where can i get cheap prescription glasses?
Sat, Apr 09, 22 By : Koalaeye
The refractive index of the lens is related to the thickness of the lens. The main factors that determine if a pair of finished glasses are beautiful, portable, and comfortable depending on the thickness and thinness of the processed lenses. Depending on the material, the index of refraction is different. If you just look at the refractive index, the higher the refractive index at the same degree, the thinner the lens will be. The thinner the lens will be, and...

The refractive index of the lens is related to the thickness of the lens.

The main factors that determine if a pair of finished glasses are beautiful, portable, and comfortable depending on the thickness and thinness of the processed lenses. Depending on the material, the index of refraction is different. If you just look at the refractive index, the higher the refractive index at the same degree, the thinner the lens will be. The thinner the lens will be, and the more beautiful the lens will be. However, the higher the refractive index, it is not the better. You can choose the refractive index lens suitable for yourself. But the refractive index is not the only factor that determines lens thickness. Think about the distance between your eyes and the size of the frames you choose, which can affect the thickness of the lenses you match. The larger the pupil distance, the smaller the frame, and the thinner the lens.


About industrial pure titanium

For the industrial pure titanium, titanium content is not less than 98%, containing a small amount of oxygen, nitrogen, hydrogen, carbon, silicon, and iron impurities such as dense metal. The labels are TA1,TA2,TA3,TA4. It's arranged by more and more impurities. The TA1 titanium content is more than 99.5%, and the price is not high. But no matter which links, for molding, welding, polishing, processing difficulty is very great.The price of almost all titanium alloys in the national standard is higher than that of pure titanium.

In reality, the price of β titanium is higher than pure titanium. Pure titanium is almost no elastic, but β titanium is not only elastic, and has the advantages of ultra-light corrosion resistance. β titanium does not have a specific composition. Memory titanium can cost tens or even tens of times as much as pure titanium.

Using memory alloy to make glasses frame is the use of its superelastic characteristics at a certain temperature (elasticity is several times that of stainless steel) and did not use its memory function. Compared to beta-titanium, memory titanium is so difficult to process. It is so elastic that shaping is difficult and impossible at room temperature, and memory titanium heat treatment is another difficult and even secret process.



Is it necessary to repair the glasses that are badly damaged?

If your glasses are badly damaged, think about getting a new pair. Maintenance is maintenance, not a replacement, so there are some traces of maintenance. The repair cost is far more than or can buy a new pair of glasses, so there is no need to repair them. For the kind of alloy that's used for cheap glasses and the kind of alloy that's used for high-end glasses, the texture of the welding is so different. There are differences in intensity. In order to make the cheap glasses strong after welding, it will definitely increase the welding marks (solder repair, etc.), so the marks will be obvious.


Which is better, Essilor lens or Zeiss lens?

1. Different high-density resin substrates. Essilor Diamond Crystal series 1.74 lenses use resin with a density of 1.46 as raw materials. The lens itself has higher hardness. Combined with Diamond Crystal series film layers, the lifespan of the lens is better improved. The outstanding abrasion resistance is obvious.

2. Different technical support. The greater the density of the lens, the harder the substrate. However, the larger the density of the lens under the same volume is heavier. Therefore, Zeiss has the best trade-off between density and component and selects high density on the basis of high refractive index and frivolity substrates.

3. Different Features. The anti-fog molecules on the two surfaces of the lens are activated by an anti-fog activator. Therefore, the fog differentiates into a thin layer that is invisible to the eyes, instead of forming a fog. Each spray of activator can last about a week. Zeiss resin lens guarantees up to 99.4% of the lens light transmittance, and the naked eye can no longer feel whether the lens is worn or not.



Features of pure titanium glasses frame

Due to the lightweight (ordinary nickel-based alloy frame weight 48%-60%), high strength, corrosion resistance, surface easy coloring, beautiful and durable features of spectacle frame made of pure titanium, they have been loved by most consumers. But the elastic modulus of pure titanium is higher (about 120GPa). The temples of the frames made from them are not elastic enough. After wearing the glasses for a period of time, the temples of the glasses need to be adjusted due to the relaxation of the stress. The processing plasticity of titanium metal is worse than that of other metal materials, so the processing technology of its wire is difficult. The surface quality is difficult to control, and the technical content is high. The surface quality of pure titanium wire produced by a few domestic manufacturers is poor.


What Are Polycarbonate Lenses?

Polycarbonate lenses are made from a type of plastic that is famous for its durability. Polycarbonate lenses are perfect for those who are doing sports while wearing glasses. It is also used in children’s glasses since kids are much less careful with their glasses than adults.



How to buy plano lens?

You had better not buy off-the-shelf plano lens, buy by fixed matching, just like matching with myopic glasses. The price is much more expensive than the finished product. However, the quality of the finished glasses is not guaranteed, and the materials are also poor, which is not only not helpful to you, but harmful for a long time. There is no essential difference between degrees and workmanship technology for the lenses, what should choose is the brand lens film of the lens, and the transmittance of the lens, and the design technology of the lens, to buy a good lens (including smooth lens).

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