How to distinguish anti-reflective glasses from ordinary ones. Anti-reflective glasses. UV blocking coating for spectacle lenses

An anti-reflective coating is a special coating applied that diffuses direct sunlight or a beam of bright artificial light, which serves to improve the quality of image perception. human eye and cutting off the high spectrum of light.

For mobile devices

In the bright sun, it is simply impossible to see what is written on the monitor of a tablet or smartphone. The reason is the intense reflection of the sun's beam, the appearance of glare. To combat this problem, there is a special anti-reflective film that is simply glued onto the display. mobile device. The film is quite inexpensive, and also protects the device from scratches and bumps.

Computer monitors and large LCD televisions use a built-in factory anti-reflective coating. It is a special multi-layer deposition on the monitor. The anti-reflective coating literally scatters sunlight or artificial light that hits the surface of the device and prevents glare.

For optics

The glasses also use an anti-reflective system. This system implemented on the basis of an anti-reflex coating that reflects glare and improves the quality of the lens. Anti-reflective coating works best in high-index lenses, as they reflect significantly more light than plastic lenses.

The use of anti-reflective coating in glasses allows, in addition to eliminating the effect of glare, also to increase visual acuity.

Technology has spread to Sunglasses. However, please note that it is impossible to stick or spray such protection on glasses, the application is carried out only industrial way in the vacuum placement of the lenses in a special setup. The thickness of the anti-reflective coating layer is only 0.15 to 0.3 microns, and therefore the proposals to "upgrade" your "special coating" are nothing more than a hoax.

For the automotive industry

Anti-glare technology has also gained ground in the automotive industry. The same technology as in optics is used in the manufacture of windshields.

Such glasses have good color reproduction, scatter ultraviolet radiation, allow you to maintain high image clarity, scatter and block the reflections of the headlights of other vehicles.

Glass is produced by the method of magnetor-sputtering technology in industrial conditions. Anti-reflective glass allows you to experience driving comfort in any situation. weather conditions and at any time of the day. True, such glass costs a little more than usual, but is it really worth saving on convenience and traffic safety?

Anti-glare glasses- This is an accessory that is equipped with special polarized glasses. As a rule, they are not used for everyday wear, but can be very useful in certain cases.

In particular, glasses with anti-reflective coating are able to provide reliable protection of the organs of vision from glare emanating from the monitor screen, the surface of the water or the windshield of a car. In addition, this device protects the eyes and from the negative impact. ultraviolet radiation, as well as blinding headlights of oncoming cars.

How does anti-reflective coating work on glasses?

The mechanism of action of anti-reflective lenses for glasses is to screen out reflected light and leave only safe shades of the yellow spectrum. Such glasses completely absorb blue rays, which are more annoying than others. human organs vision, as a result of which they are simply not fixed by the eye.

This feature of this accessory is very valuable for drivers of vehicles who are constantly in conditions heightened danger. In some cases, it is the glare of light that causes blinding of people behind the wheel and subsequent accidents, so the use of such devices in such a situation becomes very important.

In addition, men and women who spend most of their time in front of a computer screen may also experience negative impact light glare. To avoid exposing your eyes increased load, they are also advised to wear specially coated accessories while working.

When a person additionally has certain, he can purchase anti-reflective glasses for vision, which not only protect the eyes from negative factors, but also correct the existing violations. Yet, in most cases, men and women prefer anti-reflective glasses for the computer or sunglasses with the appropriate coating for driving a car.

How to choose anti-glare sunglasses for drivers?

In order to choose the most suitable accessory, it is necessary, first of all, to decide on the color of the lenses. Take advantage the following recommendations to help you make the right choice:

• for drivers with perfect vision who intend to use anti-glare glasses exclusively for driving a car, the best choice considered an accessory with gray lenses. The dimming ratio in this case should be 70-90%;
• for those who constantly experience eye discomfort from traffic lights and brake lights, goggles with green lenses are suitable;
• finally, anti-reflective glasses with lenses of yellow or brown shades are considered a universal device. They significantly reduce the luminous flux coming from oncoming vehicles, improve visibility in bad weather and do not tire the eyes. In addition, such an accessory can be used for working at a computer.

