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1.56 High Definition ASP HMC Green Coating Optical Lens - Quality China Factory Suppliers for Vision Correction
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 are the specifications of the High Definition lens?
The High Definition lens is made of Resin material, has a refractive index of 1.553, an Abbe Value of 34, a diameter of 65/70, and features an HMC Green coating.
What performance benefits do these lenses offer?
These lenses feature six key performance advantages: Anti-fingerprint, Waterproof, High transmittance, Wear resistance, Anti reflection, and UV protection.
What is the refractive index of a lens?
The lens refractive index is the ratio of the propagation speed of light in a vacuum to its speed in the lens material. It directly reflects how strongly the lens can refract light.
How does refractive index affect the thickness and weight of lenses?
With all other parameters being equal, a higher refractive index results in a lens with thinner edges and lighter overall weight, making them more comfortable to wear.
What refractive index is recommended for high myopia (600 to 1000 degrees)?
For high myopia between 600 and 1000 degrees, it is recommended to choose a refractive index of 1.67 or 1.71 to maintain a suitable lens thickness.
Do higher refractive index lenses always have more dispersion?
Not necessarily. While high index lenses traditionally have more pronounced dispersion, material advancements have broken this rule. For example, 1.71 refractive index lenses have a higher Abbe number than most 1.56 and 1.67 lenses, meaning they offer less dispersion.