Lenses for glasses: which to buy

The content of the article

• How to choose the right lens for glasses
• Refractive index
• Optical Zone Selection
• Lens shape
• Stigmatic form
• Astigmatic
• Bifocal lenses
• Progressive
• Types of lenses for glasses
• Glass (mineral)
• Polymer
• Types of coverage
• Water repellent
• Anti-glare
• Hardening
• Enlightening
• Antireflex
• Mirror spraying
• Manufacturer
• Which lenses for glasses is better to choose
• Features of the choice for children
• For active sports
• For motorists
• Where to buy lenses for glasses

Age-related decline in the quality of vision is an inevitable process, but this does not mean that such changes should be reconciled. Physiological changes cannot be completely prevented, but symptoms can be alleviated. To correct vision, doctors prescribe glasses with special lenses for hyperopia 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 spraying.

How to choose the right lens for glasses

Before you go to optics, you need to visit an optometrist and undergo a full examination, especially if you are choosing this accessory for the first time. An ophthalmologist examines refraction, measures corneal curvature, pupillary reactions, intraocular pressure, examines an eye day and then makes an accurate diagnosis. You should not save time on a trip 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 prescribed a prescription, you can go to the optician. The frame is metal or plastic. The first are the highest strength and less prone to deformation, but make glasses heavier and can cause allergies. Plastic options are not so massive, but inferior in strength. Ideal option – metal arms and plastic temples. It’s good if there are silicone pads on the nose pads.

Refractive index

The selection of the basis of points is carried out immediately for 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 indicator, the thinner, lighter and more expensive the lenses will cost. High index elements reflect 50% more light than their counterparts with a low coefficient. They offer maximum efficiency and are often aspherical..

Focusing on the index of refraction, it is worth considering individual characteristics, doctor’s advice and material for the frame. According to the refractive index and lens modification, they distinguish:

The only minus of highly indexed glasses is a low dyspepsia ratio, such lenses cause strong color distortion. The light passing through the polymer decomposes into several components, due to which rainbow distortions, which in medicine are called chromatic aberration, can occur around the edges. The lower the dyspepsia ratio, 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 have points. 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. Affocal options are installed in sunglasses, computer, image or office glasses.
• Single-focal. They can provide vision correction either near or far. Over the entire surface of such glasses, the same number of diopters is located. Single-focal points are assigned to elderly patients to correct weakness of accommodation.
• Multifocal. The surface of such glasses is divided into zones with different diopters. Multifocal elements help focus your eyes at different distances..

Lens shape

Modern production technologies allow us to develop lenses not only with a high refractive index and a different optical zone, but also of 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. The shape of the lens is divided into:

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

Stigmatic form

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

• biconvex – for the correction of hyperopia;
• biconcave – to correct myopia.

Astigmatic

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

Bifocal lenses

They possess two spherical surfaces at once from the inside and from the outside. The specific construction provides the widest possible overview and clarity of the image of objects. In addition, the bifocal form is thinner compared to other types. Her ophthalmologists recommend wearing with high diopters or astigmatism, when the patient needs the most lightweight design.

Progressive

If before people bought several types of glasses at once (some for sight, others for watching TV or reading), today scientists suggest using progressive lenses. On the upper part there is a zone for distant vision, and the lower one for viewing objects that are nearby. They do not blur the contours of objects when moving from one type of vision to another. The only drawbacks are 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 eye.

Types of lenses for glasses

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

Glass (mineral)

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

• Durability. Glasses can be used for a long time, while the surface remains unclouded.
• High optical performance and enhanced surface scratch resistance.
• 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-glare, polarizing and sunglasses.

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

• They have low shockproof properties, therefore, are not recommended for children and athletes. To preserve the integrity of the glasses, it is recommended to store and transfer such glasses in a special durable case.
• They can cause discomfort during prolonged wear, leaving traces of the rim on the bridge of the nose, causing headache, dizziness.
• Photochromic lenses have low light transmittance.