Meanwhile, lenses are not the only important element anti-reflective glasses. Certain requirements apply to the frame, namely:

• the frame should be as comfortable as possible for its owner;
• goggles should fit snugly around the ears and;
• the frame should not be too loose so as not to fly off at the most crucial moment, but also should not squeeze the face;
• if glasses with temples attached to the bottom or top of the frame fit your face, opt for this model - it gives the maximum viewing angle and does not limit peripheral vision.

Many people confuse "Polarized Lenses" with "Anti-Reflective Lenses".

Even many glasses sellers confuse these concepts, while continuing to consider themselves experts in these matters and write "smart" articles that the Internet is now flooded with.

Well, nothing - now we will deal with this ...

For those who are not interested in understanding the principles, but urgently need the meaning of the terms - at the very end, the results are summed up.

Everything else is for the curious

Consider light as an electromagnetic wave - both of its components move in the same direction, but their oscillations are perpendicular.

At the same time, the individual light waves that make up the light beam are rotated at different angles, and as a result, overlapping each other form something like this (end view)

That's what it is unpolarized light that is emitted by most sources (bulbs, sun, headlights, etc.). Reflecting from surfaces, light becomes polarized. polarized light also freely distributed in space, like the usual sunlight, but mainly in two directions - horizontal and vertical.

The vertical component of the reflected light transmits for a person useful information, allowing you to recognize colors, contrast, and so on. (actually, our vision is the ability to perceive the light reflected from objects). The horizontal component of the reflected light creates optical noise, glare, blind spots and interference. The more reflective a surface is, the more glare will affect vision. So here it isglare is reflected light spots, the so-called reflections observed on different surfaces (water surface, metal products, wet road, windows, etc.).including even eyeglass lenses ).

Now about polarized glasses

Polarized lenses perform their functions thanks to a special polarizing film, which is usually applied to the lens of glasses.

How does polarizing film work?

During production, the film is stretched 5-7 times along one axis, as a result of which the molecular structure changes and an "elongated polarization grating" is formed, which transmits only rays directed according to the angle of its stretching (polarization angle). AT ideal conditions two films rotated 90 degrees will completely block out the light.

Note for those who do not understand anything: a triangular cube can be put into a triangular hole only by turning it to the correct angle. The film performs the function of such a sieve. It passes only correctly rotated waves and does not pass incorrectly rotated ones.

The glasses use a film that allows only useful vertical rays to pass through and blocks horizontal glare!

What then are anti-reflective glasses?

And this is a little different. As you already understood, anti-glare glasses are popularly called everything in a row (including polarized lenses), but this is not entirely correct.

We have already dealt with polarization above. Now consider the concept of "anti-glare".

Anti-reflective surface- this is a surface that practically does not glare (does not give a reflection). In order to make the surface anti-reflective, special anti-reflective coatings are used, which reduce the reflectivity of the surface.

Considering this issue with an example spectacle lenses, then anti-reflective lenses are correctly called those lenses that have an anti-reflective coating that makes these lenses more transparent (they are also called enlightened or anti-reflex).

We prefer to use the concept of antireflex coating, about which .

So let's sum up

Anti-reflective (reflection, anti-reflective) coating- This is an additional coating applied to the lens. It makes the lens more transparent by increasing light transmission and reducing light reflection from the lens surface (glare). Thus, the contrast of perception and visual acuity increase. In addition, if you look at a person wearing glasses with such lenses, you can clearly see his eyes, and not the reflections in the lenses of the glasses of surrounding objects.

Polarized lenses- These are lenses that are able to eliminate glare that occurs when light is reflected from various surfaces, such as water, snow, wet asphalt, roofs of houses. Bright glare degrades image quality as it causes make it difficult to distinguish any details and even dazzle. The secret of polarized lenses lies in the polarizing film inside them, which blocks light rays reflected from a horizontal surface.

