Is the lens good or bad hereditary myopia with glasses

Hello, I am a military optical manufacturer distributor.

Those so-called all kinds of nouns are useless.

Although plastic lenses are not as good as glass lenses, they are safer and are not easy to break the eyes, so resin is recommended.

Regarding spectacle lenses, what "imported", "film", "anti-radiation" and "what focus", you don't need to care, just buy domestic ordinary resin lenses. What is imported, it is all domestic, the purchase price is the same, and they charge you dozens more.

Ear problems, this should not be difficult, just adjust the glasses frame theoretically. But who knows if they do it or not. Simple, but also a bit cumbersome.

Glasses play a role in correcting vision, and lenses are also good and bad Now it is generally the choice of resin, mainly light weight, comfortable to wear, hard resin is not easy to scratch, it is best to choose hard resin coating, what other radiation protection is not important.

Glasses are generally 100 150 to buy a good one, too expensive and not cost-effective.

It doesn't matter if the left and right ears are not the same height, the glasses can be adjusted.

The lenses in the optical store are divided into glass lenses and plastic lenses, and the characteristic of glass lenses is that they will break when they fall to the ground, and they will be very heavy to carry, which will bring a certain amount of pressure to the nose. Plastic lenses are lighter, but plastic lenses are easy to wear, and you will not see clearly when the time comes, so you can do more eye exercises when you have time.

There are good and bad spectacle lenses. Ways to tell if your glasses are good or bad:

Test the transparency and optical uniformity of the lens: if the hand-held lens is about 30 cm away from the front of the eye, observe the distant scene from the lens, if the scene is clear, there is no deformation, and there is no jump when moving slowly, it means that the transparency and light uniformity of the lens are good.

Determine the axial direction of the astigmatism lens: rotate the lens 30 cm on the cross pattern, and when the cross strokes on the inside and outside of the lens are connected, the axis of the cylinder lens is the same as the straight line. Move the lens in a straight line repeatedly to see which line is more staggered from the straight line outside the lens when moving, which is the direction of the astigmatism axis.

Move the lens so that the inside and outside are aligned in a straight line, in this case the astigmatism axis.

Lenses are real, the key is how to check, as an ordinary consumer, mastering the simple and easy method is the key.

The first thing to know is what lenses are good lenses:

High-quality lenses: 1. High definition. Its light transmittance is very high, and some are comparable to microscopes for neurosurgery. Such as Zeiss in Germany.

2. Less reflection. This is a prerequisite for high light transmittance, with low reflection and high comfort.

3. It is not easy to fog up.

4. Easy to clean. The lens shows that it is smooth and easy to clean, 5. It is dirt-resistant and not easy to absorb dust and oil.

6. Long service life. (This is difficult to identify easily, and it can only be reflected through various rigorous tests).

So now we can talk about inspection.

First of all, choose a clean facial tissue and wipe the surface of the lens in one direction, the smoother the lens surface, the better the lens. The smooth surface lenses are less prone to oil and dust, and at the same time, they are easy to clean, and the wiping lenses are not easy to wear and tear the lenses.

Secondly, observe the brightness of the light reflection on the surface of the lens, the less reflective the lens, the better.

Again, put a piece of white paper under the lens, the same power of the lens, the closer the white paper is to the primary color, the better, and the clearer the white, the better.

Others, such as aspherical lenses, are better than spherical, and high-end lenses are aspherical, and the cost difference is not very large. Tinted lenses change color quickly and slowly, and the base color is dark; Progressive lenses, channel width, field of view, size, and more.

If you have any special questions, you can ask me.

Qualifications: National first-class senior optometry technician Zhejiang Huangyan Fumin glasses.

1.In terms of workmanship, carefully observe the workmanship of the glasses, such as whether the parts of the glasses are firm, and whether the glasses lenses are smooth and free of scratches.

2.Product informationRegular glasses manufacturers will mark the manufacturer's information, brand and other information, so you can check whether the glasses have these relevant information, and whether this information is really prepared.

3.Glass-quality spectacle lenses are generally reflective, and if the color of the reflection is green, then the spectacle lenses are made of ordinary glass.

4.If there is no dizziness and vomiting, then the eye is better, and if the prescription of the spectacle lens is too high, then there will be a bad phenomenon.

