The best manufacturers of eyeglasses. Instructions: how to choose the right lenses for glasses

Content

Age-related decline in the quality of vision is an inevitable process, but this does not mean that such changes should be put up with. It is really impossible to completely prevent physiological changes, but symptoms can be alleviated. To correct vision, doctors prescribe glasses with special lenses for farsightedness or nearsightedness. Find out what materials they are made of, how to choose the right one and whether it is worth buying options with different coatings.

How to choose the right eyeglass lenses

Before you go to the optics, you need to visit an ophthalmologist and go through full examination, especially if you are picking up this accessory for the first time. An ophthalmologist examines refraction, measures the curvature of the cornea, pupillary reactions, intraocular pressure, and examines eye day and then make an accurate diagnosis. You should not save time on going to the doctor, because even the slightest deviation in the prescription will doom you to the wrong purchase and lead to unnecessary financial expenses.

After the doctor has written a prescription, you can go to the optician. The frame is either metal or plastic. The first ones are the most durable and less prone to deformation, but they make the glasses heavier and can cause allergies. Plastic options are not as massive, but inferior in strength. The ideal option is metal temples and plastic temples. It is good if there are silicone pads on the nose pads.

Refractive index

The choice of the basis of points is carried out immediately according to several indicators, one of the most important is the refractive index. It determines the ability of glasses to pass the sun's rays. The higher this figure, the thinner, lighter and more expensive the lenses will cost. High index elements reflect 50% more light than their low index counterparts. They provide maximum efficiency and are often made in an aspherical design.

Focusing on the refractive index, it is worth considering individual characteristics, doctor's advice and frame material. According to the refractive index and modification of the lens, there are:

The only disadvantage of highly indexed glasses is the low dyspepsia coefficient, such lenses cause strong color distortions. Light, passing through the polymer, decomposes into several components, due to which iridescent distortions can occur at the edges, which in medicine is called chromatic aberration. The lower the dyspepsia coefficient, the more colored spots you will see around objects.

Optical zone selection

The next type of classification is the optical zone. It characterizes how many tricks the glasses have. There are three main types:

• Afocal. They do not have an optical zone and are prescribed by doctors only if there is no need to correct vision. Afocal options are installed in sunglasses, computer, fashion or office glasses.
• Single vision. Can provide vision correction either near or far. The same number of diopters is located over the entire surface of such glasses. Single vision glasses are prescribed for elderly patients to correct the weakness of accommodation.
• Multifocal. The surface of such glasses is divided into zones with different diopters. Multifocal elements help to focus the eye at different distances.

Lens shape

Modern production technologies make it possible to develop lenses not only with a high refractive index and a different optical zone, but also with all kinds of geometric shapes. The shape affects the thickness, lightness of the frame, the aesthetic appearance of a person, the brightness of peripheral vision. According to the shape of the lens are divided into:

• stigmatic or spherical;
• astigmatic or aspherical;
• bifocal or biaspheric;
• progressive or trifocal.

Stigmatic form

This is one of the most popular designs - convex. The spherical shape is cheap and suitable for almost any occasion. The surface of such glasses is pointwise marked with the same diopters and has an equal radius of curvature. Spherical elements provide high-quality vision only in the central part, the curved side gives a distorted view to the sides. The stigmatic form is of two types:

• biconvex - for the correction of farsightedness;
• biconcave - to correct myopia.

astigmatic

These are lenses in which one or two surfaces are non-spherical. Due to this geometric feature, they have minimal optical distortion of objects. When wearing aspherical accessories, there may be a distortion in the size of the eyes. The disadvantages include multiple glare that occurs on the glass surface, so they are often produced with a special anti-reflective coating. The astigmatic type is prescribed for people with a high degree of myopia or hyperopia.

bifocal lenses

They have two spherical surfaces at once with an inner and a outside. The specific construction provides the widest possible overview and clarity of the image of objects. In addition, the bifocal shape is thinner compared to other types. Ophthalmologists recommend wearing it with high diopters or astigmatism, when the patient needs the lightest design possible.

progressive

If earlier people bought several types of glasses at once (one for sight, others for watching TV or reading), today scientists suggest using progressive lenses. On the upper part there is a zone for distance vision, and the lower part is for viewing objects nearby. They do not blur the contours of objects when moving from one type of vision to another. The only drawback is that it takes a long time to get used to them. They are not recommended for patients who have cataracts, strabismus, a large difference in diopters in the right and left eyes.

