Whether glasses are better with glass lenses or plastic

Plastic good glass falls fragile.

First of all, let's talk about the advantages and disadvantages of resin sheets.

Advantages of resin sheet: light weight, not broken, impact resistance, low hardness, easy to be grinded.

Disadvantages of resin sheet: thicker than glass sheet of the same degree, not resistant to high temperature, low density, easy to yellow, high refractive index lens**.

Advantages of glass sheets: better light transmittance, up to more than 99%, high density, the lens is much thinner than the resin sheet of the same degree, the lens is not easy to yellowing after a long time, the service life is relatively long, cheap, the hardness is higher, and it is not suitable for grinding.

Disadvantages of glass sheets: fragile, heavier than resin sheets, if your degree is not high about 300 degrees, then glass sheets and resin sheets can be selected. It's just that the glass ones will be heavier, the lenses are fragile, and the glass ones can't be made into rimless and half-rimmed glasses, so they can only be selected in the whole frame. If it is mixed with resin, it will be much lighter than the glass sheet, and the thickness will be slightly thicker.

There is no restriction on the frame of the resin lens, and the frameless half frame and full frame can be selected.

If you have a power of more than 6, you can still choose plastic lenses, but you should choose lenses with a high refractive index, which will look thinner than ordinary resin lenses. But it's also a little bit higher. The glass one can only be equipped with a full frame, and the weight will be a little heavier.

If it is more than 1,000 degrees, then I still recommend you to use a glass sheet, because the difference between the thickness of the glass and the thickness of the resin sheet is very obvious. If you use resin sheets, you can't say that it's thick...

I don't say what lenses are good or what lenses are not, the key is to see which aspect you pay attention to. However, now that resin lenses account for more than 95% of the market, glass lenses are becoming more and more difficult to buy. Now resin sheets are already the mainstream. The days of glass are over...

Moreover, I am very experienced, I myself have been using resin tablets for many years, except for the lost ones, there are no broken ones!

Nowadays, most of them are resins.

The plastic grease is better, and it is not easy to hurt the eyes when it is broken by external forces.

As follows:

Advantages and disadvantages of metal-framed glasses:

1. Fashionable appearance. ** And the intellectuals and young and promising chairmen in the TV series are all images of gold wire glasses, and the wide plastic frames are either entertainment stars or comic silk, literary and artistic youths.

2. The frame is small and easy to clean, and the wire pulling process can be used when installing the lenses, and the frame can be brushed with a brush when cleaning.

3. The nose pads are durable and flexible to adjust. The nose bracket of the metal frame is welded directly to the frame, which is only sturdy, and it is also very convenient to adjust the book, and the glasses are not easy to slide down.

4. The quality of low-end metal frames is poor. If it is a low-end metal frame, the shortcomings such as corrosion, rust, fading, allergies, and temple hair shafts will become more and more obvious. If the budget is not enough, it is better to buy a plastic frame directly.

5. Easy to deform. Metal frames, frames, nose pads and other parts are easy to deform, so you should put them in a safe place when sleeping at night, in case you press them to the point that they will not be scrapped, it will be very awkward.

Advantages and disadvantages of plastic frames:

1. Comfortable and lightweight. Even the lowest-end plastic frame is relatively light and comfortable.

2. Rich colors and different shapes. Plastic is easy to shape and comes in a variety of colours, with plastic frames in different shapes and colours that can be used to make a statement.

3. Corrosion-resistant, strong and anti-manufacturing. The plastic frame does not have to worry about rust, corrosion, color fading and other problems, and it can be put casually when sleeping at night, and it will not be deformed if you accidentally step on the ground.

4. The frame is large and not easy to clean. The plastic material is softer, and the grooves on the edges of the frame are relatively wider and deeper, making it a little laborious to clean up after accumulating dirt.

5. It is inconvenient to adjust the nose pads. The nose pads of many plastic frames cannot be adjusted, and even if they can be adjusted, the durability is worrying, so most plastic frames are easier to slip off the bridge of the nose than metal frames, and you may have to use your hands frequently to support them during use.

