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1.56 High Definition ASP HMC Green Coating Optical Lens - Quality from China Suppliers and Factory
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
Definition & Concept
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:
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For low myopia below 200 degrees, a refractive index of 1.50 or 1.56 can be chosen;
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For myopia between 200-400 degrees, a refractive index of 1.56 or 1.60 can be chosen;
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For myopia between 400-600 degrees, a refractive index of 1.60 or 1.67 is more suitable;
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For high myopia at 600-1000 degrees, it is recommended to choose a refractive index of 1.67 or 1.71.
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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:
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High refractive index lenses can make the lenses thinner, lighter, and more comfortable to wear.
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However, high refractive index lenses are usually more expensive and the dispersion phenomenon may be more pronounced.
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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
QWhat is the refractive index of a lens?
The refractive index refers to the ratio of the speed of light in a vacuum to its speed inside the lens material. It represents the lens's ability to bend light. A higher index means the lens bends light more efficiently.
QHow does the refractive index affect lens thickness and weight?
Assuming all other parameters are identical, a higher refractive index results in a thinner edge thickness and a lighter weight, making the glasses more comfortable to wear.
QWhat index lens is recommended for myopia between 400 and 600 degrees?
For myopia degrees ranging from 400 to 600 degrees, a refractive index of 1.60 or 1.67 is generally the most suitable option to balance thickness and cost.
QDoes the size of my glasses frame affect the choice of refractive index?
Yes. If you choose a larger frame, the outer edges of the lens will naturally be thicker. To keep the lens edges thin and aesthetic, it is recommended to opt for a slightly higher refractive index.
QWhat are the key technical specifications of this High Definition lens?
This High Definition lens is made of resin material, features a refractive index of 1.553, an Abbe Value of 34, a diameter of 65/70, and is finished with an HMC Green coating.
QWhat performance features does the lens coating provide?
The lens offers a comprehensive suite of protective features including anti-fingerprint properties, waterproof performance, high transmittance, wear resistance, anti-reflection, and UV protection.