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 with prolonged wear.
• Safety, low injuries. Unbreakable plastic, even with a strong blow, you can not worry that the splinter will fall into the eye.
• Plastic is easy to process, so manufacturers can 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 colorless or low-key shades that minimize color distortion. The remaining disadvantages of polymers include:

• Scratched, so you need to transfer them only in the case.
• Not suitable for people with high minus.
• 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:

• Reactoplasts are compounds of molecules of a liquid monomer, which is obtained by polymerization of ultraviolet radiation. The most common material is CR-39. Its properties are similar to those of the crown type, but it is 40% lighter..
• Thermoplastics – polymers obtained by thermal interaction or by granule casting. The most famous thermoplastic is polycarbonate. It is highly resistant to trauma..
• Quasireactoplasts are a combination of several types of plastic. They are distinguished by high optical properties, injury resistant, do not distort the space.

Types of coverage

When choosing glasses, it is worth paying special attention to the presence of special protective coatings. It can be anti-greasy, with a mirror coating, antistatic or with a dirt-repellent effect. Popular types of spraying:

• reflective – prevents eye damage from bright flashes of headlights, preferably for motorists;
• hydrophobic – protects the surface from water accumulation;
• antireflection – reduce the strain on the eyes, preferably for those who sit for a long time at a computer monitor;
• Mirror – provides maximum protection against UV rays, used to create sunglasses.

Water repellent

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

Anti-glare

This spraying helps to protect the eyes and recover faster after being blinded by bright light in conditions of poor visibility. Anti-glare coatings are used to create glasses for motorists and are very popular. A special layer relieves stress from the eyes, soothes, refracts light well in the dark. Anti-glare coatings are used not only to create glasses with diopters, but also for accessories not intended for vision correction.

Hardening

Such spraying helps to maintain the integrity of the surface upon impact, prevents scratches that distort the vision. Reinforcing spraying is present only on lenses made from organic polymers, rarely used on glass. For different materials, manufacturers select reinforcing varnishes, with the corresponding index of light refraction.

Enlightening

A coating that is used to increase the transparency of the lens and reduce the reflection of light from its surface. The disadvantage of an antireflection film is that it reduces impact resistance. With strong glass loads, drops or impacts, the antireflection elements may crack or delaminate. For these reasons, wearing glasses with this coating is recommended only when working at a computer..

Antireflex

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

Mirror spraying

A coating that has a high level of ultraviolet filtering. Mirror spraying is used for the production of sunscreens, both with and without diopters. This type of coating is applied to obtain a cosmetic effect and protect the eyes; it does not have any effect on the acuity, quality and vision correction. Mirror spraying of 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 maintain vision for a long time and will last a long time. The following world brands can boast the latest developments in the field of optics:

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

Which lenses for glasses is better to choose

There is a wide variety of glass and high-quality organics that help preserve vision, 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 must consult an ophthalmologist. The top 10 popular models include:

Features of the 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. Coming to optics, it is worth paying attention to a transparent polymer – acrylic or polycarbonate. A metal frame is also excluded. It is too hard, can cause allergies, bend and spoil delicate details. The frame should be soft, monolithic. It is advisable that the frame be on flex joints that will prevent skew even if the child will remove it with one hand.

For active sports

Sports eye accessories should give a clear picture of the surrounding area so that the athlete can accurately calculate the coordination of his movements. For this, most specialized sports accessories are available with anti-reflective coating. In order for the frame to fit snugly to the face, it is equipped with silicone pads on the nose folds, rubber temples and is made at a certain bending angle. Tightly fix the frame on the face helps a special neck strap.

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 glass dimming should not be higher than 1-3. It is better to choose a gradient mirror coating with yellow, golden, green or aqua.
• For swimming, the best lens material is polycarbonate with a hydrophobic coating. The color of the glass is selected depending on the pool..
• For playing tennis, volleyball, badminton glasses must be with a UV filter. The rim is 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 in the afternoon, polarization options are suitable that effectively protect against the blinding sun, glare on wet asphalt or on buildings. For night driving, it is advisable to buy a headlamp with yellow or orange lenses.

Where to buy lenses for glasses

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 the online store or catalog of the official manufacturer, specifying for the seller the availability of a certificate, the presence of the necessary diopters, design.