How to understand if the ultraviolet light passes through when choosing sunglasses?

How to understand if the ultraviolet light passes through when choosing sunglasses?

Testing UV Protection Of Sunglasses And Regular Glasses

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answers (3)

Answer 1
September, 2021

If for driving a car it is better to take glasses with polarization, and the filters with the highest protection are marked with DIN EN ISO 12312-1, but this is now a rarity and they can only be found in professional glasses for sports and driving.

Answer 2
September, 2021

Better be puzzled by the question of what the lenses are made of, and filters and their presence is a self-evident fact, as a rule, this is a mandatory UV 400 mark, if this is not there, then glasses are completely free and you should not take them.

Answer 3
September, 2021

First, it is necessary to clarify what kind of ultraviolet we are talking about and what percentage of its glass should stop so that we can say "does not transmit".

Visible light occupies the wavelength range from 380 to 780 nanometers. Next comes ultraviolet.

The biological effects of ultraviolet radiation in the three spectral regions are significantly different, therefore biologists sometimes identify the following ranges as the most important in their work:

Near ultraviolet, UV-A rays (UVA, 315-400 nm)

UV-B rays (UVB, 280-315 nm)

Far ultraviolet, UV-C rays (UVC, 100-280 nm)

UV transmittance:

Quartz glass - Very good

96% Si-O2 glass - Good

Borosilicate - Average

Lead - Poor

Sodium-lime - Poor

In any case, you will not face an excess of ultraviolet radiation and damage to the cornea by UV rays. But this does not mean that you can look at the sun, since in addition to UV rays, there is also an infrared and visible range with rays of different stripes and colors.

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