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Production technologies. Why do drivers need anti-glare glasses? Sunglasses with yellow lenses


From the picture you can already guess: 1) for drivers, 2) and of course, for computer scientists! 3) and more
And now some text from the author Ursego , from which we learn a lot of interesting things “If you watched “Projector Pereshilton” with Ivan Okhlobystin, you probably noticed that he came wearing glasses with yellow lenses:


Probably, most viewers took this for some kind of extravagant trick like a pink tie or a polka dot jacket, but in reality everything is much more prosaic. Okhlobystin is not a fool in life and knows what he is doing.

About what yellow filters do not allow harmful rays of the blue part of the spectrum to pass through, I didn’t read it on the Internet right away, but it all started when a few years ago I started working as a taxi driver, and at night. What is night driving? This is, in general, a dark picture outside the window (as a result of which the pupils dilate compared to daytime), but when the headlights of an oncoming car come into view, they simply burn out the retina (in the daytime, it doesn’t matter - the pupils are Already! ). And while driving, this joy is generally constant, and not once an hour... But a colleague (a seasoned wolf of the taxi business) saved me - he advised me to drive with yellow glasses (and due to the fact that I am already a bespectacled person, I bought a waybill for 6 bucks light filter on a clothespin). The mechanism is simple - the contrast decreases. Bright things become dimmer, but black things do not become blacker, i.e. the difference between the extreme points decreases. The result was amazing - my eyes stopped getting tired! By the way, a very interesting effect (or illusion?) was discovered - you put on yellow filters at night and suddenly it seems that the picture has become clearly lighter. I don’t know why - either the pupils are dilating, or it’s psychological... In short, if you are a professional driver (or just sometimes drive at night), then buy without hesitation - well, just without hesitation at all! By the way, if you’re a killer, then too - these glasses are given out at the shooting range so that the picture is clearer and more contrasty (I saw it when I took a kid to shoot with a real pistol somewhere on the northern outskirts).

But there is another use - for those who spend many hours at the computer. I specially ordered a pair (I have diopters) and keep them at work (by the way, this color is called amber in English, otherwise you will, like me, rub the poor saleswoman about yellow...) - sitting down in the morning to workplace, I put them on instead of the usual ones (with the same diopters, but made of transparent glass). But sometimes I forget to change my glasses, but then after a few hours an automatic reminder comes and my eyes hurt. I change it and the pain goes away. In short, if you also spend whole days with your face buried in a computer screen, then buy without hesitation - well, just without hesitation at all!

Operating principle polarized glasses.

Polarized glasses are designed to be worn in daytime days and are used mainly when driving a car in sunny weather.

A wave in which there is a preferred direction of oscillation is called polarization. Polarization itself is possible only in transverse waves, and oscillations occur only in directions perpendicular to the direction of radiation propagation. The operating principle of polarized glasses is based on cutting off predominantly polarized reflected radiation. When driving a car, radiation reflected from the surface of other cars, as well as from the wet surface of the roadway, is cut off. When fishing, radiation reflected from the surface of the water is cut off.

The operating principle of polarized glasses with yellow lenses

In order to understand the principle of operation of glasses with yellow lenses, it is necessary to remember the spectral characteristics of radiation sources. The color change occurs continuously and contains many halftones, so the distribution of the color spectrum is conditional.

In particular, spectral colors correspond to the following wavelengths (nm):

Radiation emitted by heated solids and liquids, has a continuous spectrum, i.e. contains all wavelengths in the visible range. The maximum is located at around 555 nm.

As can be easily seen from the graph, when using sunglasses with a transmittance of 50% (for example, polarized ones), the maximum relative visibility will simply drop to around 0.5, and when using glasses with a yellow component transmission it will remain almost at the same level. Therefore, the use of such glasses in cloudy weather and at night does not lead to significant loss of visibility.

The glow spectrum of atomic gases and vapors is a set of individual lines with characteristic wavelengths determined by the structure of the shells of the atoms of a given element. In particular, with halogen sources (car headlights), the main brightness is shifted to the blue region.

