Questions about myopia lenses What are the lenses for myopia glasses and farsightedness?

The choice of lenses for children's myopia, how to be myopic in their 40s**.

1. The lenses of all myopia glasses and farsighted glasses are lenses, and the myopia glasses are thin and thick; Farsighted glasses** thick with thin edges. The lens used for myopia is called a concave lens; The lens used for hyperopia is called a convex lens.

Myopia is the ability to see clearly near and distant. Hyperopia is just the opposite, it is not clear to see the near and see the distance clearly, children with farsightedness are mostly born, and the later hyperopia is directly related to eye health, so whether it is myopia or farsightedness, the most important thing is to pay attention to eye hygiene, pay attention to diet, and do not use eyes for a long time.

The most direct way to determine whether you are nearsighted or farsighted is to refraction in the hospital, which can know exactly the specific condition of the eye and can treat it in a targeted manner.

Whether children under the age of 18 are nearsighted or farsighted, the most fundamental cause is the lack of vision nutrients. It is recommended to take Joy Vision Nutrients, take it with warm water, and insist on taking it for a period of time, and your vision will gradually be controlled or improved.

Whether it is myopia or farsightedness, if it is not treated in time, it will have a serious impact on future education and employment, so it is still necessary to pay attention to it.

Myopia lenses are concave lenses, that is, thin in the middle and thick around the periphery, and hyperopia lenses are convex lenses, thick in the middle and thin in the periphery, all in order to make the focus on the retina image.

Myopia lenses are thin in the middle.

Thick farsightedness on both sides is the opposite.

1. Look at the lenses and choose the lenses carefully.

One to see whether the glasses company has obtained the glasses product production license;

Second, look at whether the optometry equipment and testing instruments of the glasses company have qualified marks;

Third, look at whether the optometry and production personnel are certified to work;

Fourth, look at whether the glasses have a qualified mark (certificate).

2. Choose the light frame.

For people with sensitive nose bridges, it is more in line with health needs to choose lighter plates or lightweight tungsten titanium and pure titanium.

If the prescription is relatively high, you can choose a smaller frame to reduce the weight of the glasses. You can also choose glasses with nose pads, which can reduce the weight on the bridge of the nose.

3. Lens material.

Glass lens: stable refractive index, good wear resistance, stable optical properties, but relatively heavy, easy to break.

Plastic lens (CR-39): lightweight, safe, high light transmittance, not easy to break, but the surface is easy to wear.

PC lenses: high refractive index and firm, but the surface is easy to wear.

4. Accurate refraction.

It is best to choose an optometry center or a more regular optician store for optometry.

5. Different groups of people.

High myopia: high refractive index should be purchased to reduce the thickness of the lens, and self-tinting lenses should not be selected;

Children and teenagers: It is advisable to choose optical resin lenses to ensure the safety of wearing;

General myopia: Patients should be fitted with slightly reddish optical lenses or slightly blue-purple optical lenses to ensure that most of the ultraviolet rays are blocked from the human eye.

People who often work in close proximity to computers can be equipped with anti-blue light, anti-fatigue, anti-blue light and anti-fatigue lenses.

If you often exercise outdoors, it is recommended to choose self-tinting lenses;

Lenses to alleviate the progression of myopia in children can choose from defocus design of full-focus lenses, ring focus, or adolescent progressive, etc.;

Driver: You can wear a pair of polarized glasses, etc.

Myopia glasses are not as expensive as possible, when wearing myopia glasses, you must go to a regular optometry center or optical store, under the advice of professionals, choose myopia glasses that are suitable for you, in order to prevent myopia from deepening.

When choosing myopia lenses, it is necessary to consider the applicability of the prescription, self-suitability and other factors to choose the right lens.

Choosing spectacle lenses for myopia should be looked at:

One to see whether the glasses company has obtained the glasses product production license;

Second, look at whether the optometry equipment and testing instruments of the glasses company have qualified marks;

Third, look at whether the optometry and production personnel are certified to work;

Fourth, look at whether the glasses have a qualified mark (certificate).

Lens material: light, safe, high light transmittance, not easy to break, but the surface is easy to wear. However, it is currently in high use.

Choose the one that suits you, not only to pay attention to the above, but also to consider the perfect after-sales service.

The purpose of myopia glasses is to allow people with myopia to see things clearly immediately, but they are not helpful for the recovery of myopia. Generally, myopia under the age of 18 is in the stage of vision development, and the adjustment of the eyes is strong. You can take medication in time to improve myopia.

It is recommended to take Joy Vision Nutrients, one sachet twice a day, and keep taking it, and the myopia will gradually decrease.

Classification will explain to you what material is suitable for what kind of candidate!

Optometry is the key to spectacles. The accuracy of refraction is related to the pass rate of myopic glasses produced. The diopter should be accurate first, and the distance between the left and right should not exceed the degree of the prescription; Secondly, the astigmatism axis should be accurate, and the axis difference should be limited to the middle of the positive and negative electrodes L-3 degrees; Finally, the interpupillary distance should be precise, specifying that the pupil distance is equivalent to the distance between the electron-optical management center of the lens.

If the optometry does not pay attention to the control points, the spectacle lens will cause vision loss, long-term eye vision fatigue, dizziness, nausea and vomiting, and even double vision***.

