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Fri, Apr 08, 22 By : Koalaeye
Single Vision vs Progressive: What Are Their Differences In this part, we will show you some differences between single vision and progressive lenses. They differ in several factors, so here we will compare them one by one. Progressive lenses generally have their reading zones just in the lower half of the lenses, while single vision glasses have the reading power all over the lens. So if you are working on something above your head and you need to see some...

Single Vision vs Progressive: What Are Their Differences

In this part, we will show you some differences between single vision and progressive lenses. They differ in several factors, so here we will compare them one by one.

Progressive lenses generally have their reading zones just in the lower half of the lenses, while single vision glasses have the reading power all over the lens. So if you are working on something above your head and you need to see some small details, the progressive lenses will not work. And you can not see through the reading zone in progressive you need to switch to single vision reading glasses.

Single vision glasses are cheap than progressive lenses. Compared to progressive glasses, single vision glasses hold way fewer distortions in the periphery. So, there is no need to customize the lens design to the max. In addition, single vision glasses are often available in the optical store while the progressive often needs to be produced for you. In other words, the delivery time of single vision lenses will be shorter for you.

You can use your progressive glasses optimally just in an upright posture. As soon as you lay down on your couch, this will lead to blurry vision. The reason is your changed position which forces you to look lower through the lenses on the screen. However, with single vision glasses, you can change to an upright position and it would not be a problem anymore. You can position yourself on your couch as comfortably as you want and you can still see clearly with your single vision distance glasses.


Women's glasses are increasingly fashionable.

As for the color, there are a variety of metallic colors, unreal colors, transparent or translucent tones. The frame design is gorgeous and dazzling. There is an implicit low-key style with the brand logo embedded in the frame. Many models combine two or more materials, such as metals and plastics, in a unique way. There are both very bright colors and natural hues, with a wide selection.



RIVBOS Polarized Sports Sunglasses for Driving

TAC Polarizing Lenses - RIVBOS lenses are made from cellulose triacetate (TAC) material. TAC has quality optical properties that prevent the shrinkage of PVA polarized light film and has high strength surface scratch resistance. They help restore the original color, eliminate reflected and scattered light, and provide perfect eye protection. Rivbos frames are made from durable TR90 material. These polarized sunglasses feature flexible, stress-resistant frames that are able to withstand pressure without breaking. Whether it's sports or casual, you can show off your unique style.


Choose rectangular glasses based on the shape of your face.

If you belong to the oval face, do not choose the too large or angular glasses frame. And do not choose long or square ones. It will be easy to elongate the face and affect the overall appearance. The shape of a round face is the opposite of a square face, so the buying principle of the glasses is basically the opposite of a square face. You need a more angular one to improve the shape of the face, but you need a square face (elongate) principle, that is, use a lower height, higher temple position of the frame.



Type of eyeglasses cloth

There are many kinds of cloth for glasses. There is mainly sheepskin eyewear cloth, and there is microfiber eyewear cloth. There are suede and double-sided cloth and so on. Professional eyewear cloth must use more than 200 grams of weight/per cubic centimeter of microfiber. This kind of raw material chemical fiber is fine, and tactility is soft, so it will not damage the lens. This kind of wipe cloth can be used on a computer screen. The two sides of the cloth are different, and the smooth side is used to scrub the lenses. Because the dirt on the lens is mostly small. The rough side is designed to give you more friction when you touch it with your finger, so you can use it more easily, and you can clean it more.


5 Unbreakable Eyeglasses Frames

In this section, we will list the most durable eyeglasses frames and we will introduce them one by one.

Titanium: One of the most durable eyeglasses frames is the titanium eyeglasses frames. It is lightweight, strong, and flexible. So, titanium eyeglasses frames have lots of fans in the eyeglasses market. In addition, pure titanium is hypoallergenic. But, due to these features, titanium eyeglasses frames are expensive than other frames.

Stainless steel: Stainless steel frames have some spring in them, which resists breakage. Stainless steel also resists corrosion, giving it a longer life. However, stainless steel eyeglasses frames may be hypoallergenic, depending on the alloys used.

Nylon: many people like athletes like nylon frames because they are flexible, lightweight and unbreakable - at least in the short run. However, nylon frames may become brittle over time, which is something to think about.

Kevlar: kevlar eyeglasses frames used in bulletproof vests can survive strong impacts, making them a good choice for contact sports and high-risk jobs. It does not have a lot of flex, limiting its applications.

Flexon: besides the above unbreakable eyeglasses frame, we will introduce another brand-name metal - Flexon. Flexon has a unique capability for springing back to its original shape after it gets twisted and they are called memory metal.



Titanium frame machining is complicated.

The elastic modulus of titanium alloy is small, which is easy to produce large deformation, springback, distortion, and vibration in cutting, resulting in poor geometric shape and accuracy of the workpiece. As the surface roughness increases, the tool wear increases. The thermal conductivity of titanium alloy is poor and its thermal conductivity is small, 1/6 of that of 45 steel, so the high heat generated in processing cannot be effectively diffused. It is even harder to use titanium to make glasses. The frames are very thin and a lot of fine work is demanded. It's definitely a challenge for titanium, which is pretty difficult to work with. In addition, titanium alloy frames involve titanium alloy welding technology, which is more difficult.

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