Spectacle lens types

If earlier only glass was used for vision correction, now there is a wide selection of other materials that are safe for humans, and the technology for making glasses is being improved every time. Glass or mineral elements are still popular due to their low cost, but they are being replaced by polymer elements, which have a lower weight but a higher price.

Glass (mineral)

The most popular lens type. They are made from special grades of mineral glass, which are characterized by high oxygen permeability. The main advantages of mineral glasses:

• Durability. Glasses can be used long time, while the surface remains unclouded.
• High optical performance and increased resistance to surface scratching.
• The best option for people with a high minus. Their refractive index is higher than that of plastic options.
• High throughput, thanks to which glass elements are used to create anti-reflective, polarized and sunglasses.

Many advantages do not hide the significant disadvantages of glass lenses:

• They have low shockproof properties, so they are not recommended for wearing by children and athletes. To preserve the integrity of the glasses, it is recommended to store and carry such glasses in a special durable case.
• They can cause discomfort during prolonged wear, leaving traces of the frame on the bridge of the nose, causing headaches, dizziness.
• Lenses with a photochromic coating have low light transmission characteristics.

Polymer

Modern safe plastic has become an excellent alternative to glass for vision correction and quickly gained popularity among consumers. The main advantages of polymer elements:

• Short adaptation time. Compared to glass, they are much lighter, so they do not cause fatigue, discomfort during prolonged wear.
• Safety, low level injury. The plastic is unbreakable, even with a strong blow, you don’t have to worry that a fragment will fall into the eye.
• Plastic is easy to process, allowing manufacturers to create different designs.
• Polymer elements retain optical properties even under extreme conditions, do not fog up, help to see clearly in the rain.

When choosing polymers, it is worth knowing that, depending on the color palette, the perception of the surrounding world and even mood may be slightly distorted. For these reasons, ophthalmologists recommend choosing clear or discreet shades that minimize color distortion. Other disadvantages of polymers include:

• They scratch, so you only need to carry them in a case.
• Not suitable for people with high minus.
• The high cost of eyeglass lenses compared to glass elements.

Depending on which of the organic materials was used for production, polymers are divided into three subspecies:

• Thermoplastics are compounds of liquid monomer molecules, which are obtained by polymerization of ultraviolet light. The most common material is CR-39. Its properties are close to crown-type minerals, but it is 40% lighter.
• Thermoplastics are polymers obtained by thermal interaction or by casting granules. The most famous thermoplastic is polycarbonate. It has a high injury resistance.
• Quasi-reactoplasts are a combination of several types of plastic. They are distinguished by high optical properties, are resistant to injury, and do not distort space.

Types of coverage

When choosing glasses, you should pay special attention to the presence of special protective coatings. It can be anti-grease, mirror-coated, anti-static or dirt-repellent. Popular types of spraying:

• reflective - prevents eye damage from bright flashes of headlights, preferably for motorists;
• hydrophobic - will protect the surface from the accumulation of water;
• enlightening - will reduce eye strain, preferably for those who sit at a computer monitor for a long time;
• mirror - provides maximum protection against UV rays, is used to create sunglasses.

Water repellent

It is important for each consumer that the optical surfaces of the glasses remain clean and transmit light as much as possible even in extreme weather conditions. To meet such needs, manufacturers apply a special hydrophobic coating. A thin silicone film completely covers all irregularities, so that water drops easily roll off the surface. Such glasses are easier to get rid of dirt and dust, they almost never fog up when moving from a warm room to a cold one.

Anti-glare

This coating helps protect your eyes and help you recover faster from being blinded by bright light in poor visibility conditions. Anti-reflective coatings are used to create glasses for motorists and are very popular. A special layer relieves eye strain, soothes, refracts light well at night. Anti-reflective coatings are used not only to create glasses with diopters, but also for accessories that are not intended for vision correction.

Hardening

This coating helps to maintain the integrity of the surface upon impact, prevents scratches that distort vision. Hardening coating is present only on lenses made of organic polymers, it is rarely used on glass. For different materials manufacturers select hardening varnishes with the appropriate refractive index.

enlightening

A coating that is used to increase the transparency of a lens and reduce the reflection of light from its surface. The disadvantage of the antireflection film is that it reduces the impact resistance. If the glass is heavily loaded, dropped or hit, the anti-reflective elements may crack or delaminate. For these reasons, it is recommended to wear glasses with such a coating only when working at a computer.

