How much do you know about sunglasses?
How much do you know about sunglasses?
09.17.2021 | Maconini exchange | Me Blog

How much do you know about sunglasses?

 

​​1, glass sunglasses lens

Advantages: extremely high optical performance, high surface hardness, scratch resistance

Disadvantages: heavyweight, nose pressure, fragile

Price: very high

The glass lens is the most commonly used sun lens material, but it is heavy, fragile, and the production cost is high, so the use is gradually reduced.

 

2. Resin sunglasses lenses

Advantages: light, good optical performance, easy to colour

Disadvantages: poor toughness and impact resistance

Price: The range is very wide, generally ranging from a few hundred to a thousand yuan.

Friends who wear glasses must have heard of resin lenses, but what exactly are resin lenses? Resin (CR-39) is actually a chemical substance with a phenolic structure. It is refined from phenolic components in petroleum. It is characterized by lightweight, high-temperature resistance, strong impact resistance, and can effectively block ultraviolet rays. The big advantage of resin lenses used in sunglasses is that they are easy to colour. Many fashionable sunglasses have used the colouring properties of resin lenses. However, the resin lens has poor toughness and is not resistant to impact.

3. Nylon material sunglasses lens

Disadvantages: wear resistance is poorer than glass, high production cost

Price: higher

Nylon sunglasses are used in sports brand sunglasses and high-quality big-brand sunglasses. It has high elasticity, excellent optical quality, and strong impact resistance. When nylon lenses were invented, they were used as eye protection lenses. Professional protection function. However, the production cost of nylon lenses is high, and this type of sunglasses is more suitable for sports or people with higher quality requirements.


4. TAC material sunglasses lens

Advantages: lightweight, good colouring performance, low price

Disadvantages: easy to deform, easy to scratch, poor optical performance, easy to break under impact

Price: tens to hundreds of dollars

TAC sunglasses lenses are widely used Worldwide. TAC (Triacetyl Cellulose) has a very complex composition and is one of the high-penetration polymer materials. As a sunglasses lens, TAC has the characteristics of acid and alkali resistance, light and thin texture, and high-cost performance. However, the abrasion resistance has become the soft foot of TAC lenses, and its unstable optical characteristics are also the reason why TAC lenses are finally abandoned by most famous foreign brands despite their low prices.


5. PC material sunglasses lens

Disadvantages: low wear resistance, unstable optical performance

Price: tens to hundreds of dollars

Brand: It is not recommended to buy this kind of ordinary PC plastic lens except for the special PC lens for high light transmission

PC refers to polycarbonate, which is a type of plastic (PC for short). It is a high molecular polymer containing carbonate groups in the molecular chain. Simply put, it is a plastic sunglasses lens. This material also has high and low ends. There are high light-transmitting PC films commonly used by professional athletes and coloured or colourless plastic films for a few cents.

High-light-transmitting PC film is 30 times stronger than traditional resin film and 60 times stronger than glass film. It is the most impact-resistant lens in the world. The thickened material is commonly known as bulletproof glass.

Ordinary PC film is characterized by lightweight and good colouring performance, but its disadvantages are low wear resistance and unstable optical performance. When buying PC lenses, you need to differentiate and pay attention.

6. Polarized lenses

 

A polarized lens is also called Polaroid. Its function is to only accept light from one direction and block the light from other directions. It uses the principle of blinds to filter stray light so that we can see things more clearly

Polarizer principle: In order to filter the dazzling rays of the sun shining on the water, land or snow in equal directions, a special vertical coating is added to the lens, which is called a polarized lens.

Advantages: It is the first choice for car drivers to eliminate glare, but many driving users have not noticed. Now basically the front windshield glass of the car will have a film. Its function is mainly to block ultraviolet rays, block some heat, and prevent injury caused by glass splashing. Anti-glare and other situations occur, and at the same time, according to the one-way perspective of the solar film, the purpose of protecting personal privacy is achieved.