Difference

Anti-reflective lenses = anti-reflex = coated.

Anti-reflective lenses do NOT equal polarized lenses.

Polarized lenses filter out some reflections from different surfaces, passing LESS light through itself in this way.

Anti-reflective lenses do not produce reflections on their own, thus allowing MORE light to pass through them.

And a few more pictures illustrating the difference

between how the world looks through polarized lenses and without them

Our expert is a researcher of the laboratory of ophthalmoergonomics and optometry of the Helmholtz Moscow Research Institute of Public Health, Candidate medical sciences Nina Kushnarevich.

Drivers are required to conduct an inspection of their car annually, and an examination of their own vision must be done at least. After all, a long and monotonous load on the eyes, which includes driving a car, can not be the best way to affect the state of the visual apparatus, and sometimes this happens quite quickly.

Optics by the eyes, but not by eye

Is it necessary to say that a "sharp eye" for a driver is the first thing?! Seems obvious! No matter how! You talk to the ophthalmologists and your hair stands on end. Turns out, most of motorists who turn to them, who have by no means perfect vision, and do not think about the need to wear glasses. Blind-sighted drivers somehow adapted, adapted and feel very confident behind the wheel, ignoring the fact that they have vision problems. But this confidence is deceptive, and you can pay dearly for it. For example, diseases such as retinal dystrophy, lesion optic nerve and, of course, refractive errors (even small ones) can lead to a deterioration in the ability to distinguish objects located on the side. What a violation of peripheral vision while driving can lead to is clear to everyone without further ado.

For drivers, the contrast sensitivity of the eyes is also extremely important, which allows you to distinguish between low-contrast images (for example, pedestrians at night), correctly determine the mutual speed of all participants traffic etc. Many have difficulty driving at dusk, in fog. All these problems can be solved with the right glasses or contact lenses.

Glasses or lenses?

Contact lenses are more comfortable. They give less distortion than glasses (especially at high diopters). Therefore, they are preferred for nearsighted people. In addition, any glasses limit peripheral vision, since they provide the biggest correction, only when a person looks straight ahead, and not sideways. Another convenience contact lenses- that they are always in the correct position, and the glasses sometimes have to be corrected, which can distract the driver's attention at the most inopportune moment. And in case of injury, the risk of injuring the eyes of a person with lenses, by the way, is also lower than that of a “bespectacled man”.

However, contact lenses also have disadvantages. First of all, it is more high price and more complex care (exception - daily lenses which cannot be reused). In addition, with non-contact vision correction (using glasses), there is no interaction between the lens and the cornea, which is especially important for people with dry eye syndrome, for whom wearing lenses can cause discomfort. In addition, contact lenses should not be worn during illness (including with a common cold), as well as with conjunctivitis, keratitis, and even when taking oral contraceptives. And one more small but significant minus - on a clear fine day, contact lenses (even those equipped with a UV filter) still cannot replace sunglasses. The fact is that lenses can protect against harmful effects sunlight (including from reflected and peripheral) only inner part eyes. Wherein eyeball and the skin adjacent to the eye are left unprotected. That is why, when wearing contact lenses, motorists must also use sunglasses.

If points, what kind?

Selected by a doctor. Under no circumstances should you make this choice yourself. This is the business of an ophthalmologist, who should definitely be consulted before obtaining a license and in the coming months after starting to drive. And then - regularly, at least once a year.

with maximum correction.. AT ordinary life a visually impaired person can afford not to wear glasses at all or to wear lenses that are weaker than required, but in a car interior, such “eyepieces” are needed in which vision will be optimal.

well seated. The driver should not have the need to constantly or from time to time adjust glasses moving down on the nose - this distracts from the road and impairs vision. Therefore, you should choose frames with high-quality nose pads and suitable in size. The design of the frame is also important - the temples should be thin so as not to interfere with the view.

