What is the best lens material?
The world's first resin lens was made of CR-39 material, and CR-39 is still the main optical lens material in Europe and the United States. After the end of World War II, people found that compared with glass, the main lens material at that time, the light transmittance of CR-39 is high, and it can block ultraviolet light. In addition, CR-39 can be dyed, not easy to fog, and has small dispersion (CR-39's Abbe number is 58) and other benefits.
Which is better：the silicone nose pad or the air cushion nose pad?
Although the air cushion nose pad is more flexible and has less pressure, in the process of actual use, the pressure on the bridge of the nose is not much different from that of an ordinary silicone nose pad. And because of the hollow design of the air cushion nose pad, the material on the front surface is easily damaged due to lack of thickness. If not taken care of, the metal nose brace can be directly applied to the bridge of the nose. if do not pay attention to the cause metal stents directly affect the bridge of the nose, with bad security. And the hollow design will bring dirty things, so it is easy to get dirty, affecting the image.
Disadvantages of Progressive Lens
There are deformation areas under the left and right sides of the lens, which make the image blurry and irregular. It takes 1-3 weeks to get used to it. In addition, it has a narrower field of view in the near and middle distances, and long-term concentration on the narrow focal point can easily make the eyes tired. Suitable for people who need to alternate between distant, medium, and near vision.
However, with the development of science and technology, more and more progressive multifocal glasses have emerged that have a wider field of view, more comfortable wearing, and better meet the needs of eyes. Nowadays, the use rate of progressive lenses among middle-aged and elderly people abroad is quite high. Single-lens and double-lens reading glasses are gradually being replaced by progressive multifocal glasses.
Silhouette Dynamics Colorwave 5500 BJ 6660
The Contoured Dynamic Colorwave 5500 BJ glasses come with a solid metal frame. Prescription lenses for SmartBuyGlasses are a great option so that your glasses are ready to wear. The lenses are coated with a special premium coating that makes them anti-glare and scratch-resistant. The contour dynamic color wave 5500 BJ glasses feature a gray frame and standard lens. The simplicity of rimless glasses is not that easy to create. Innovation plays a role in every rimless style. A focus on craftsmanship excellence and self-imposed high standards are part of this enduring manufacturer's legacy.
Semi-rimless glasses are easier to clean and maintain
Semi-rimless glasses usually have only half of the glass frame. We tend to wipe our glasses in one direction, but we all know that the glasses are all wrapped up. So when some small particles appear on our glasses, these things can not be wiped out by the glasses cloth, and it is easy to scratch the lens. This is one of the drawbacks of full-frame glasses.
MODELE makes each pair of glasses with the attitude of creating artworks. The fastidiousness of materials and strict requirements on details is the premise and warranty for MODELE to enter the high-end field. The temples of MODELE glasses are made of natural cattle horn, which is made by three processes with a comfortable feel and warm color. The nose pad is made of natural jade powder to design the proper radian of the human nose bridge and reduce the pressure on the nose bridge. The special jade powder material can more effectively inhibit the growth of bacteria.
Acetate cellulose pellets are extruded by an injection molding machine, which is called an injection frame. Its characteristic is that it saves raw materials, can be mass-produced, has a lower cost, and is cheaper than a plate rack. But the firmness is not as good as the plate frame. However, injection frames are mostly used for glasses for the elderly and children because of their lightweight and resistance to allergies. The injection frame is made of laminated plastic. It is made by pasting a thin layer of plastic of one color on another thicker layer of plastic. Thick materials are mostly transparent pigments. It is also made of three or more layers of plastic.