Let's move on to incandescent headlights. Radiation emitted by heated solids has a continuous spectrum, i.e. contains all wavelengths without exception, including the UV range. The characteristic color of incandescent lamps is “yellowish-white”.

Halogen headlight bulbs emit a "blue-white" color. The glow spectrum of atomic gases and vapors is a set of individual lines with characteristic wavelengths determined by the structure electron shells atoms of a given element. For example, the main spectral lines of helium atoms in the visible range are 447, 492, 587, 667, and 706 nm. Halogen lamps also have spectral lines in the UV range.

Now let's look at the yellow lenses in the glasses.

The overwhelming majority of people believe that to get yellow lenses you just need to paint transparent glass or plastic yellow. But that's not true.




Option #1. Make light filters with a narrow bandwidth (570-590 nm). In this case, they will transmit only the yellow component of light. All surrounding objects will turn yellow - some darker, others lighter. A sort of “gray-yellow movie”. It is unlikely that you can work at a computer or drive a car wearing such glasses. The color loss is simply terrible.

Option #2. Using the laws of color composition. It is known that if from white remove the blue component, it will turn yellow. Thus. If glass or plastic is coated with a coating that reflects the blue component of light, the transmitted white radiation will turn yellow. The same thing will happen if a dye is introduced into a mass of glass or plastic, which will absorb and (or) reflect the blue component.

Protective properties of glasses with yellow lenses

1. Any filter that reduces background light improves contrast visible image and therefore improves its clarity. The main thing for the human eye is to preserve or restore (cloudy, twilight, fog) the yellow component of light, because in the daytime, the maximum spectral visibility (perception by the eye) corresponds to a wavelength of 555 nm. The main wavelength band of spectral visibility is 500-600 nm, i.e. completely includes the yellow component 570-590 nm.

2. Cloudy weather, fog, twilight. The maximum spectral visibility shifts to the blue-green region (as intended by nature!). It is necessary to deceive the human brain and eyes - change color perception to yellow - the daytime region. At the same time, judging by the spectral transmittance of coatings for glass and plastics, part of the blue-green region of the spectrum is not suppressed. Of course, there are color losses, but they are not drastic. In this case, the blue-white background light is significantly suppressed. The improvements in comfort and image sharpness are enormous - put on your glasses and all doubts will go away!

3. Night driving - polarized lenses yellow. Color perception - see point 2.

A. Incandescent lamps. Yellow lenses not only transmit, but also largely reflect the yellow component (they absorb the blue). This is the effect of protection from oncoming headlights.

B. Halogen lamps have a significant blue component of the emitted light. Yellow glass they simply filter out a significant portion of the blue component.


VISION FEATURES

A person can distinguish surrounding objects only if they are illuminated and the reflected light hits the retina of his eyes. Light represents electromagnetic waves, they cause a visual sensation. Human eyes perceive the colors of the light spectrum differently. Under the same illumination, the perception of red and blue tens of times less than yellow and green. The sensitivity of the eyes to light of different wavelengths is shown by the so-called “visibility curve”. To improve the perception of less distinguishable colors and increase the contrast of vision, light filters are used.
Certain fragments of the solar spectrum have a negative effect on human eyes. It has a visible spectrum (light) and an invisible spectrum - ultraviolet (UV) and infrared (IR).
In most people, under the influence primarily of UV and related radiation - violet, blue and cyan - gradually accumulate destructive changes in the eyes, and vision deteriorates with age.
The most common means of protecting eyes and correcting vision is various glasses, but they must be properly selected.
In Fig:
X axis - wavelength in millimicrons
Y axis - eye sensitivity

LENSES AND FILTERS

Glasses are designed to improve vision and protect the eyes, they can be:

  • corrective– correcting visual defects, mainly myopia and farsightedness;
  • protective- protecting eyes from ultraviolet radiation and bright light;
  • corrective and protective simultaneously.

Main part of glasses, which determines the purpose and quality, is with veto filters or lenses made of transparent materials, fixed in a frame. To protect the eyes from radiation, replaceable filters are sometimes installed on top of the lenses of corrective glasses.
Light filters are plates, films, etc., partially or selectively absorbing various types radiation. Light filters can be flat or convex, but the thickness of the material is the same over the entire surface.
Lenses This optical elements with curved surfaces and different material thicknesses. Changing the shape of the internal and external surfaces of the lenses and the distances between them allows you to obtain the required optical power, measured in diopters. Corrective glasses are equipped with converging (“plus”) and diverging (“minus”) lenses. If necessary, corrective lenses can be given the properties of light filters.
Glass filters and lenses less than plastic ones, they distort objects, provide some protection from ultraviolet light, have high abrasive resistance - they are more difficult to scratch. Unfortunately, they are heavy and unsafe, since if they break, sharp fragments can damage your eyes. Because of more weight glass lenses less comfortable and convenient. In addition, they fog up faster and more if you enter a warm room from the cold.
Plastic filters and lenses They are much lighter and safer than glass analogues, therefore they are widely used in glasses used by drivers. Their main disadvantage is low abrasive resistance. Many clear plastics allow ultraviolet light to pass through.
To improve the properties of light filters and lenses, darkening, anti-reflective, antistatic, water-repellent and surface-hardening coatings are applied to one or both surfaces.
Anti-reflective coatings (AR coatings) are used to eliminate glare and ghost images that create light interference. These are very thin, less than one micron, layers of metal oxides (titanium, zirconium, etc.) that are applied to the surface of the lens. In the presence of such a film, the light reflection coefficient is significantly reduced. The thickness and refractive indices of the coating layers are selected in such a way that the reflected light waves and direct ones who came to inner side the lenses were mutually cancelled. A properly selected antireflective coating reduces reflection from both surfaces of the lens and increases its light transmission. Sunglasses used to reduce light load on vision. To do this, they have filters or lenses with varying degrees darkening, for example smoky gray, distorts color perception less than others.
Quality sunglasses must meet the following basic requirements:

  • loosen visible light until you feel comfortable;
  • absorb some of the violet and blue light;
  • almost completely reduce the intensity of ultraviolet radiation;
  • maintain the driver's ability to distinguish information on the dashboard of his car, as well as other vehicles and traffic lights, as well as road signs, markings, etc.

Sunglasses with “mask” are darkened only in the upper part, which allows you to protect your eyes from direct sun rays and at the same time it is good to see the instrument panel. The disadvantage is that they require the driver to constantly move their head, which tires the eyesight.
Protective polarized Glasses are recommended for use as sun protection when, after rain or in winter, light is reflected from flat shiny surfaces. The lenses of such glasses have a coating (polarizer), which allows them to cut off the horizontal component of the light wave and, to a certain extent, reduce its intensity.


Anti-headlight safety glasses with yellow and orange filters can be used in cloudy weather and dark time days, as they increase image contrast, color discrimination and clarity of perception. A tinting mirror strip is applied to the upper third of the lens surface. The effectiveness of protection from the headlights of oncoming vehicles with various light sources is associated with their following physical characteristics:
- incandescent lamps emit yellow-white light and contain all wavelengths without exception, but relatively less violet and blue light;
- halogen lamps emit bluish-white light with a significant blue component;
- xenon headlights, the most powerful, emit blue-white light with an even greater violet-blue component.
Anti-headlight filter lenses should absorb most of the violet-blue light from any headlights. The main disadvantage is the same as that of glasses with a “mask”.

Glasses for driving in poor visibility conditions(“all-weather driving” glasses) with yellow filters:

  • completely block ultraviolet radiation harmful to the eyes and increase the contrast of vision due to partial absorption of the violet-blue part of the spectrum;
  • improve color discrimination, transmitting light well in the yellow-green part of the spectrum;
  • relieve drowsiness and fatigue, improve perception external environment due to the transmission of light in the yellow region of the spectrum (the effect of the “sun” against the background of cloudy weather);
  • Like anti-headlight lenses, they reduce glare from oncoming headlights.


Since there are products of dubious quality on sale, it is advisable to purchase glasses in specialized “Optics” stores. Well-known global manufacturers mainly sell their products through them. Any glasses must have a Russian certificate indicating their manufacturer. Branded products must have appropriate packaging with a booklet and company logo stickers on the lens. It would not be superfluous to consult a specialist.
Driver glasses must be light, durable and injury-proof, and their light filters must have sufficient large sizes, to provide protection from light not only from the front, but also from the sides, without distorting objects.
It should be remembered that any glasses with light filters or light filter lenses absorb part of the light flux and should not be used in low light conditions if:

  • the light spot from the headlights of your own car is reduced so much that it no longer guarantees a timely stop in front of an obstacle;
  • the side lights and brake lights of vehicles ahead become faintly visible;
  • the reflected light from the retroreflectors of standing vehicles is significantly weakened and the idea of ​​the distance to them is distorted;
  • The reflected light from road signs and markings is significantly weakened and their colors change.

Chameleon glasses(the name in everyday life) with photochromic light filters (or filter lenses) are ineffective in the car interior, since its glass almost does not transmit ultraviolet radiation, and it is this that causes the “automatic” darkening of these light filters. In addition, their lenses are made of mineral glass.
Select filters(lenses-filters) for all lighting conditions is impossible, so it is advisable to have several glasses with different properties in the car:

  • sunglasses with gray, gray-green or, best of all, gray-brownish filters that do not distort natural colors (when using corrective glasses, you can use appropriate filters in the form of clip-on attachments);
  • "driver's all-weather" to improve vision when bad conditions lighting - fog, twilight, rain, snow (the correct selection is determined by the fact that, according to subjective feelings, they improve visibility and driving comfort).
  • polarized - as sunscreens, but it should be remembered that they almost halve the luminous flux and cannot be used in low light.

Caring for your glasses boils down to this:

  • store glasses, especially with plastic lenses, must be in a durable case with an internal covering made of fabric or leather;
  • glasses should be wiped with a thin and soft special cotton cloth;
  • wash glasses in case heavy pollution a special solution or water and soap (in no case should you use organic solvents);
  • place glasses on any surface with the lenses facing up;
  • It is good to protect glasses from falling with a chain attached to the ears;
  • adjust the fit of the glasses by bending the nose pads and ear hooks (if they are plastic, first lower them into hot water for 15-20 s).

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Anti-glare glasses are an accessory necessary for drivers, not only to preserve vision.

They also help to avoid accidents on the road.

Such glasses give a person the opportunity to simply not notice bright glare from reflective surfaces.

Operating principle

To prevent your eyes from being blinded by bright sun glare on reflective surfaces, Anti-glare glasses use polarized lenses. Their action is to filter out the irritant - reflected light. Respectively, by the human eye it is also not captured.

Another direction of action of this technology is the absorption of rays of the blue spectrum, which is harmful to the eyes. Anti-glare glasses absorb them, and a person perceives only rays of the yellow, safe spectrum.

The advantage of such glasses for vision is that they protect the eyes from ultraviolet radiation. They also help relax the eye muscles, which allows a person to see with more contrast and clarity. These properties are important for eye health.

The result of the glasses with polarized lenses– a clearer picture of what is happening on the road. Light glare on wet asphalt, snow, car windows, blinding light from headlights and lanterns are swept away. The likelihood of emergency situations is reduced, which is extremely important.

Who needs it and in what cases?

Anti-glare glasses are created primarily for drivers. They will also be useful for athletes, climbers, fishermen and sailors. When working in any conditions where sharp vision is required, and there are interfering reflective surfaces, anti-glare glasses will be appropriate.

Every driver has to experience discomfort, catching blinding glare.

At any time of the day, irritating factors are present. During the day - reflected sunlight, at night - headlights of oncoming cars and street lights.

An irritating factor around the clock can also be reflected in windshield dashboard. Properly selected anti-glare glasses successfully cope with all these problems.