To put it simply, the qualified metal frame has a good surface finish, no scratches, the size of the two rings is the same, the parts are finely worked, and the welding points are delicate. A high-quality plastic frame should be soft and hard, with moderate hand strength. The glasses frames produced by regular manufacturers are marked with specifications, sizes, brands and other words; Lenses made of ordinary glass, more green when viewed from the side, this kind of glass has low light transmittance, uneven material, contains more impurities, stripes, bubbles, etc., and is mostly plano-convex or flat-concave type.

The lens shape of high-quality glasses should be regular, and there should be no spiral shape and huo light. The identification method is to put the two-handed frame in front of the eyes, the lens is convex outward, move slowly up and down, and observe distant objects from the lens, if most of the objects are stationary, but there is a corrugated beating phenomenon locally, it means that the surface of the lens is uneven, and there is Huo Guang. We are happy to serve you and hope to help you.

There must be good and bad, that's for sure.

Because of the different materials, materials and functions, there will be different grades of lenses.

Plastic lenses: Plastic lenses are a type of optical lens made of resin. So now I use it a lot.

Crystal lenses: As an optical material, the biggest advantage of crystal is that it is hard, and the lenses made are not easy to wear, but they are expensive.

PC lenses: PC lenses have the advantages of light weight, high impact strength, high hardness, high refractive index, good mechanical properties, good thermoplasticity, good electrical insulation properties, and no pollution to the environment.

Absolutely. According to its surface structure, there are spherical lenses, aspherical lenses, and double-sided aspherical lenses. There are various different refractive index ,,, and so on.

There are plastic lenses, glass lenses, PC lenses, etc., according to the coating process, and there are various coating layers according to the coating process. There are also different lens manufacturing processes from different manufacturers. However, the most important difference between the quality of lenses in the industry is the lens coating process.

Hello, Mirror Tablets. The best lenses are German Zeiss lenses, of course, there are also high-end and DAO low-end, followed by French Escher.

Brands such as roads, and then some third-rate brands. The quality of the lens is determined by the substrate and coating, Zeiss lenses are very expensive, mainly on the lotus film, a good coating makes the lens not easy to be contaminated with dust, increase light transmittance, prevent glare, and not easy to age; The processing of the substrate determines whether the light transmittance and power of the lens are accurate. Another important parameter of the substrate is the refractive index, the highest refractive index at present, followed by the higher the refractive index, the thinner the lens of the same power, and the more comfortable it is to wear.

In addition, the mainstream lenses are already aspherical designs, and the front of the aspherical lens is a curved surface similar to a flat surface, which has the advantage of being smaller than ordinary spherical lenses.

First of all, it depends on what product you are with, some products are marked with the manufacturer.

Logo, it can be directly seen that most of the brands on the face of the domestic market are non-counterfeiting logos, and there are many brands.

Secondly, when it comes to well-known brands, it is best not to bargain too much, I personally believe that merchants will not make less money on a product, and small profits and quick sales are just the idea of consumption, so it is also the slogan of the business. Therefore, it is difficult for you to guarantee that the product is the original thing if you give less money, and it is difficult for the first-line brand sales terminal to make a lot of money, so they have no decision-making power at all, and you are not an expert after all, and people have to make money.

Let's talk about non-well-known brands. There are too many products for this product, and the series is different for each merchant's hour. What consumers can do is to listen to what they have to say about the gap between these products, and if the sales can't tell the reason, it is recommended that you buy a cheap one.

I don't know whether my product is good or bad, how can you choose? If you can tell the good or bad, it depends on your situation to see how much you can discount, and the feeling of personal consumption is, don't be too fast, otherwise it will be difficult to do it in the future, you know.

Finally, be specific about what price you can accept and choose what price. Don't climb high, remember, don't compare.

(1) Inspector.

Sitting facing the patient at a distance of 40 cm keeps the two people's eyes at the same height. Version (2) The examiner holds the interpupillary ruler or ruler with the thumb and index finger of the right hand, rests the remaining fingers on the patient's cheek, and then places the interpupillary ruler at the lowest point of the bridge of the nose and slightly inclines along the angle of the bridge of the nose.

3) The examiner closes the right eye, makes the patient look at the left eye, and uses the left eye to fix the "zero" position of the interpupillary distance ruler at the center of the pupil of the patient's right eye.

4) The examiner opens the right eye, still asks the patient to continue to look at the left eye, and uses the right eye to read the value in the center of the pupil of the patient's left eye.

5) Repeat steps (3) and (4) three times, taking the average of them as the near interpupillary distance.