Antireflex

A coating that helps eliminate glare from glass surfaces. In addition, their presence interferes with eye contact between interlocutors. To eliminate the defect, manufacturers often apply an anti-reflective film to the surface of glass or plastic. It improves the quality of the picture, the permeability of light and oxygen, eliminates glare, and does not interfere with the view. In addition, the anti-reflex coating improves visual acuity.

A coating that has a high level of filtration of ultraviolet rays. Mirror coating is used for the production of sun protection accessories, both with and without diopters. This type of coating is applied to obtain a cosmetic effect and protect the eyes; it has no effect on the sharpness, quality and correction of vision. Mirror coating different colors gives accessories a stylish look and unusual design.

Manufacturer

When choosing the right optics, you need to pay attention to the reputation of the manufacturer. Reliable and high-quality products will help to preserve vision for a long time and will last for a long time. The following world brands can boast of the latest developments in the field of optics:

• Essilor (France);
• Hoya (Japan);
• Carl Zeiss (Germany);
• Rodenstock (Germany);
• Seiko (Japan);
• Nikon (Japan).

Which eyeglass lenses are best?

There is a wide variety of glass and high-quality organics that help protect eyesight, complement the image and even create a special attractive accent in appearance, have a neat appearance and are suitable for people with varying degrees of vision distortion. Before buying a particular model, you should consult with an ophthalmologist. The top 10 popular models include:

Features of choice for children

The main criterion is that glass is excluded due to the fact that it can break and scratch the skin and mucous membranes. Arriving at the optics, you should pay attention to a transparent polymer - acrylic or polycarbonate. The metal frame is also excluded. It is too rigid, can cause allergies, bend and ruin fine details. The frame should be soft, monolithic. It is desirable that the frame be on flex hinges, which will prevent distortion, even if the child removes it with one hand.

For active sports

Sports accessories for the eyes must give a clear picture of the surrounding space so that the athlete can accurately calculate the coordination of his movements. To do this, most specialized sports accessories come with an anti-reflective coating. In order for the frame to fit snugly to the face, it is provided with silicone gaskets on the nose-resistant folds, rubber temples and is made at a certain bending angle. A special occipital strap helps to fix the frame tightly on the face.

When choosing varieties of professional glasses, it is necessary to take into account the occupation of the athlete:

• For cycling and motorsport, polymer inserts with diopters are preferred. The degree of darkening of the glasses should not be higher than 1–3. It is better to choose a gradient mirror coating with yellow, golden, green or aqua spray.
• For swimming, the best lens material is polycarbonate with a hydrophobic coating. The color of the glasses is selected depending on the pool.
• To play tennis, volleyball, badminton glasses must be with a UV filter. The frame is a half-rim so as not to narrow the viewing angle.

For motorists

Glass lenses for motorists are contraindicated. The optimal material is plastic or fiberglass (polycarbonate, trivex). Lenses must be transparent so that the degree of light transmission is not reduced. For driving a car during the day, polarizing options are suitable, which effectively protect against blinding sun, glare on wet pavement or on buildings. For night driving, it is advisable to buy anti-headlights with yellow or orange lenses.

Where to buy eyeglass lenses

You can buy good glasses for frames at any pharmacy in your city. Consult with the seller which frame is better to choose, consider all the recommendations given above. In addition, you can order lenses for glasses through an online store or a catalog of an official manufacturer, specifying for the seller the availability of a certificate, the availability of the necessary diopters, design.

The eyes are not only a mirror of the soul, but also a kind of filter through which a huge amount of different information passes every day. The use of electronics has become an integral part of our lives today. And it is not surprising that our eyes are under tremendous stress. That is why people are increasingly suffering from visual impairment and seek help from specialists. After the ophthalmologist has written you a prescription, a natural question arises: how to choose glasses for glasses, which ones are better? This matter must be approached with particular care, since the health and comfort of your eyes will depend on this. Most people only pay attention to appearance frames rather than glasses lenses, but this is not a very correct approach. So how to choose glasses so as not to miscalculate, because spectacle lenses have many criteria that should be followed when choosing? Now we will deal with this.

Refractive index of lenses

This is one of the most important lens parameters. From this indicator the volume and thickness of the lens depend: the greater the refraction, the smaller the width and weight of the object. Their use is indispensable with a high degree of refraction and when installed in children's rimless frames.

