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China 1.56 High Definition ASP HMC Green Coating Optical Lenses - Suppliers & Factory Direct Quality
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?
Refractive index refers to the ratio of the propagation speed of light in a vacuum to its speed in the lens material. It represents the lens's ability to bend light. A higher refractive index means the lens bends light more efficiently.
How do I choose the correct refractive index for my myopia level?
Selection depends on your prescription: low myopia (below 200 degrees) is suited for 1.50 or 1.56 lenses; mild myopia (200-400 degrees) fits 1.56 or 1.60; moderate myopia (400-600 degrees) fits 1.60 or 1.67; high myopia (600-1000 degrees) requires 1.67 or 1.71; and severe myopia (exceeding 1000 degrees) is best served by 1.71, 1.74, or higher index glass lenses.
Does a higher refractive index make lenses thinner and lighter?
Yes. Assuming all other parameters remain identical, a higher refractive index lens will feature thinner edges and be lighter in weight, which significantly increases overall wearing comfort.
How does frame size affect the choice of lens refractive index?
If you select a larger frame, the outer edges of the lens will naturally be thicker. To prevent the edges from appearing too thick and heavy, you should choose a lens with a higher refractive index.
What are the advantages and disadvantages of high refractive index lenses?
The primary advantages are that they make lenses thinner, lighter, and more comfortable. The disadvantages are that they tend to be more expensive and may display higher dispersion. However, modern materials like 1.71 index lenses offer high Abbe numbers to counteract this dispersion issue.
What are the specifications of the 1.553 High Definition lens?
The 1.553 High Definition lens is made of resin material, has an Abbe Value of 34, a diameter of 65/70, and features an HMC Green coating.