Below 1,300 degrees, it can be considered, and if it is thinner, it can be considered.

2,300-500 degrees, can be considered, to be thinner can be considered.

3,500-1,000 degrees Celsius, be thin, and consider it.

4,1000 degrees or more, consider, to be thinner, as long as the money is more.

When choosing a frame, the interaction with the lens should be taken into account: the larger the frame size, the larger the effective diameter of the frame, the larger the minimum lens blank required, and the thicker and heavier the trimmed lens accordingly.

Therefore, height lenses and aspherical lenses require small, symmetrical, round or square frames, and frames with a meridian that is too long are not suitable. Progressive lenses, on the other hand, need to have a frame of the appropriate height, i.e. a vertical distance of at least 22 mm from the center of the pupil to the bottom of the inner groove of the rim.

I don't know if you are wearing glasses, will you be confused by the dazzling lenses in the optical store? And there's nothing wrong with that. Nowadays, there are more and more lenses of various kinds on the market, and myopia is enough to worry about it, and you have to worry about choosing lenses.

In the cold winter, I'm here to send warmth! After reading my article, you don't have to worry about this problem anymore!

Spherical and aspherical lenses

In the case of conventional spherical lenses, objects around the lens are distorted. Aspherical lenses are designed to eliminate phase contrast, so the biggest advantage of aspherical lenses is to reduce phase contrast, which is manifested in clear vision, no deformation, no distortion.

At the same time, because of the aspherical design, the thickness of the lens will be thinner than that of the spherical one, and the weight will be lighter, and the manufacturing appearance will be more beautiful. Compared with spherical surfaces, aspheric surfaces can correct the optical path, see objects more realistically, more naturally, and have a wider field of view, reducing eye fatigue after viewing. In the case of high diopters, aspherical lenses can reduce the distortion of the eye, and for consumers with high visual power, aspherical lenses may be more suitable.

However, not everyone can adapt to aspherical lenses, and some people are more comfortable with the curves of spherical lenses. It's hard to judge which one is good for eyesight.

Double aspherical lenses

Although it has been launched for many years, the current mature and stable double aspherical lenses are still mainly concentrated in first-line brands (such as: Zeiss, Heuer, Essilor, etc.) and Kemi, especially the double aspherical lenses, they choose MR-8 material Abbe number of 40, which is much higher than the MR-7's 32, the thickness and weight are very close, and the clarity is higher, and the field of view is wider. It's just that at present, ** is still relatively high (if the popularity is high, it should be able to reduce some).

Glass lenses

Glass lenses are now gradually being replaced. Glass lenses are more scratch-resistant than lenses made of other materials, but they are also heavier in weight.

Polymer resin lenses

Polymer resin lenses are lighter than glass lenses and are impact resistant and unbreakable, but because of their lower hardness, they are more prone to scratches than glass.

PC lenses

PC is a material that is more impact-resistant than polymer resins, and it is about the only one that is glass'One-tenth of the weight, compared with the traditional plastic lenses is only half of the weight, the general PC lens needs to add a scratch-resistant protective film, in the use of PC will be enough to obtain better aging, children's spectacle lenses are mostly used PC lenses.

Before choosing lenses, the accuracy of refraction is the foundation, and without an accurate prescription, no matter how good the quality of the lenses is, it is useless. After choosing the right frame for you, choose ultra-thin or ordinary or ultra-thin lenses according to the diopter, then choose spherical or aspherical lenses according to your own needs, and finally choose glass, resin or PC lenses according to your personal habits. Of course, it's best to consult a professional

Glasses people must know a lot about glasses frames, after all, everyone knows a little bit about good-looking and easy-to-use glasses frames.

But lenses are different, a lot of knowledge is professional terms, and people who don't know about it can only rely on the Internet to find information.

So, how to choose lenses more reliable?

Pre-vision examination

Before buying spectacle lenses, of course, you must have an understanding of your eye power, which is what we usually call optometry.

According to the degree of myopia to determine whether it is mild myopia or severe myopia, and then according to the degree of myopia, the refractive index of the spectacle lens is thinner, and it is more suitable for people with high eye power.

Optometry also has a role to see if your eyes have other diseases, such as astigmatism, glaucoma, etc.

Choose the right lenses

The quality of lenses is the most important factor in determining the quality of a pair of glasses.

At present, there are four major types of lenses on the market: optical glass lenses, ordinary resin lenses, or PC lenses.

Ordinary glass lenses are less expensive and scratch-resistant; Resin and PC lenses are lightweight and unbrittle, especially PC lenses, which can get rid of the pain of rhinitis and headaches caused by pressure on the nose bridge, and are safer for people who love sports.

Also, the same'power, the higher the refractive index, the thinner the lens. In general, if the prescription is high, try to choose lenses with a high refractive index, so that the glasses will be lighter.

Glasses should be replaced in a timely manner

In life, people are not diligent when it comes to changing their glasses.

However, ordinary myopic patients should generally change their glasses once every year to 2 years, one is to adjust the prescription, and the other is to "renew".

Once there are scratches on the mirror surface of glasses, it will obviously affect its optical correction performance, so it is necessary to maintain and inspect the glasses regularly, and update them in time to keep them in good working condition.