Sunglasses (glasses) lenses, what is the difference between different materials?

Sunglass lenses are divided into the following types according to the material:

1. PC sheet : Strong, not easy to break, impact resistant, specially designated lens material for sports glasses, the price is higher than that of acrylic lenses.

How to distinguish PC tablets?

When the lens is removed, there will be small particles one by one from the cross section of the lens.

2. Glass: The clarity is slightly higher than that of resin, and it is not easy to wear; but the weight is heavier, and the material is easy to break (even tempered glass), and the ability to absorb ultraviolet rays is relatively weak (unless specially processed).

3. Resin sheet: Resin is a chemical substance with a phenolic structure. It is characterized by light weight, high temperature resistance (lighters cannot burn through), strong impact resistance, and can effectively block ultraviolet rays. Most sunglasses on the market are resin lenses.

4. Nylon sheet: a kind of synthetic fiber. It has very high elasticity, excellent optical quality, strong impact resistance, and is usually used as a protective item; secondly, excellent chemical resistance, suitable for sheet metal frames, ultra-light weight, not easy to split (without frame punching). Good optical performance, 100% UV protection, rich colors, the best lenses on the market.

5. AC film: the acrylic lens. It has excellent toughness, light weight, high transparency and good fog resistance. But this kind of lens is not resistant to scratches and is particularly prone to being scratched.

6. Polarizer: Its characteristic is that it only accepts light from one direction, and blocks the light from other directions. It uses the principle of blinds to filter stray light, so that we can see things more clearly and comfortably. More suitable for driving, fishing and other outdoor activities.

7. Color-changing film: Color-changing lenses, also known as "photosensitive lenses". At present, the mainstream is resin photochromic lenses. Chemical substances such as pyrrolidone are added to the acrylic resin lenses, so that the original transparent and colorless lenses will become colored lenses when exposed to strong light for protection, so it is suitable for Indoor and outdoor use at the same time.

Several factors that determine the price of sunglasses:

1. Brand premium: It takes many years of accumulation and continuous advertising investment for each brand to be widely recognized. This part of the investment will definitely be converted into part of the price. Especially in a completely competitive industry like glasses, the most expensive operating expense for each brand is promotion.

2. Design: Every brand that wants to become bigger will spend a lot of money on originality. Design is the image of a brand and a decisive factor that differentiates it from similar competing products. Naturally, the products of good brands are vastly different from the imitations in terms of novelty of design and wearing comfort.

3. Material: As mentioned above, the lens of good material has good optical performance and strong wear resistance and impact resistance, while the lens of general material may have impurities, resulting in poor light transmittance and anti-ultraviolet function. imperfect.

Secondly, the material of the frame is different, which has a great impact on the price. Frames are broadly classified into metal, sheet and natural materials. , the tougher and lighter plates will be more expensive; titanium alloys have high strength, corrosion resistance, and are lighter. This also determines the texture, comfort and durability of the glasses.

4. Process production: Good design also requires high process details, which is not only reflected in the exquisiteness of the appearance of the glasses, but also in the comfort of wearing. The smaller the details, the greater the impact on the wearer. The more difficult it is to make, it requires sophisticated equipment and skilled craftsmen to complete.

On the contrary, for a frame with poor quality and rough production, no matter how good the lens is, it cannot guarantee the accuracy of the parameters of the glasses. Moreover, even if the actual parameters of the lens are accurate, it may be due to the poor performance of the frame material, resulting in the stress on the frame. change gradually.