How to check glasses for UV protection?

It is believed that all sunglasses have UV protection. However, this is not true in the case of cheap plastic glasses. If you want to buy a high-quality stylish accessory, learn to distinguish ordinary plastic from a fake. So what is needed for this?

How to check whether glasses pass ultraviolet?

It is best to conduct a test at the place of purchase and before it is made. To keep things going smoothly, take a UV flashlight with you.

Easy way with the appliance

In stores specializing in the sale of sunglasses and ordinary glasses, there is always a spectrometer. The buyer has the right to use it and check the goods before purchasing, you just need to ask the seller to provide access "to the device . " The check itself takes a matter of seconds. It is enough to bring the glass to the reading element, literally immediately after that, the numbers will be displayed on the screen. This will be the desired indicator.

Important! Do not forget to compare the resulting number with what the manufacturer stated in the description. If the values ​​do not match, there is a high probability that you are holding in your hands not the original, but a copy.

In addition to a spectrometer, a photometer is also used to determine UV permeability. It does not show numbers, but the type of lens. Explanation of values:

  • DANGER - red light - a signal that the lens transmits over 12% of UV rays;
  • CAUTION - yellow light - the lens transmits within 4–7% of UV rays;
  • SAFE - green light indicates high glass protection.

Try to purchase products that, when checking the photometer, were classified as SAFE.

Verification without equipment

"By eye" the presence of protection is impossible to determine, since human vision does not perceive ultraviolet radiation, just does not see it . To confirm this, illuminate the lens with a UV flashlight. Do not notice anything unusual.

In order to be able to see the difference between glasses with and without ultraviolet protection, you need a beam source of the appropriate type and an object with luminescent properties. For example, a sticker, pen or marker. This thing is put on the table and the light of the flashlight is directed at it. Glasses are placed between the beam of the flashlight and the luminescent object.

If the manipulation led to the fact that the thing lit up, then this indicates the absence of protection from the UV radiation from the glass. If the glasses have not missed the rays, then you can safely get the pair in question.

Check flashlight and the inscription

The technique is largely similar to the previous one, but you do not have to look for an object with luminescent properties. It is enough to take a ticket, an excise tax or a passport and enlighten it with a flashlight with UV radiation (do not forget to put glasses between them). Invisible holographic signs under the influence of ultraviolet light begin to glow. If there is no glow and no inscriptions and signs appeared during the experiment, this indicates the presence of a specific pair of UV protection.

Important! Do not try to check Visa cards in this way. An invisible inscription on them will glow in any case, regardless of the qualities of the sun accessory.

Practice check

The method is suitable for those who have the opportunity to be in the sun for several days in a row and quickly tans . If after this time the face changes color, and the skin under the eyes remains approximately the same shade, then we can talk about the presence of protective qualities in the glasses. True, the severity of the property in this way cannot be determined.

Check with BLB lamp and white cloth

Turn on the light source, place absolutely white matter in front of it. Put glasses between them. If they are of high quality and do not transmit UV rays, then there will be no luminescent effect.

Parameters of glasses with 100% protection - which ones?

Just seeing the protection score is not enough. It is necessary to compare the numbers obtained when checking with a spectrometer with a reference point . In sunscreens, the best option for UV protection is: UV400. If the device showed exactly this figure, then everything is in order, if less - the radiation will fall on the eyes.

Important! The only valid option besides UV400 is UV380. Points with such an indicator are imperfect, but still able to cope with the task.

Also, do not be mistaken and think that the color of the glass affects something. Lenses of impenetrable black color can be absolutely useless in terms of protection against UV rays, and an accessory with a green tint, on the contrary, do not let in harmful radiation.

Recommendations for choosing good points

Pay attention to the temples. It is there that manufacturers most often indicate the presence and level of ultraviolet protection. It can look as follows: CE or UV400.

Do not buy points in markets and street shops . Firstly, there are no devices with which you can verify the properties of the goods. Secondly, counterfeit and low-quality products that have not passed the required tests are usually sold in this way.

Do not try to save . Reliable sunglasses can not cost less than 1 thousand rubles. Exception: sales.