What does sunglasses 100 UVA UVB mean?

100% UVA UVB refers to 100% resistance to the harmful rays of UVA and UVB, UVA is a terrible sun killer, which can penetrate the surface layer and penetrate deep into the tissues below the dermis, which can destroy the internal microstructure of collagen, elastic fiber tissue, etc., resulting in wrinkles and fine lines, and sagging and aging.

UVB damage and protection has been thoroughly studied, it can make ** sunburn in a short period of time, redness (for the average person is about 25 minutes), now the vast majority of sunscreen products on the market are UVB type, SPF is a sign of UVB protection ability. In the energy distribution of ultraviolet rays in sunlight, UVA is 15 times that of UVB, which is the main cause of tanning. High-quality sunglasses are completely resistant to UVA and UVB exposure.

The upstairs is more detailed, but there are a few misunderstandings:

1.The main cause of tanning is UVB: after the skin is exposed to the sun, UVB causes the Melanin melanocytes on the surface of the skin to continuously produce melanin, which is transported to the keratinocytes in the epidermis, resulting in a darkening of the skin's complexion.

This pigmentation usually disappears within 1 month.

2.Nowadays, many well-known brands sell sunscreen skin care products that have the effect of blocking UVA and UVB, such as L'Oréal Paris's multi-protection lotion.

The measurement index of UVA is PA: PA+, PA++, PA+++ Although sunglasses can resist ultraviolet rays, after all, they are only limited to the eyes, and it is recommended to use good sunscreen skin care products for sun protection.

UVA UVB is a classification of ultraviolet rays The label on sunglasses should be 100% UV isolated.

The weather in September is getting hotter and hotter, with the arrival of summer, many friends like to wear sunglasses when they go out, when we choose sunglasses, we can often see sunglasses with anti-UVA and UVB logo, I believe there are many friends who do not know what it means, then here I will take you to the stool to understand it.

UVA and UVB refer to different wavelengths of ultraviolet light. The anti-UVA and UVB labels of sunglasses mean that these sunglasses can prevent UVA and UVB wavelengths from ultraviolet rays and prevent UVA rays from damaging the eyes.

According to the different biological effects, the ultraviolet rays can be divided into four bands according to the wavelength, namely UVA, UVB, UVC, and ultraviolet rays with a wavelength of 320-400nm, which have strong penetrating power, can penetrate most glass and plastics, and will also reach the dermis layer of the skin, which is also the culprit of tanning in the human body. UVB refers to ultraviolet light with a wavelength of 275-320mn with moderate penetration. UVC refers to ultraviolet rays with a wavelength of 200-270mn, which has the weakest penetrating power and is called short-wave sterilized ultraviolet light, and the UVC in sunlight is almost absorbed by the ozone layer.

UVD refers to ultraviolet rays with a wavelength of 100-200mn and is known as vacuum ultraviolet light.

According to the different wavelengths of ultraviolet rays introduced above, we can know that wearing sunglasses and sunglasses with UVA-proof and UVB logos when going out can better protect your eyes. When purchasing, you can try to choose lenses with larger lenses and stronger wrapping, which will have better protection.

1. The damage to ** is different: UVA has strong penetrating ability, but UVB is not easy to ignore, because of its high energy, (UVB) damage to ** is also very large. Polarized light has a weak damage to **.

2. The penetration force of the belt is different: sunlight penetrates the earth's atmosphere, and a large part of UVB is blocked by the atmosphere, but UVA is stronger than UVB, so more than 90% of ultraviolet rays are UVA. And UVB is not even easy to penetrate glass.

Polarized light is less penetrating.

3. Different wavelengths: UVA and UVB are both ultraviolet rays in sunlight, and ultraviolet rays are invisible to the naked eye (if they are visible, they are called visible light). In a physical sense, ultraviolet and visible light are due to the different wavelengths of light, and the comparison of UVB and UVA shows that UVA has a longer wavelength and UVB has a shorter wavelength.

Polarized wavelengths do not.

UVA is long-wave dark spot effect ultraviolet rays, UVB is medium wave red spot effect ultraviolet rays, generally speaking, sunscreen is said to be UVA-proof, which means that the sun protection index is better. In addition to the basic UV protection function, polarized sunglasses also have anti-glare, road reflection light, water surface scale light, etc., suitable for driving, fishing, traveling, and daily wear.

Only the big red dates are used for improvisation. Pears are best to choose Sydney, mouth v

In addition to the need for sun protection in summer, the eyes also need sun protection, and sunglasses are the most suitable products to help the eyes protect from the sun. When buying sunglasses, I found that there are two main types of lenses, namely UVA and UVB lenses, which is better, UVA or UVB? Others are curious about what UV lenses do.

1. From the point of view of the damage to the stupid closed ruler: the penetration ability of sunglasses UVA is strong, it can penetrate the glass, although UVB is not easy to penetrate the glass, but the energy is high, and the UVB is more harmful to the world.

2. From the perspective of wavelength: UVA and UVB refer to the wavelength of ultraviolet rays, of which UVA is a long wave, and the wavelength of the band is medium wavelength, with a wavelength of 275-320nm. They protect against different wavelengths of ultraviolet light, which can provide different sun protection results.

In terms of sunglasses UVA and UVB comparison, sunglasses UVA will be better. Of course, both UVA and UVB sunglasses can play a role in sun protection and eye protection, so it is recommended that when buying sunglasses, you should choose a product that has both UVA and UVB protection.

For example, when shooting in a strong sunlight environment, UV lenses can weaken the high blue and white tones brought by ultraviolet rays, so that the lens can show the true appearance of the sky and other scenes. Especially in photography, the use of UV lenses can play a role in protecting the lens.