Ritana Van Lith  - Octorber 08th 2021

What makes sunglasses so important?

Fhen Spina invented spectacles in Florence, Italy in 1289, no one would have imagined that this pair of glasses would become so important and indispensable today. But It is less known that sunglasses were invented earlier than glasses. In China, the headquarters of Mongda, the first sunglasses were invented by the Chinese in the early twelfth century. Can you imagine what it looks like? It was a crude slab of smoked quartz that helped the user to block out the sun rays. The primitive frames were roughly framed to hold them against a users' face. 

( That was unbelievable, right? )

How sunglasses work

  After nearly 1,000 years of development, the appearance of sunglasses is no longer so simple. But no matter how the sunglasses develops, no matter how gorgeous the appearance, the most important feature is that it can block the uncomfortable sunlight. And this is what we mongda are constantly looking for. Why sunglasses can block the uncomfortable glare, and at the same time protect the eyes from ultraviolet rays? All of this contributes to the metal powder filter.

   The mechanism of this filter can “select” light when it hits it. Colored glasses can selectively absorb some of the wavelengths that make up the sun's rays because they use very fine metal powders (iron, copper, nickel, etc.). In fact, when light hits the lens, the light is reduced based on the "destructive interference" process. In other words, when certain wavelengths of light (herein referred to as ultraviolet a, ultraviolet b, and sometimes infrared) pass through the lens, they will cancel each other out on the inside of the lens, which is toward the eye.

  The overlapping of light waves is not accidental: the peaks of one wave and the troughs of the adjacent waves combine to cancel each other. The phenomenon of destructive interference depends on the refractive index of the lens (the degree of deviation when light passes through different substances in the air), and it also depends on the thickness of the lens. Generally speaking, the thickness of the lens does not change much, and the refractive index of the lens varies according to the difference in chemical composition.

  In short, the core of the sunglasses is his lens. Its mechanism of lens is like the simplest artificial intelligence system and it will help you to select the light your eyes can accept. Just like an expensive AI system, a good lens is naturally expensive. As a fashion recommender, I don't recommend you to purse famous brands, because the price is too expensive and unreasonable.
 
  Of course I will never recommend cheap products to you, because there is no doubt that a poor quality lens will cause irreversible damage to your eyeballs. In general, the products I recommend always have their unique advantages. No matter what sunglasses I recommend, the quality of lens is the first factor I consider. 

Why select Mongda?

  Although Mongda is a relatively new brand, its safety deserves to be fully believed. Mongda's factory is located in Xiamen which is the world's largest export city for sunglasses. (https://en.wikipedia.org/wiki/Sunglasses) . In the past ten years, Xiamen’s Sunglasses factory produced most of the world’s medium and high grades sunglasses. There is no doubt that Xiamen has a very complete production supply chain and ecosystem. Based on my experiences, the better the economics of scale, the better the product quality be guaranteed. Therefore, in this ecosystem, we trust the quality of mongda lenses. 

Buying Advice: Low Brand awareness, If you are pursuing a sense of brand, it is not recommended to choose.

  This sunglasses is a classic lovers style whose lenses are available in black and blue. How to describe this pair of sunnies? The first feeling that comes to mind is “simple yet stylish”. It can be described as a classic light-luxury design. I personally feel that men’s model are more worth buying than women’s models. When you take Mongda Cabin Classic in your hand or wear it for the first time, I promise that you will exclaim for his lightness and comfort. Please observe the design of Mongda Cabin Classic carefully, especially the bridge and temple tips, you will find that there is basically no pressure on the bridge of the nose and temples when you wear it. Thanks to the designer in Team Mongda, the people-oriented design is well highlighted. Besides quality of sunglasses, what I recommend is the design concept behind the product. Let’s take a closer look at these two sunglasses: The gold-rimmed design in men’s model highlights well the details of Mongda Cabin series. In contrast, women's models are designed with silver edges, which can highlight the temperament of women.