Glasses - a device that performs a number of functions related to vision. For example, it does not allow the sun's rays to blind eyes and helps to stay outdoors longer. Such accessories cope with their tasks with the help of filters. One of them is polarization.
Polarization concept
Our organs of vision perceive horizontal and vertical waves of radiation. Vertical ones help to recognize the image and color spectrum, while horizontal ones often act as optical noise. 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 be just a beautiful, but non-functional trinket. Polarization may be absent. Some qualities of sunglasses will disappear from this, but their main function will remain.
The filter itself is nothing more than a thin film . In expensive products, it is placed between two outer layers of glass. In cheap, it can be on top of the lenses. The latter option is not recommended due to rapid wear.
What are polarizing glasses good for?
Consequences of horizontal ray filtering:
- the clarity of the picture increases;
- glare is eliminated;
- it becomes easy to look at shiny and iridescent objects, as well as radiation sources;
- the blurred image decreases in fog, cloudy weather, in the dark.
Important! The listed qualities of certain lenses can be expressed in different ways. Some glasses better cope with glare on the water, while others are indispensable at dusk.
Who are recommended?
Athletes who practice and perform in the open air also resort to this category of accessories: skiers, snowboarders, cyclists. Athletes of the first two types with the help of polarizing glasses protect their eyes not only from weather conditions, but also from glare that occurs when sunlight is exposed to white snow.
The presence of a polarizing filter greatly facilitates the lives of people who, because of work or for their hobby, spend a lot of time on the water . These are fishermen (including winter fishing enthusiasts) and yachtsmen, as well as those who are fond of rowing or rafting.
Glasses with a similar effect can also be useful for those who have a hilarious hay fever - a type of seasonal allergy, one of the symptoms of which is photophobia. And with other diseases characterized by high sensitivity to light rays, polarizing lenses are a vital thing.
Which color is better?
The hue says about the specialization of the accessory, that is, about how and where it should be applied:
- Pink. Glasses increase sharpness, help to see small details.
- Yellow. Ideal for cloudy weather and in the dark.
- The black. The solution for a long stay in direct sunlight.
Pros and cons of such points
Such an accessory cannot be called perfect. In addition to its advantages, it also has disadvantages that must be taken into account.
Benefits:
- are a mandatory element of protective equipment in a number of professions;
- there is protection from direct sunlight;
- eye strain occurs later.
Disadvantages:
- high price;
- glasses are ineffective when the sun is at its zenith;
- not suitable for people who should wear glasses for vision correction;
- weaken the glow of ordinary road signs and markings;
- able to distort the distance;
- able to influence the perception of the information presented on the display.
How to check if polarizing glasses?
Test the product in the store immediately before making a purchase . In this case, avoid not only the disappointment associated with the purchase of a non-functional accessory, but also be able to protect yourself from cheating. You can distinguish such glasses from a fake using several methods.
Method 1
Ask the seller to show you polarization testing strips. If everything is in order with the filter, then through the glasses you can see on the strip what you would not see without them.
Method 2
Align the lens center of two different accessories with polarization. If the center at the same time changes color, darkens, then both of these glasses can be considered high-quality.
Important! If you do not know how to determine the center, then put one pair on the table, and place the second just above it. Glasses should lie parallel to each other. Then take the top accessory and turn it around so that it forms a 90 degree angle at the point of intersection with the bottom.
Method 3
