Match and combine according to the requirements. I understand that it is because I want to protect my eyes by using better cheapest eyeglasses lenses. The lens has high hardness and is not easily scratched.

Cost effectiveness is choosing the cheapest combination of lenses and frames that suits you. Suitable includes both price and health, as well as the time dimension, which is the lens replacement cycle.

The optimal solution obtained by comprehensively considering all the cheapest eyeglasses information. As the saying goes: expensive is not necessarily good, not necessarily expensive, suitability is the most important.

No need for me to say, everyone knows that the price of glasses varies greatly. What are the differences among them? How much does it cost to pair glasses properly?

Let's first take a look at the reasons why there is such a big difference in the price of glasses? Firstly, it must be the brand. The biggest difference is the additional value that the brand endows.

Big brands spend a lot of money to shape their brand, which itself incurs a lot of costs, and differentiated pricing can better distinguish target users.

In addition to these big brands, most branded glasses also have better designers to ensure the popularity of the product's appearance and the safety of its structure. And there are stricter standards for quality control, so in terms of cost, it will also be higher than ordinary brand glasses.

Secondly, the cost of the product itself. This involves the material cheapest eyeglasses selection, process, mass production, and so on. Good materials are more expensive. 

The process is the same, the production and processing of glasses actually involves many technological processes, and each process requires corresponding labor costs, etc. Another factor is the scale of mass production, which is why handmade customization tends to be more expensive.