Made from durable material. Polymer lenses (plastic, fiberglass) are recommended for drivers, as they are lighter and do not break (the most durable materials are polycarbonate and various combined materials: Trivex, etc.). While polymer lenses can change over time, they are optically as good as glass lenses, which are banned by drivers. However, there are exceptions: the use of special technologies makes it possible to manufacture glass lenses that, breaking on impact, do not crumble into small fragments.

Transparent. Any colored lens will block more light. Therefore, ideally glasses should be transparent. It should be borne in mind that according to international standard ISO 14889 driving lenses with less than 75% light transmission at night are not permitted, regardless of color.

Protectors and saviors

Today you can buy glasses for drivers with special coatings that have various protective properties.

Anti-reflective coatings. Such glasses let in more light and help the eyes recover much faster after being blinded by the headlights of other cars. Therefore, in conditions of poor visibility on the road, they can significantly improve the quality of vision. Typically, these coatings are applied to one or both surfaces of spectacle lenses. However, such glasses are needed only for people with vision problems. For those who see well, there is no need to wear spectacle lenses without diopters with anti-reflective coating, since any lens reduces light transmission.

Polarized lenses. Effectively protect both from the blinding sun, and from the reflected light. Polarizing filters they are used both on glasses with diopters, and on ordinary, sun glasses, which are good during the day, but are categorically unacceptable for driving at night or in poor lighting conditions.

Photochromic glasses ("chameleons"). They differ in that they change color depending on the lighting: they darken in the sun, and become transparent indoors. It is possible to use them while driving, but we must remember that a significant proportion of ultraviolet light is retained by the windshield, which reduces the sun protection effectiveness of such lenses.

Glasses-"anti-fare" (with yellow or yellow-orange lenses that delay Blue colour spectrum). Such glasses are suitable for driving at night and in cloudy weather, as they increase the contrast of the "picture". But the main thing that drivers who drive at dusk should know is that the most accurate correction is needed for night driving. Indeed, in the dark, the pupil expands, which leads to a significant increase in visual interference, and vision (especially contrast sensitivity) becomes worse.

A unique layer is applied to anti-reflective lenses, which has the ability to filter out reflected light fluxes, leaving only a safe sector yellow color. Such eyepieces completely absorb the harmful blue rays. This is very important factor since it is this sector that has the greatest negative impact on visual apparatus.

In a world filled with numerous gadgets, people great amount time is spent in front of a computer monitor, not thinking about how tired the eyes are from light reflections. When using protective optics, the negative impact is minimized.

Those who have problems with refraction should consider buying anti-reflective products with diopters. They act as a protective barrier and correct existing deviations.

Indications for the use of anti-reflective lenses

By appearance the product is no different from ordinary eyepieces with diopters. However, if you look closely, you can see green or blue overflows on the surface. This is due to the fact that the lenses of anti-reflective products are coated with a unique coating that reflects glare - the main reason for the loss of visual acuity when working with a computer. Also, an antistatic layer is applied to the product, so that the lenses do not attract dust particles.

If a person has an ophthalmic problem, he is prescribed anti-reflective lenses with diopters. Of course, the product does not provide 100% protection against negative impact technique, so remember to take regular breaks from work so that your eyes can rest. It is advisable to be distracted from the monitor every hour, the duration of the rest is fifteen minutes.

Also, doctors advise anti-reflective glasses in the following cases:

• Regular work with gadgets for a long time;
• Tendency to dryness of the mucous membrane;
• Cutting and burning in the eyes;
• Increased lacrimation;
• Sensation of sand under the eyelids;
• Photophobia;
• Redness of the sclera;
• Chronic fatigue of the visual apparatus.

The difference between polarized and anti-reflective glasses

Even in specialized salons, these two concepts are often confused. To learn how to distinguish between them, you first need to decide on the definition of glare. These are spots that appear on a smooth or raised, glossy surface that reflects light. Thus, it turns out that any surface can glare (with sufficient illumination and at the right angle of inclination).