Important! For glasses that have more than 3 diopters, it is advisable to choose glasses with a high refractive index.

At high refractive indices, the light transmission of the lens becomes worse. This problem is solved by applying coatings that help eliminate glare and brighten the lens.

The price of lenses with a higher refractive index is higher. At the same time, they have a pleasant appearance and greatly increase comfort.

Aspherical or spherical lens?

Glasses of standard glasses have a spherical surface. Such lenses are called - spherical. Aspheric glass options - on the contrary, have a flatter appearance. Compared to spherical lenses, they have many advantages:

• Their eyes are attractive.
• Do not distort the lateral viewing angle.
• The clarity of the image is increased.

However, in terms of reflective properties, aspherical models clearly lose to their spherical competitors. Which glasses for glasses is better to choose - spherical or aspherical, it is up to the buyer to decide.

Plastic or glass lenses?

Previously, glasses were made exclusively with glass lenses. These lenses have another name - mineral. But over time, they began to produce lenses that are made of plastic, or as it may also be called, a polymer.

Initially, the polymer had many disadvantages compared to its mineral counterpart. But over time, manufacturers tried to improve their optical characteristics and wear resistance. And today, plastic products are no worse than glass products in their merits, and even take some advantage.

Which lenses to choose for glasses - mineral or polymer, depends on many factors.

Advantages of glass lenses:

• Clear and unclouded glasses, even after many years of use.
• Durability. Over time, these lenses do not deform.
• Protects the retina from harmful ultraviolet radiation.

Important! This is ideal for people who have to spend a lot of time under the sun. Such lenses are recommended for skydivers, pilots, drivers.

• They have excellent throughput, regardless of the type of lighting.

Important! Upon request, the buyer can order an anti-reflective, polarizing or anti-reflection coating on the surface of the lenses.

Disadvantages of glass lenses:

• They have reduced anti-shock properties, so these glasses must be handled carefully and carefully.
• The production of double-curved glass lenses is a costly endeavor, which is why it is desirable for people with astigmatism to purchase polycarbonate lenses.
• May cause discomfort when worn in the form of heaviness in the bridge of the nose and the appearance of traces from the frame.
• Slow change in the light transmission properties of photochromic lenses with different types of dark shades.

Advantages of plastic lenses:

• Impact resistance. The polymer is considered the most resistant to falls and impacts.

Important! Polycarbonate models are 200 times stronger than glass models.

• A light weight.
• Thermal resistance. Withstand impact high temperatures, which is very important for those who work in those industries where high temperatures are present.
• Provides comfort when wearing these glasses. Due to the light weight of these lenses, you can choose from both semi-rimmed and rimmed frames.
• Safety. It is much more difficult to break it, but even if this happens, the fragments will be less traumatic.
• Ample opportunity for the manifestation of individuality. Polymer products are easier to process, which makes it possible to make such glasses in various color variations.

Important! It should be borne in mind that the influence of different colors distorts the perception of everything around and affects the mental state of a person. For people who want to stand out, experts advise opting for discreet tints that can block ultraviolet and infrared light without distorting surrounding colors.

• Products made of polycarbonate are perfect for those who lead an active lifestyle.

Disadvantages of plastic lenses

Perhaps the only significant disadvantage plastic lenses is that this material is very easy to scratch. Although some manufacturers already produce special coatings that are applied to the surface of such lenses. This composition makes it possible to protect the lenses from mechanical influences.

Now, having studied all the advantages and disadvantages, it will be easier for you to decide on the problem of choosing glasses - glass or plastic, which is better.

Types of coatings for lenses

The choice between plastic or glass does not always satisfy the needs of the client. Except different types lenses for glasses, there are also additional coatings that allow you to save your eyesight and make life more comfortable:

• Hardening. It is applied to almost all lenses both from the inside and from the outside. As the name implies, this coating contributes to the protection of glasses, and also extends their life.
• Enlightening. Can be applied in one or more layers. Provides the clearest, brightest image experience by reducing light reflections.

Important! The antireflection properties of glasses will depend on the number of such layers.

• Mirror. Typically, this coating is applied to glass for cosmetic purposes. It gives the glasses a more beautiful and stylish appearance. This coating can be combined with any lens color.
• Antireflex. Enhances image quality by allowing your eyes to receive 10% more light. This improves visual acuity and reduces tension.

