Evolution of hard coating technology
The first generation of the use of hard coating technology began in the early 1970s, the quartz material is deposited on the surface of a resin lens under vacuum conditions, form a very hard anti-wear film. However, due to the mismatch between the thermal expansion coefficient and the film base material, it is easy to delaminate and crack the film. Instead, it forms the mottle on the surface of the lens, and the effect is not optimal.
The second generation of hard coating technology is the use of the 1980s. The surface of the resin sheet is coated with a material with high hardness and not easy to be brittle and cracked by an immersion process. At this time, anti-reflection coating lenses had appeared and gained the recognition of consumers, but the mismatch between adding hard coating and anti-reflection coating still caused serious lens wear.
The third generation of hard coating technology was developed in the 1990s, mainly in order to solve the problem of wear resistance after coating resin lenses with an anti-reflection film. The hardened material evolved into a polymer organic matrix material.
Fourth-generation coating technology is dominated by silicon atoms, in which the hardened solution contains both organic substrates. It contains inorganic ultrafine particles, including silicon elements, which make the hard coating not only tough but also hard.
What is the cheapest way to buy prescription glasses?
After the examination, you will bring your optometry sheet and go to the optician to match your glasses. Note that the optical shop has professional qualifications. The refractive index of the resin lens, such as 1.49, 1.56, 1.61, 1.67, and so on, mainly depends on the degree. If the degree is not high, 1.56 will do. In addition, the sophisticated store will also measure the nose height, nose width, the distance between the eyes and ears, and the forward angle of the frame, which are also indicators of whether the glasses are comfortable to wear. It is recommended to try them on after they are fitted, and the time to try on them should be longer, so as to determine whether the glasses are suitable.
How to Choose Glasses for Long Face?
Thick frame glasses: the third glasses for long faces we want to mention are the thick frame glasses. They can add width to your face for a more balanced look.
Aviator glasses: to balance the feature of long face, aviator glasses are a good choice, which includes a wider top and more narrow bottom, pairs perfectly with a long face.
Long faces have a long list of options when it comes to selecting the perfect pair of frames. Whether you are looking for a more polished, academic look or prefer a more casually cool style, you can find a pair of glasses making your personality pop.
Therefore, if you need a pair of glasses for long faces, you can try Koalaeye glasses. They are stylish and cheap. In addition, you can get a pair of prescription glasses online and the glasses will be mailed to you.
Two Tone Glasses Tortoise and Light Yellow
The rectangular two tone glasses provides additional flexibility and comfort with its innovative design, which is especially designed for men. Two tones, the tortoise in the upper part and the khaki in the bottom part. The high-quality acetate makes it luxurious and durable, while the unique finish adds a stylish touch to the frame. In this way, the intricate details can show some extra style while still being perfectly suitable for everyday wear.
How to Get Used to Progressive Lenses?
How to adjust to a pair of new glasses? How long does it take to adjust to a new pair of glasses? In general, there are several ways for adjusting to progressive lenses. In this section, we will show you some of them.
- Put on your new progressive glasses in the morning and wear them for at least one hour or two. The next morning, try a few more hours. Develop your tolerance to adjust to them.
- When you walk, look straight ahead, not down at your feet. And, point your nose in the direction you want to look, not just looking left or right with your eyes.
- Don’t switch between your new pair and the old one frequently.
- Make sure your progressive glasses fit properly and don’t slide down your nose.
- When you read, don’t move your eyes or head. Move the page or paper instead.
- Set your computer screen below eye level. You can achieve that by adjusting your desk or chair.
Japanese Charmant Group is one of the world's famous eyewear manufacturing enterprises. Since its inception in 1956, it has always been the leader of cutting-edge technology in the field of eyewear manufacturing. Charmant is a global titanium expert, and now the domestic market has launched 7 series of titanium, like Z titanium, etc., to meet the Chinese consumers’ pursuit of all ages for high-quality glasses and more comfortable glasses.
Among them, EX titanium is a patent developed by Charmant Group. Compared with common memory titanium, EX titanium has a more stable memory function and a more diversified design.The frame price of Charmant glasses is 1000 yuan above basically, from 1000 to 4000.
Is blue light blocking worth it?
There are two main problems with anti-blue glasses currently on the market. One is that the place to be prevented is not preventable, and the other is that people have color casts due to wrong protection and aggravate visual fatigue. Studies have shown that our eyes are the most intolerant of blue light in the 400-440 nanometer band. Therefore, current manufacturers mainly block blue light in this band when producing anti-blue glasses. However, the blue waveband of electronic products is between 450 nanometers and 490 nanometers, so most anti-blue glasses have little protection in this waveband. In addition, the blocking rate of anti-blue glasses is 20%~30% to achieve a good anti-blue light effect, but now the blocking rate of anti-blue glasses on the market has basically reached 80%~90%. All in all, these blocking blue light glasses cannot prevent the blue light in the 450-490 nanometer band, and their high blocking rate will also cause a color shift, which makes people more likely to have eye fatigue and headache.
In daily life, the intensity of blue light is low, not enough to cause damage to the fundus, so ordinary people do not need to wear anti-blue glasses unless they are working in extremely strong light conditions or working in special environments. To protect the eyes, it is more important for people to develop good eye habits. For example, wear a pair of suitable glasses and read insufficient light and at an appropriate distance. Avoid using electronic products for a long time. Take a break for 20 to 30 seconds every 20 to 30 minutes, and look at the distance regularly. If you have dry eyes while reading the electronic screen, remember to blink to 12 times per minute. It is best to wear sunglasses when outdoors.