All the differences between spectacle lenses 1 6 and 1 67

If you don't look at the brand, it must be thinner than it, and it is also expensive. This is related to the degree, and the ordinary refractive index is used below 300 degrees.

It is enough, and it is enough to use it at about 300 degrees, but it is not only wasteful, but it is uncomfortable to look around the range lens. The higher the refractive index and the thinner it is, the more expensive it is, but the dispersion at the edge of the lens is more severe, and it is not as comfortable as a thick lens. It can be used at about 600 degrees.

In terms of the quality and popularity of the lenses, it is definitely Essilor.

of the good. You should use lenses with a reasonable refractive index according to the power, and you need to pay attention to this first. Each brand has a suitable refractive index.

After choosing the refractive index, you don't have to use the budget ** to choose what lenses. If you want to change your glasses every year, you can also use domestic lenses or Korean lenses, which are several times cheaper. The wholesale price of monopoly sales of big brands is very high, and the selling is also very expensive, and the cost of raw materials is not a few dollars at all.

If you are more demanding, pay attention to the brand value.

Then choose Essilor. Kodak.

The usage rate is not high, the popularity is not high, and if I choose Kodak, I would rather use ordinary domestic ones.

The refractive index of the same degree is thicker than the refractive index, but the dispersion coefficient is higher, the raw materials are different, and only the non-spherical ones have a spherical surface. Everything else doesn't make a difference.

The differences between spectacle lenses are as follows:

1. Refractive index of the lens.

The difference: Usually the refractive index above the refractive index is a high refractive index. Mainly as a reference, the refractive index is equivalent to the luminosity of the eye from high to low. So the refractive index is higher.

2. The difference between the thickness of the lens: the refractive index of the lens of the same power and the same material will determine the thickness, beauty and beauty of the lens. Because the higher the refractive index, the lighter and thinner the lens, and the higher the relative **. Therefore, the lens ** ratio is higher.

3. Abbe number.

The difference is that the higher the refractive index of the lens, the lower the Abbe number and the dispersion.

The more obvious. The higher the refractive index of the material, the lower the Abbe number. However, with the upgrading of lens material technology, this rule is gradually being broken. For example, refractive index lenses have a higher refractive index, but the Abbe number is higher than that of refractive index lenses and most refractive index lenses.

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1. Different thicknesses:

For the same power, the lower the number, the thicker the lens. For example, 600-degree glasses are the thickest, the medium, and the thinnest. The lens is heavier than the lens, and if all other parameters are the same, the refractive index of the lens is higher, and the edge of the refractive index lens is thinner than the lens.

2. NoSame as:

Refractive index lenses are produced more in China, so they are relatively low, while refractive index lenses are relatively few in China, and they need to be accompanied by the use of national rulers, so they are relatively high.

3. Different dispersion:

The higher the refractive index of the lens, the lower the dispersion, and the lower the refractive index of the ampand, so the dispersion will be more serious. The general than and more worthy of choice, but if the pursuit is cost-effective, if you can use the Manchu forest foot demand then it is certainly worth choosing.

Spectacle lenses, what is the difference?

1. The difference in the refractive index of the lens, the refractive index is equivalent to the luminosity of the eye from high to low. Example: The refractive index is higher than above; 2. The difference between the thickness of the lens**

The higher the refractive index, the lighter and thinner the lens. Therefore, the lens ** ratio is higher. 3. The difference between Abbe number: The Abbe number is relatively low.

The higher the refractive index of the lens, the lower the Abbe number and the more pronounced the dispersion. The higher the refractive index of the material, the lower the Abbe number.

The difference between glasses and and and is in the thickness of the lens: <<

This refers to the refractive index of the lens.

The higher the refractive index, the thinner the thickness of the lens, which means that it is thinner.

Plastic lenses. Only .74, this is the refractive index of the plastic lens, the higher the refractive index, the thinner and more beautiful the lens.

The common spectacle lenses on the market are roughly divided into glass sheets, resin films, and cosmic films (commonly known as: PC films, space films) according to the material.

Usually the lenses are marked with .74,, refers to the refractive index of the lens, and the higher the refractive index, the thinner the lens of the same luminosity.

Plastic lenses are becoming more and more popular due to impact resistance.

Strong and unbreakable, the lenses can be made thinner and have no problem with rimless and half-rim frames. From another point of view, its advantages are also its weaknesses.

It is not easy to break because of its low hardness, so the surface of the lens is not good enough to wear and can be easily scratched. Although it can be hardened and filmed, it still needs to be carefully protected to maintain a long life. Therefore, high-fold lenses, lenses are also highly myopia.

A good choice for patients. Since there are only one or two manufacturers of high-fold glass lenses in China, the lenses need to be customized according to the power of consumers.

The sum of spectacle lenses mainly refers to the refractive index of the lens, which is the ability of the lens to gather light.

Among them, the thickness of the refractive index lens is thinner than that of the refractive index lens. ​

The refractive index of the lens material belongs to its inherent properties, which is directly related to the refractive ability of the lens light, the higher the refractive index, the thinner the lens thickness, but the light transmittance will also decrease accordingly, ** will also be higher.

Generally, for patients with high myopia, you can choose lenses with a relatively high refractive index, which can make the edge thickness of the glasses thinner, lighter in weight, and more comfortable to wear, while for patients with low myopia, you can use lenses with low refractive index, which is cheaper and has a higher light transmittance.

The refractive index lens belongs to the lens with a lower refractive index, which is more suitable for the use of large stoves in people with low myopia or moderate to low myopia.

If you are highly myopic or ultra-myopia, you should recommend lenses with a refractive index or refractive index, and the mirror should be lighter and thinner.

There are also refractive index lenses on the market before hail, but ** may be higher, and patients with myopia need to choose lenses with different refractive index types according to their own needs.

1. These numbers represent the optical refractive index of the lens, that is, in the case of the same thickness of the lens center, the edge of the lens with the same refractive index with the same power and the same material is thinner than that of the lens with a low refractive discenter; The higher the number, the thinner the lenses, and the higher the **.

2. If the patient's prescription is less than four, only the lenses you need to choose when you wear glasses. However, if the power is more than four, it means that consumers must choose lenses to see more clearly.

.56 is the difference between lenses and lenses, what is the difference between lenses and lenses? Lenses belong to medium refractive index lenses, which have both spherical and aspherical designs, and lenses are lenses with a high refractive index, and only aspherical designs.

Aspherical lenses can reduce the edge phase contrast of the lenses, resulting in a clearer and more natural field of vision. For the myopia group with a high general power, it is more suitable to choose aspherical lenses with high refractive index.