Light polarization is a more complex term. It manifests itself when the rays hit the plane at a certain angle, reflected and propagated in the vertical and horizontal direction. The more reflective a surface is, the more damaging glare is to the eyes. Vertical polarization conveys information about the shades of the object and its contrast, while horizontal polarization generates various noises (blind spots, reflections, etc.).

Glare appears regardless of the time of year. Rays can be reflected from the water surface, snow. In conditions of poor visibility (for example, in heavy fog), glare adversely affects visual acuity, since parameters and colors are distorted. The eyes get tired quickly, the person begins to experience discomfort.

Anti-reflective products are a completely different term, since such a surface should not give shine or create glare. Such optics include lenses with a unique coating that makes visual system transparent. Such eyepieces are often also called enlightened.

Anti-reflective glasses reduce the amount of light reflection from the lenses, while increasing image contrast and visual acuity. If you look at a person in such products, you can easily see his eyes, and not see your own reflection in the glasses.

So let's sum it up. Anti-glare glasses let in more light without forming reflections. Polarized optics have less throughput, but also blocks a variety of interference well.

The principle of operation of anti-glare glasses for a computer

The PC monitor emits the entire "bouquet" of light fluxes, but most of all the blue and violet spectrum. These waves are responsible for excessive load visual apparatus, since they are part of UV radiation. Short rays scatter before reaching the retina of the eye. Thus, clearing the way for green and yellow long-wave streams. For this reason, the picture on the monitor often seems blurry. But red rays are considered useful, because they restore the metabolism in the tissues of the visual apparatus.

Anti-glare glasses block violet and blue light, preventing damage to the retina and lens. These eyepieces protect your eyes from electromagnetic radiation from the PC display, as well as from excessive brightness and glare.

Computer optics is designed to transmit orange and red streams, they have a beneficial effect on the visual apparatus. Also, the products block harmful short-wave impulses. As a result, image contrast and color reproduction are improved.

Anti-reflective lenses reduce drowsiness and increase efficiency by 30%, as eye strain is reduced.

Working principle for drivers

The sun's rays, especially in the summer heat or snowy winter, can lead to an emergency on the road. Since they almost completely blind the person behind the wheel. Some car enthusiasts use regular tinted sunglasses, but they only slightly darken objects in the field of view, without protecting from glare.

For the first time on the market, anti-reflective glasses were released by Polaroid Corporation. Therefore, products this manufacturer considered a classic. Initially, the role of the polarization layer was played by the thinnest plastic film, which was applied to the surface of the lens. The protective coating was located on top of the glass, which caused additional inconvenience, since it was often covered with scratches during transportation.

Modern technology allows you to hide the anti-reflective film inside the lens, which prevents its damage.

After watching the video, you will additional information about optics for drivers with a polarizing effect.

How to choose anti-reflective glasses

When choosing such products, first of all, you should decide for what purposes you plan to use it:

• Glasses with tinted lenses provide maximum protection from UV rays, scattering glare. They also significantly reduce the blinding of drivers by the headlights of oncoming cars. They make it possible to comfortably drive vehicles in the fog and reduce eye strain;
• Yellow lenses block UV, glare and reduce snow glare. They are recommended for use in low light conditions, in fog or on a blinding sunny day;
• Brown eyepieces also block harmful radiation, reduce headlight glare, relieve eye strain and allow you to drive in foggy conditions.

In any case, before buying, you should consult with an ophthalmologist who will help you choose the best option.

Rating of the best

Anti-reflective glasses are presented in a wide range. However, there are several manufacturers that have proven themselves in the market, offering consumers a quality product.

night view clips

The product is used for daily wear. Lenses improve image clarity, brilliance and color contrast. Has high UV protection. The advantages of the products include:

• The use of unique technology to protect the organ of vision;
• 100% UVA/UVB blocking;
• You can read in them, provided that the room is well lit;
• Suitable for people with visual acuity problems;
• Minimize eye fatigue
• While driving, it protects against the blinding headlights of oncoming cars;
• They allow you to see well even at night.

The cost of the product is approximately four hundred rubles.