Lenses are a personalized product. Therefore, the lens is a very complex thing, and it is not easy to judge whether the lens is good or bad.

There are many parameters of lenses, simply put, the quality of lenses can refer to ISO8090 series international standards, GB10810 series national standards, as well as industry standards QB2506-2001, coating standards QB2682-2005, QB T2702-2005, etc.

But these standards are far from sufficient. Because there are some key parameters that are not yet standardized. Neither international, domestic, nor in the industry.

But they are really the key parameters. And these parameters are much more important than the so-called UV protection, water resistance, fog resistance, easy care and so on. For example, there is no standard for the face shape of the lenses and the design of the lenses, but they are crucial parameters that directly affect the wearer's comfort (or whether it is easy to get tired, whether it is easier to see clearly, whether it is easy to be dizzy, whether it is easy to hurt and tear, etc.).

Different designs may be suitable for different occasions and suitable for different groups of people. Even different designs are suitable for different eye habits ......There are no standards for these. Just as there is no standard for TCM, he must give specific prescriptions based on the individual's specific situation.

People have a lot of personalized things, and there is no way to unify them. For more information about the personalization of glasses, you can refer to the article "Personalized You, Personalized Lenses" in my library.

Regarding the face shape of the lens, for example, the simplest spherical single vision lens (single vision) has a spherical front surface and a spherical back surface. When measuring the power, the power of the optical center is detected, but can you guarantee that the lens is still spherical when the lens is in the large area away from the optical center of the lens? Do you still need the degree?

You don't know, do you? The best thing to do at this point is to inspect the entire face. However, there is no internationally recognized testing instrument.

Not to mention the standard.

It's just that some foreign large factories may conduct regular testing of molds and correct molds that do not meet their enterprise standards, but many domestic manufacturers may only test once for a longer time, or relax the qualified enterprise standards, or do not test at all. So the cost naturally goes down, and you can't say he's unqualified: you measure the center of light with a focimeter, and the power is not bad at all!

These differences, some domestic manufacturers may know but deliberately relax for cost considerations, and even more may not understand many manufacturers themselves! They just buy the mold and buy the lenses directly after they are ready.

In addition, there are parameters such as the lens material that may be birefringent or polyrefringent during the manufacturing process (usually said to have internal stresses), which cannot be directly seen with the naked eye. Similarly, the standards for lenses are not specified or mentioned. However, some manufacturers may test this, but they also do not have a standard.

It's easy to make lenses, but it's hard to do them well, if you don't understand the manufacturing process of lenses, and at the same time, you don't understand the process management level of lens manufacturers, and you don't understand the manufacturer's quality control methods, it is also difficult to judge the quality of lenses.

There are so many parameters to measure the quality of lenses, and I think about writing as much as I want.

Hardness: The harder the better, some optical stores have samples, one side is an ordinary film and the other is a hard film, use a small steel wool ball for you to scratch, of course, the hardness is good on the side that does not spend. It's only when you wear glasses that you know if it's good or not.

UV protection factor: UV value indication. The best one is UV400, which is generally UV375This optical shop has instrumental testing.

Radiation protection: This is also tested by instruments, and it is best to prevent it.

Abbe number: The bigger, the better. The Abbe number is an inverse proportional exponent of the dispersion capacity of a transparent substance, and the smaller the value, the greater the dispersion.

The Abbe number of the material of ophthalmic optical lenses is generally between 30 and 60. In general, there is a rule: the greater the refractive index of the material, the greater the dispersion, i.e., the lower the Abbe number.

Lenses below the refractive index do not need to be considered.

Refractive index: The higher the refractive index, the thinner the lens will be for the same power.

Firmness of the film: the firmer the better, the detection method is to boil the lens in saturated salt water, and the longer it can last, the better.

In addition, the color of the coating is not directly related to the failure of the coating layer.

Those who are prone to allergies should choose their frames carefully.

Some people's ** are prone to allergies after contact with metals, and some people's sweat secretion is strong, which corrodes metals severely. It is best for such people to wear glasses not to choose general metal frames, but to choose plastic or composite frames. It is best to choose the temples with plastic wraps and the lower half of the rim brushed.

In addition, the metal frame of pure titanium has strong corrosion resistance, and the weight is about 40% lighter than that of the general metal frame, which is an ideal choice for people who are prone to allergies** wearing glasses, but it is also more expensive. Wish.