The extraction of titanium
Nowadays, the commonly used extraction method is the reduction method of titanium tetrachloride. Compared to copper and zinc, although high in content, much more expensive. On the other hand, China is the country with the largest reserves of titanium, and a large number of steel mills with perennial overcapacity began to produce titanium, so the price of titanium fell year after year.
How to test a blue-light lens?
Blue light-blocking glasses have many membrane layers, and all kinds of colors of the film are not the same. Actually, the membrane layer of anti-radiation effects is not large but has high strength and chemical resistance of lining norm of glasses and the effect of protection for the eyes is very important.
Can you buy a pair of rimless glasses with a high prescription?
Rimless glasses have many benefits. Rimless glasses are a popular choice for eyewear wearers in terms of performance, price, and styling. However, you may wonder if rimless glasses will fit your prescription. The answer is yes, you can get rimless glasses, even with a prescription.
3 Common Problems with Progressive Lenses
Though progressive lenses are popular to correct some eye conditions, there are also some drawbacks. So, in the following section, we will show you some common problems with progressive lenses.
Dizziness: the three different focal lengths of progressive lenses can make people susceptible to dizziness, as well as vertigo. From long to medium to short distance, the lenses offer a gradient of increasing strength. So, it would have trouble in adapting the glasses for the people who are wearing them for the first time. A common mistake is to look out of the wrong focal length, causing their vision to be blurry and lead to an overall feeling of dizziness.
Peripheral distortion: another common problem of progressive lenses is the way in which they blur peripheral vision. Most glasses cause an initial distortion to vision. However, the three different segments found in these lenses can make that distortion feel more prominent than other pairs of eyeglasses. And most people may need two weeks to adjust to progressive lenses.
Depth perception: Since progressive lenses provide three different prescriptions to see objects clearly for different distances, it is important that you need to move your head instead of your eyes when focusing on objects at different distances. Prior to adjusting to this little nuance, progressive lenses can cause depth perception to feel off.
From the above information, you have known some common problems with progressive lenses. So, you may ask how to adjust the progressive lenses. The most popular way is that you need to wear them frequently.
Best Titanium Eyeglasses Frames Brand - BLACKFIN
BLACKFIN is a traditional Italian designer eyewear brand. It is greatly respected in the independent eyewear industry because of its focus on titanium glasses. For BLACKFIN, this is not just another random piece of material, but part of an entire belief system.BLACKFIN's products are all manufactured in Italy and crafted with the highest quality levels. They are highly valued by opticians because they are made accurately in line with high-quality workmanship. The brand places its entire focus on titanium as a material and manufactures all frames in Italy.BLACKFIN not only focused on the unbelievable material of glasses and sunglasses, but it built the spirit of the company.
The characteristics are different.
Cellulose acetate materials have high wear resistance, and hardness and texture are very good. The sunglasses are made of acetate fiber plate with plate cutting and processing. The main materials are plate and plate plus steel sheets. The characteristics of the plate are that they are not heavy. It has a hardness, good gloss, and steel combined to strengthen the firm performance. And they have a beautiful style, not easy to deform and change color, durable. The plated one deduces fashion, easy-to-match clothes, and integrates the thickness of the plate and the texture of the metal, reflecting the personality style.
The chemical name of the CP material is propionic acid fiber, cellulose molecules for the hydroxyl propionic acid in the polymer. It has good weather resistance and low-temperature resistance. The current market of this material is mainly used in glasses, toys, and a variety of shells. It is one of the acrylic resin derivatives. The material is a large sheet and can be dyed in a variety of colors.
Why do you need low bridge glasses?
The glasses always slide in front of the nose. No one wants to keep putting their glasses back in place, especially in a conversation. Your glasses will slide down your nose, in other words, they won't sit on the bridge of your nose, and the frames will hit your cheeks, which may give you a cheek rash. The glasses move when you smile or laugh. The lenses rub against your eyes/eyelashes.