Important! Anti-glare glasses will great solution for those who drive vehicles on duty or are in the center of camera flashes.

• Hydrophobic. This coating does not allow foreign substances to attach to the lenses, and also prevents fogging, for example, when moving quickly from cold to warm.
• Multifunctional. It combines several types of coatings at once, which greatly increases the advantages of glasses.

footage

The choice of glasses is a very responsible matter, since the health and comfort of your eyes will depend on it. Moreover, when choosing, it is very important to understand the issue, glasses for glasses - which ones are better. We hope that the information provided by us will help you choose the ideal glasses for yourself and use them comfortably.

Gone are the days when eyeglasses were associated with nerdy young people. Now even glasses for vision correction are a fashion accessory. By choosing the shape, lenses and frames, a person can transform himself outwardly, emphasize the serious or business style of the image.

But if the choice of frames will affect only the appearance, then the correct selection of spectacle lenses is the key to eye health.

Modern technologies make it possible to manufacture glasses of any shape and with purely individual lens properties.

Essilor is an international company that has been producing spectacle lenses for the second century. For many years of experience, this company has gained an impeccable reputation and many satisfied customers. It is remarkable in that it not only produces lenses, but also independently conducts all research, developing a technological process.

Essilor was the first to market lenses made of polymeric materials. The leader in the optical industry has produced the iconic Crizal coated lenses. It protects the lens surface from dirt, water, scratches, glare.

Hoya - These lenses originally from Japan appeared for the first time in 1941. The company is the progenitor of the technology for applying an anti-reflection coating to glass lenses. It is famous for strict quality control and a wide range of products.

Rodenstock is a German company that has been doing its business since the end of the 19th century. In addition to spectacle lenses and frames, it produces optical equipment. Rodenstock is a symbol of German quality and modern technology.

Carl Zeiss started as a small workshop producing and selling mechanical and optical instruments. Carl Zeiss, founder of the company, created the first apochromatic lenses.

It is quite difficult to choose which of the presented companies is better. After all, all eminent manufacturers have in their arsenal rich, more than 100 years, experience and modern technologies. It is these combinations that allow them to remain market leaders for many years.

Production material

Currently, there are two options for the material for the manufacture of spectacle lenses. The first and more traditional of these is inorganic glass. Such lenses are called mineral. The lens material is obtained by melting and cooling the glass-forming components.

Variation method chemical composition you can change the optical characteristics of the material: refraction, density, Abbe number.

Much later, polymer lenses, also called organic lenses, were invented. They are made from synthetic polymeric materials with various additives. They are divided into thermoplastics and thermoplastics.

Glass

Advantages:

• The hardness of the material, due to this factor, glass lenses exhibit high resistance to surface scratching.
• Wear resistance - glass products retain their original appearance longer.
• High temperature resistance and light resistance.
• The surface of mineral lenses has better adhesion to various coatings.

For people suffering from a large deviation from unity, mineral lenses remain the only option. Glass has a higher degree of refraction, so in order to avoid a thick lens, ophthalmologists advise their patients with a similar problem to give preference to inorganic glass products.

Flaws:

1. The main disadvantage of glass products has always been their fragility. And if you take into account how close the glasses are from such an important organ as the eyes, then you need to keep in mind that the likelihood of injury is much higher than when using lenses made of plastic.
2. The use of such optical correction devices by children is unacceptable.

Organic lenses are heavy, with the constant use of such glasses, the bridge of the nose gets tired. Due to their weight, glass lenses are rarely used with rimless and semi-rimless frames.

Plastic

For a long time, inorganic glass was a priority material for the manufacture of spectacles. This happened due to the many shortcomings of polymer products. But now organic lenses are more actively crowding out competitors. Per last years, the technology for the production of optical products made of plastic has advanced a lot and is not inferior to glass in anything.

Advantages:

• Light weight, which means less stress on the bridge of the nose.
• The high impact resistance of the product, when dropped, the polymer lenses will remain intact, and even if they break, then into several large pieces of plastic, and not a thousand fragments.
• Good absorption of dyes used in the production of multi-colored lenses.
• Counteracting UV-A and UV-B ultraviolet radiation ranges.

The only significant drawback during the operation of organic lenses was the low resistance to scratching.

