Have you ever seen glasses with packaging higher than the cost of frames? The cheapest eyeglasses online frame with packaging that is even more expensive than a frame, high-end outer packaging, finely crafted glasses case, and various small gifts should be a configuration that only mid to high-end glasses can have.

The selection of lenses first requires understanding the refractive index, Abbe number, brand characteristics, and differences between each category of the brand, all of which will have an impact on the use of lenses.

Everyone has different needs, data, usage habits, and so on for lenses. The lenses that are suitable for everyone are naturally different.

Firstly, we need to talk about the refractive index, which can be better understood as' density '. The data related to it includes two dimensions: thickness and hardness.

If you have a high refractive index and don't want the lenses to be thick, choose a higher refractive index. Hardness refers to the degree of wear resistance. If your lens is frequently scratched and is expensive to use, you can also increase the refractive index to reduce the degree of lens wear.

Another parameter is the Abbe number, which is selected after the refractive index is chosen (children's glasses need to first select the Abbe number before choosing the refractive index, with different priorities). The Abbe number is better understood as a resolution.

The larger the Abbe number, the less likely the lens is to distort. So, after selecting the refractive index based on the degree, it is better to choose one with a higher Abbe number. Finally, the category of lenses and the selection of film layers vary for each brand.

Before fitting glasses, it is recommended to have an optometry and try them on. The required data includes myopia discount eyeglasses online data, astigmatism, and the distance between the pupils when selecting the frame.