How to Choose Reading Glasses?
In this section, we will show you some tips for choosing reading glasses.
Find the right power. When choosing reading glasses, finding the right power would be the most important thing. All reading glasses will have signs or stickers indicating their power. In most cases, they will range from +1 to +4 diopter, in increments of +0.25. So, when choosing reading glasses, try the lowest power first.
Test-drive the glasses. If you have brought reading material with you, try reading it at a comfortable length. If you hold the material too far out to be able to read it, you should increase the power. Keep testing the differences powers until can read clearly at the distance that’s more comfortable for you.
Choose big frames the first time. When choosing reading glasses, you can choose the big frames for the first time. You may need larger glasses frames or lenses to really get the sweet spot of where the prescription is.
And if you have never worn glasses for eye conditions such as nearsightedness, farsightedness or astigmatism, it is likely you will be able to see well with non-prescription reading glasses. So, you can buy these non-prescription reading glasses.
The refractive index of lens
Refraction law is discovered by Dutch mathematician Snell.It is the law that determines the direction of refracted light in the phenomenon of light refraction. When the light from the first medium (refractive index N1) into the second medium (refractive index N2), part of the light from the first medium into the second medium at the smooth interface will be refracted. The index of refraction is the ratio of the speed at which light travels in a vacuum to the speed at which light travels in the medium. For glasses lenses, the higher the refractive index, the thinner the lens, that is, the lens with the same center thickness and the same degree, the lens with the higher refractive index has thinner edges than the lens with the lower refractive index of the same material.
Pure Titanium Glasses Frame Brand - Perspicilla
Perspicilla is a company specializing in the business of myopia frames, pure titanium frames, optical shops, titanium glasses, and other products.It is a limited liability company and has professional design and production of different styles of 3D glasses.It is a professional product design company.The wonderful design team and professional production team hope to bring customers the most satisfactory products.In the production of the product, the brand adheres to the perfect integration of progressive technology and high-quality raw materials, so its single product not only has excellent quality, and comfort is done well.
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.
How long will the titanium frame last?
Titanium and titanium alloys are often used to make the most durable frames. Their strength is comparable to that of stainless steel. Medical facilities use titanium to make medical implants such as heart valves, showing just how durable the metal can be in extreme environments. Look at the maintenance between quality and use. Good glasses electroplating after three processes, the first is in the glasses or pure raw materials, plating a layer of an adhesion layer, used to attach the plating color layer. The second is the electroplating color layer. The third one is that after the electroplating color layer, another layer of electroplating protection is transparent. The electroplating of glasses through three processes can ensure that the glasses are not easy to lose color and damage in about 5 years. Now the glasses electroplating basically omits the processing of the last layer of the color protective layer, so the service life is about 3 years.
The categories of rimless glasses
Rimless glasses can be divided into metal rimless glasses and plastic rimless glasses according to the material. According to the metal category, they can be divided into nickel-copper alloy, memory titanium alloy rimless frames.
According to the elastic order of the frame, the softest and elastic kind is the plastic rimless glasses. The benefits are the lightest weight and the lowest price. The disadvantages are the short service life, faded look after the sun, and single appearance, which are suitable for children or teenagers in the stage of corrective treatment. The second elasticity is the memory titanium alloy rimless frame. They use aviation metal titanium as the raw material, suitable for people with sensitive skin, and have lighter quality, better durability, more styles.
Why do you need to wear safety goggles correctly?
Eye strain occurs when muscles are tired from strenuous exercise (from tension to concentration), similar to what happens to other muscles in the body from strenuous exercise or overuse. Eyestrain is the result of eye pain and fatigue, often accompanied by headaches. Eye strain has a lot to do with the quality of your glasses. If you wear cheap and inferior safety glasses for hours at work, you will feel uncomfortable. While your eyes won't be permanently damaged by fatigue, it can affect your productivity.