To solve this problem, special reinforcing coatings are applied to the surface of plastic lenses, which prolong their service life.

Selection of the refractive index

Refraction is an important property that determines the thickness and volume of a lens, the percentage of reflection from its surface. Choosing the right ratio affects the comfort of use and the visual appeal of the glasses.

A higher refractive index means better optical properties: the lens is thinner, lighter, stronger and more expensive.

To choose glasses with the required refractive index in the optics salon, you need to pay attention to the prescription issued by the ophthalmologist. If a person has a large degree of visual impairment, then the use of lenses with a high refractive index is shown to him.

The higher the refractive index of the material, the thinner and flatter the finished spectacle lens will be, which means the glasses will be more comfortable for the user and aesthetically pleasing.

The coefficient may also vary depending on the choice of frame. Using a plastic frame, you can choose less low rate refraction, since in this case a thick lens will be less noticeable.

Lens coating options

To improve the properties and extend the service life of plastic lenses, special coatings are applied to their surface:

1. Hardening - protects the surface from scratches.
2. Water- and dirt-repellent - increases resistance to the formation of contaminants and makes it easier to clean the lenses.
3. Anti-static - prevents the accumulation of dust and the accumulation of static electricity.
4. A coating that provides protection against blue-violet light emitted by the screens of electronic devices.
5. Chromatic - protects the visual organ from excessive bright light.
6. Anti-reflective - improves the transparency of the lens, reduces the appearance of glare and thus reduces visual strain.

Many manufacturers now offer their consumers to use glasses with a multifunctional coating that solves several problems at once. They usually use hardening, water-repellent and anti-reflective coatings.

Lenses for working at a computer

The harm of the computer to the human visual organ lies in the constant tension of the muscular eyes, the glare of the screen and the wrong posture when the screen is at an unsafe distance.

The result of frequent work at the monitor are: dryness, burning sensation, sand, foreign body, redness of the eyes, fear of bright light, watery eyes.

For those who work all day at the computer, ophthalmologists recommend the use of special glasses. They can be purchased by both a person in need of correction and a person with normal vision. A special coating is applied to the surface of such lenses, which reduces the brightness of the image, while increasing its clarity. Therefore, the eyes are less strained and therefore less tired.

Choosing the right lenses reduces eye strain, reduces overall eye fatigue and improves quality of life. First of all, you need to contact an ophthalmologist to check your vision, he will write out a prescription, with which the patient is already sent to the optics salon. Here, experienced professionals will help him choose best option based on requirements and budget.

With a high degree of myopia or hypermetropia, the use of special aspherical lenses is recommended. They are thinner, lighter, which allows them to be placed even in elegant frames, while not changing the size of the eyes, which is usually the case with thick lenses.

Age-related presbyopia is inconvenient in that vision is reduced and it becomes difficult to see objects that are close by. But, for example, to drive a car, additional distance glasses are required. For this reason, people over 40 have to carry several glasses with them at a time.

This problem can be successfully solved by using progressive lenses, they are divided into zones for far and near vision. Optical properties allow the eye to smoothly transition from distance to near viewing.

For people involved in sports, it is better to pay attention to polymer lenses, they have increased strength and the likelihood of eye injury with them is minimal.

Modern production of optics allows you to choose glasses for every taste and budget. But in no case should you neglect the examination by a doctor. Consultants in the spectacle salon can only orientate on the properties and functions of the lenses, they do not select lenses in accordance with individual vision needs.

In the video below, ophthalmologists figure out when it is better to use lenses and when glasses:

Today, there are several alternatives to the use of glasses. They are, carrying out laser therapy operations. But, despite this, a variety of this optical product is still in trend, and is very popular.

The variety of spectacle lenses, their color, the quality of the material, sometimes makes it difficult to choose which type to choose.

Ultimately, they will serve as a corrective device to eliminate visual dysfunction, and be a fashion accessory that complements the style and lifestyle of a person.

To carry out right choice, you should initially consult an ophthalmologist. He will perform the necessary research to write out a prescription with optimal optical performance.

For this purpose, the ophthalmologist will perform the following procedures:

1. Check visual acuity.
2. Will measure the distance between the pupils.

People who have previously worn glasses should also visit an ophthalmologist to make sure that their vision remains at the same level.

After performing these manipulations, you can go to the optician's store to purchase glasses:

Impact resistant lenses

For people leading an active lifestyle, including children, it is recommended to purchase glasses with impact-resistant lenses made of polymers (polycarbonate).

