflects the refractive power of the lens towards light.
The higher the refractive index, the stronger the refractive power of the lens towards light.
When choosing the refractive index of a lens, the following factors can be considered:
Degree:
- For low myopia below 200 degrees, a refractive index of 1.50 or 1.56 can be chosen;
- For myopia between 200-400 degrees, a refractive index of 1.56 or 1.60 can be chosen;
- For myopia between 400-600 degrees, a refractive index of 1.60 or 1.67 is more suitable;
- For high myopia at 600-1000 degrees, it is recommended to choose a refractive index of 1.67 or 1.71.
- For myopia exceeding 1000 degrees, glass lenses with refractive indices of 1.71 or 1.74, or even higher, can be considered.
Frame Size:
If you choose a larger frame, in order to ensure that the edges of the lens are not too thick, you may need to choose a slightly higher refractive index.
The relationship between the refractive index of lenses and the thickness and weight of lenses:
Assuming all other parameters are the same, the higher the refractive index of the lens, the thinner the edge thickness of the lens, and the lighter the lens.
Advantages and disadvantages of different refractive indices:
High refractive index lenses can make the lenses thinner, lighter, and more comfortable to wear. However, high refractive index lenses are usually more expensive and the dispersion phenomenon may be more pronounced.
With the advancement of material technology, this law is gradually being broken. For example, the Abbe number of lenses with a refractive index of 1.71 is higher than that of most lenses with a refractive index of 1.56 and 1.67.
Frequently Asked Questions
What is the refractive index of a lens?
The refractive index is the ratio of the speed of light in a vacuum to its speed through the lens material. It indicates how efficiently the lens bends light; a higher index means the lens bends light more effectively.
How do I choose the right refractive index for my myopia prescription?
For mild myopia (under 200 degrees), a 1.50 or 1.56 index is ideal. For moderate myopia (200-400 degrees), choose 1.56 or 1.60. For stronger myopia (400-600 degrees), 1.60 or 1.67 is recommended. For high myopia (600-1000 degrees), select 1.67 or 1.71. For extreme myopia (over 1000 degrees), 1.71, 1.74, or higher is best.
How does the frame size affect my choice of lens refractive index?
Larger frames require larger lens blanks, which can result in thicker outer edges. To keep your glasses looking sleek and thin, you should choose a higher refractive index lens when opting for oversized frames.
What are the advantages of high refractive index lenses?
High refractive index lenses require less material to correct your vision, making the lenses significantly thinner, lighter, and much more comfortable to wear throughout the day.
What is the relationship between the Abbe number and the refractive index?
Traditionally, higher refractive index lenses have lower Abbe numbers, which can increase visual dispersion (color fringing). However, modern lens technology has improved this; for example, 1.71 index lenses feature a higher Abbe number than many 1.56 and 1.67 lenses, offering both thinness and superior optical clarity.
What performance features do these High Definition lenses offer?
These lenses feature HMC Green coating and provide six main performance benefits: anti-fingerprint protection, waterproof properties, high light transmittance, wear resistance, anti-reflection, and UV protection.