What is lens refractive index

The lens refractive index is the ratio of the speed of lighting in real vacuum to the spread of light in the lens material, which reflects the lens's refractive ability to light.

At present, mainstream resin lenses on the market are: 1.56, 1.60, 1.67, 1.71, 1.74 and other types.Under the same prerequisite, the higher the refractive index of the lens, the thinner the lens, the lighter.

Speaking of this, many friends are very happy, of course, I hope that they can be equipped with a light and thin glasses!But don't ignore another problem: Generally, the higher the refractive index of the lens, the lower the number of Abbe, and the more obvious the color scattered.Because the scattering will affect the imaging effect of the medium, we measure the imaging quality of the lens through Abei.The higher the number of Abe, the smaller the color scattered, the clearer visual effect.Abe's number is too low, which will make the lens a rainbow pattern, affecting the user's visual clarity.

Therefore, the higher the refractive index is better, the better the lens refractive index must be selected to better protect the eyes.

What is the refractive index of polarized lens

The refractive index of polarizing lenses is not high. Generally, the refractive index of the selection of myopia below 500 degrees is 1.56. If you need to consider the thickness of the glasses, you can also choose the refractive index of 1.60 and above.The price of polarized lenses with higher refractive indexes such as 1.71, 1.74 is also higher, and you need to customize it. You can choose according to your own needs.

Generally speaking, polarizing glasses do not need to be worn all the time, and mostly use it during outdoor sports, so the ordinary 1.56 refractive index can meet most of the requirements.

The benefits of high lens refractive index

1. For people with a height, wearing thick lenses all day not only easily cause visual fatigue, but also easily cause compression or cause the glasses to decline or pain in the ears.The high refractive index lens refractive index will be relatively thin and lighter, and it is usually relatively comfortable to wear.

2. Too thick lenses will not only make the wearer have a sense of depression, but also affect the aesthetics of the wearer. The relatively thin lens will look better.

3. Compared with low refractive lenses, high refractive lenses are better than lenses with low refractive indexes than lenses with lower refractive indexes.

How to choose the right lens refractive index

1. Patients with myopia below 200 degrees are recommended to use a 1.50 refractive lens.

2. Patients with myopia below 600 degrees are recommended to use a 1.56 refractive index lens.

3. Patients with myopia below 800 degrees are recommended to use a 1.60 refractive index lens.

4. Patients with myopia below 1000 degrees are recommended to use a 1.67 refractive index lens.

5. Patients with myopia below 1000 degrees are recommended to use a 1.74 refractive lens.

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