They fit well:

Based on the foregoing, four stages of the selection of points can be distinguished:

1. Get advice from an optometrist.
2. Visit an optical store.
3. Choose the right frame.
4. Make a choice of lenses.

Color

A wide range of colors allows the owner of the glasses not only to carry out vision correction, but also to make them a fashionable element and part of their image.

Most often, lenses made of polycarbonate material are stained.

Considered as an element of color therapy, creating a positive well-being and uplifting mood.

When choosing colored lenses, there is one nuance that you should pay attention to. The degree of darkening of the lens, and the degree of protection from ultraviolet rays is not the same thing.

Clear lenses can create a 100% barrier against ultraviolet penetration, but direct sunlight will blind your eyes. And the opposite situation is when dark lenses provide comfortable vision, but there is no protection from ultraviolet rays.

Kinds:

Refractive index

Abbe number, or refractive index - this is the most important parameter, it must be considered when choosing spectacle lenses. Its high performance ensures the minimum thickness of this product.

But high marks lead to color distortion, as a result of which an iridescent border appears when viewing objects.

Its occurrence is individual for each patient, therefore, when choosing a lens, it is necessary to achieve the optimal ratio of improving visual acuity, with a refractive index.

There are 4 groups of refractive index:

1. Normal refractive indices are 1.498-1.53.
2. The second group is characterized by the parameters of the average value of 1.53-1.63.
3. Group 3 has a high value of 1.64-1.73.
4. High level of refractive index, starting from 1.74 and more.

Higher index values ​​provide the spectacle lens with increased strength and minimal thickness, while it will have a price much higher than its counterparts with a small coefficient:

• If the patient has a slight deviation in visual function, in the region of 2 diopters, the optimal decision would be to choose the value of the Abbe number from 1.5 to 1.6.
• in 6 diopters, it is necessary to stop at the choice of the value of the refractive index 1.6-1.7.
• Coefficient 1.7 is used when running forms visual organs. It will be optimally combined with aspherical design lenses.
• If the choice is in favor of thicker lenses, then the frame should have a more massive shape and consist of plastic or horn material.
• Slim, elegant frames on screws are well combined with lenses having a high refractive index.

Optical influence of lenses

For diseases of the visual organs, it is necessary to correctly select corrective products.

For this reason, it is used:

• With farsightedness or nearsightedness spherical type lenses are suitable for the patient.
• Astigmatic lenses, are used to eliminate visual dysfunction called.
  Two types of lenses can be used:
  • Cylindrical. They are used in the treatment of simple astigmatism.
  • Toric. Can be used in the treatment of complex or mixed astigmatism.
• Afocal lenses characterized by a complete lack of optical capabilities. They are used if a person has a difference in the parameters of the display of visual images (aniseikonia). This type of lens can also be used, if available.

Spectacle lenses - design

There are two design directions to consider when choosing this optical product. Since glasses, in addition to eliminating visual defects, are perceived by many people as a fashion accessory that complements their image.

The following types are distinguished:

In turn, aspherical lenses can be:

The use of aspherical lenses has a number of advantages:

• When using them, you can achieve minimal distortion of the displayed image.
• Compared to other types of lenses, they have an extended viewing angle.
• in the peripheral zone, maintains high rates.
• Visually, they have a natural shape.

Material for manufacturing

There are two types of material that are used in the manufacture of eyeglass lenses:

Lens Coatings

All lenses, regardless of cost, are coated with a protective layer that prevents scratches on their surface. Recently, many types of protective coatings have been used. They have a purpose depending on the type of human activity.

The following types of lens coatings can be distinguished:

This type of optical product has become in demand, especially in recent times. Most people cannot imagine their life without the Internet, which requires working at a computer. Also, office workers often resort to wearing this accessory.

To implement the right one for working at a computer monitor, three factors must be considered:

This type of product can be used by people who do not have visual dysfunction. To relieve eye strain, glasses that have a green or brown tint are very suitable. They relieve visual fatigue, increase the clarity and contrast of the image.

It is very important that this product is not used while outdoors or while driving.

Popular brands

First of all, spectacle lenses are a commodity, and therefore it is worth paying attention to the manufacturer of this optical product. Popular brands have a high cost, but are distinguished by a high degree of reliability and comfort when wearing the product.

The top three in the world are: