Glasses are a device that performs a number of functions related to vision. For example, it prevents the sun's rays from blinding your eyes and helps you stay outdoors longer. Such accessories cope with their tasks with the help of filters. One of them is polarization.
Concept of polarization
Our visual organs perceive horizontal and vertical waves of radiation. Vertical ones help to recognize the picture and color spectrum, while horizontal ones often act as optical interference. Polarization is a filter that does not transmit horizontal rays.
Important! UV protection and polarization are two different things. In sunglasses, the first type of protection must be present, otherwise harmful radiation will penetrate through the glass and, ultimately, such an accessory will turn out to be just a beautiful, but non-functional trinket. Polarization may be absent. This will remove some of the qualities of the sunglasses, but their main function will remain.
Himself a filter is nothing more than a thin film. In expensive products it is placed between two outer layers of glass. In a cheap one, it can be on top of the lenses. The latter option is not recommended due to rapid wear.
What are the benefits of polarized glasses?
Consequences of filtering horizontal rays:
- picture clarity increases;
- glare is eliminated;
- it becomes easy to look at shiny and iridescent objects, as well as sources of radiation;
- The blurriness of the picture is reduced in fog, cloudy weather, and at night.
Important! The listed qualities can be expressed differently in certain lenses. Some glasses cope better with glare on the water, while others are indispensable in the twilight.
Who are they recommended for?
No light interference due to horizontal rays, valued by specialists in a number of fields. For example, photographers, pilots and drivers - people who, by virtue of their profession, must see equally well in bright sun and in cloudy weather.
This category of accessories is also used by athletes who train and perform outdoors: skiers, snowboarders, cyclists. Athletes of the first two types use polarized glasses to protect their eyes not only from weather conditions, but also from glare that occurs when sunlight hits white snow.
Having a polarizing filter makes life much easier for people who spend a lot of time on the water because of work or hobbies.. These are fishermen (including fans of winter fishing) and yachtsmen, as well as those who are interested in rowing or rafting.
Glasses with a similar effect can be useful for treating hay fever – a type of seasonal allergy, one of the symptoms of which is photophobia.And for other diseases characterized by high sensitivity to light rays, polarized lenses are a vital thing.
Which color is better?
The shade indicates the specialization of the accessory, that is, how and where it should be used:
Blue. Lenses of this color are suitable for work and recreation on the water.- Pink. Glass increases clarity and helps you see small details.
- Yellow. Ideal for cloudy weather and at night.
- Black. A solution for long periods of exposure to direct sunlight.
Pros and cons of such glasses
Such an accessory cannot be called perfect. In addition to its advantages, it also has disadvantages that must be taken into account.
Advantages:
no glare effect;- are a mandatory element of protective equipment in a number of professions;
- there is protection from direct sunlight;
- eye strain occurs later.
Flaws:
- high price;
- glasses are ineffective when the sun is at its zenith;
- not suitable for people who need to wear glasses for vision correction;
- weaken the glow of ordinary road signs and markings;
- capable of distorting distance;
- capable of influencing the perception of information presented on the display.
How to check if your glasses are polarized?
Test the product in the store immediately before making a purchase. In this case, you will not only avoid the disappointment associated with purchasing a non-functional accessory, but you will also be able to protect yourself from deception. You can distinguish such glasses from fakes using several methods.
Method 1
Ask the salesperson to show you polarization test strips. If everything is in order with the filter, then through the glasses you will be able to see on the strip what you cannot see without them.
Method 2
Align the center of the lenses of two different polarized accessories.If the center changes color and darkens, then both glasses can be considered high quality.
Important! If you don’t know how to determine the center, then place one pair on the table and place the second one just above it. The glasses should lie parallel to each other. Then take the top accessory and rotate it so that it forms a 90-degree angle at the point of intersection with the bottom one.
Method 3
At home, checking lenses can be done in the following way. Turn on the device or gadget with an LCD screen and point the glasses at it. Then turn the accessory 90 degrees. If it is of high quality, then in the specified position it will not show what is happening on the display.
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