How to choose the right anti-glare glasses

To choose the right anti-glare glasses, you need to analyze the conditions in which you most often drive. Depending on this factor, you will have to decide on the type of glasses.

Glasses with polarized lenses. Fully polarized lenses will be appropriate when driving at night in order to eliminate glare from artificial lighting.

Anti-glare glasses. These glasses have a special strip ( upper part lenses) that neutralize glare. For example, seeing an oncoming car or in bright sunlight, the driver should tilt his head slightly to protect his vision. Suitable for daytime driving.

Glasses with dark lenses provide the greatest protection.. They neutralize light glare and allow you to relax as much as possible. eye muscles, protect from ultraviolet rays. When there is fog, they make the picture contrast and help you distinguish objects better.

Glasses with yellow lenses are universal. They protect against UV radiation, reduce the intensity of glare from snow and headlights of oncoming cars, and give rest to the eyesight. Can be used in any weather and at any time of the day.

Glasses with brown lenses also provide eye protection from ultraviolet rays, dissipate glare from wet surfaces, car headlights, and relieve eye strain.

Suitable for driving in fog, twilight, and bright sunlight.

The frame of anti-glare glasses for drivers should be comfortable so that there is no need to correct them. To do this, you need to pay attention to the quality of nose pads and temples. It is advisable to choose thin ones so that they do not interfere with your view.

Polymer lenses weigh the least and do not break.

Well-chosen, comfortable anti-glare glasses will preserve the driver’s vision and protect him from accidents. You just need to correctly analyze the conditions for which they are required and carefully monitor the quality of the lenses and frames when purchasing.

It's no secret that spectacle lenses there may be almost any color. Have you ever seen a person wearing colored glasses on the street and wondered why he wears them - is it just fashionable or do they still have some practical function?

Yes, sometimes it can be a tribute to fashion, but most often colored lenses have unique properties . Unfortunately, very few people have knowledge on this topic. But we will help you figure it out. Let's start with this article, in which we will look at glasses with yellow lenses - what they are for and who is recommended to wear them.

How do yellow glasses work and what are they for?

Glasses with yellow lenses have the ability cut off the rays of the blue part of the spectrum, which are responsible for the appearance of “flares” on the retina from sudden sources of bright light or, in other words, short-term partial blindness.

Also, when using them, the contrast of the image decreases. As a result, bright light becomes dimmer, and in low light The “picture” becomes more legible.

It is important that the workmanship is of the highest quality top level: simply colored lenses – bad option, since although they will improve contrast, there will remain a high light transmittance of the yellow spectrum, which can have a depressing effect on the psyche.

Panacea for drivers

The first to know why yellow glasses needed, are, in particular, those who often drive in the dark.

For night driving you need lighter ones yellow shades. For twilight and fog conditions, yellow-orange shades of lenses will be convenient.

In addition to making driving more comfortable by improving image clarity and relieving eye strain, yellow spectacle lenses help avoid being dazzled by the headlights of oncoming cars.


In the daytime, excessive contrast can only make life more difficult for the driver. Therefore, yellow glasses are harmful to wear during the day, especially in bright sunshine.

Alternative for geeks

To protect the eyesight of people who spend a lot of time in front of computer monitors, there are special glasses whose lenses are usually clear or have a slight greenish/pink tint.

But if you take quality glasses with yellow lenses for drivers, or even better - designed specifically for pilots with additional protection from harmful radiation, they will also be convenient for computer geeks. Increased contrast relieving eye strain and protection from the radiation produced by the monitor - exactly what you need when you spend many hours at the computer.

This, of course, is not an ideal option, but it is quite appropriate if you do not have yellow ones on hand, which are used for driving.

In general, this is all the information about why yellow glasses are worn. Although you still need to tell us one more nuance: to avoid misunderstandings when purchasing in a store/ordering online, remember that the description of glasses usually indicates not the literal translation of the word “yellow” into English – “yellow”, but “amber” , which is also the designation yellow or amber color.

Enjoy your driving and comfortable work at the computer!