Which is better, metal frame or plastic frame.

1. Personal preference. Materials and craftsmanship are constantly evolving, and both metal and plastic frames have excellent pieces full of personality. If you love a certain frame and don't care, just buy it, as long as the quality is good and the money is in place, the shortcomings mentioned above are not a problem.

2. Cost of construction. High-quality frames, whether they are plastic frames or gold frames, have no problem with use, and generally do not have inferior quality problems. But if it is an entry frame under 100 yuan, a single item made of plastic can make people more assured.

3. Usage habits. If you are an informal person and glasses are often thrown away at will, it is recommended to buy plastic frames to worry about it, and you don't have to worry about the deformation, corrosion and fading of the frame.

Plastic lenses are good. Because the plastic lens is light and thin, for patients with a large degree of myopia, you can consider choosing plastic lenses, which have a high refractive index, can be made thinner, and the weight is relatively light, and the wearing comfort is better.

Features of plastic lensesIt can prevent dents, and the general high-heat and small-volume substances are easy to cause dents and spots in the glass sheet, but if it touches the plastic lens, it will automatically pop open, and will not cause any marks on the surface of the lens.

The thermal conductivity of anti-fog plastic lenses is lower than that of glass, and it is not easy to produce blurred phenomena due to steam and hot water, and even if it is blurred, it will fade quickly, and it can block ultraviolet rays almost completely and completely block ultraviolet rays with a wavelength of less than 350mm, and the effect is far better than that of glass lenses.

The material of glass is made up of three main parts: the basic raw material, the flux and the colorant, as well as the decolorizer, the clarifier and the emulsion.

The basic raw material for glass making.

Silica is the most important raw material for glass production. The reserves of silica on the earth are very large. Silica is the main raw material for stone and the main raw material for making glass.

The silicon content of different stones is different. These materials are the most common in our lives.

flux. The melting point of silica is very high, and it is very limited to achieve this honor. The ancients tried to add some other substances, and when it melted, the temperature became lower. In addition, the silica melts very abruptly, and there is no filter transition stage that gradually softens during the heating process, and after fusing some other substances, the glass can be in various glorious states at different temperatures, and the glass can be effectively shaped and shaped.

This substance is the flux.

The flux is usually a raw material containing sodium oxide, potassium oxide, lead oxide, calcium oxide, barium oxide and other substances, such as limestone, feldspar, soda ash, boric acid, lead compounds, and barium compounds. (Sodium oxide can reduce the viscosity in the formation of glass, make the glass easy to melt, and play a good role in fluxing; Barium oxide plays a fundamental role with sodium oxide in the formation of glass; Tin oxide can increase the chemical stability and mechanical strength of glass; Lead oxide can increase density, improve serpentine, and have a special luster; Lead can make the glass have a large refractive index to light and a small scattering rate, making the glass more shiny and stable.

Clarifier. Some bubbles will appear in the process of making glass, and the clarifier used to reduce these bubbles is used. The main commonly used are arsenic oxide, antimony oxide and nitrate.

Emulsion. In the production of glass, the artist makes the glass opaque according to the requirements of the work, and the emulsion is the emulsion that makes the glass opaque. It can cause glass to produce crystalline or unfixed colloidal particles that differ from the refractive index of the glass itself to produce an opaque effect. Commonly used emulsions are tin oxide, antimony oxide, and phosphate.

Decolorizing agent. The head colorant is mainly used to eliminate the undesirable color brought by the impurities in the raw materials to the glass, so that the glass city is colorless and transparent. There are two main types of chemical decolorizing agents and physical decolorizing agents, and chemical decolorizing agents usually disappear through oxidation, mainly sodium nitrate and potassium nitrate. Physical decolorizers make glass colorless by producing complementary colors, mainly manganese dioxide, selenium and cobalt oxide, and bromine oxide.