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Sunglasses is really a very good thing, even if the person looks flat, the temperament is immediately improved after wearing sunglasses, how to look cool! However, there are too many styles and brands of sunglasses, there are dozens of dollars, there are hundreds of dollars, then there is a very interesting question - what is the difference between dozens of dollars and hundreds of dollars of sunglasses?

Ultraviolet light is not equal to glare

Whether it's a few dozen dollars of sunglasses or a few hundred dollars of sunglasses, it has the function of dimming the outside light. But remember, darkening the light doesn't mean blocking UV rays. Some sunglasses can also reduce the glare, but not the UV rays.

Ultraviolet light refers to the sun's rays with a wavelength between 200 nm and 380 nm. Therefore, any lens that can prevent the light of 380 nm or higher can effectively prevent ultraviolet rays. At present, one of the more common indicators is "UV400". If the regular brand has the "UV400" logo, then these sunglasses has no problem with UV protection.

What is the biggest hazard of inferior sunglasses?

Some people may ask, although the inferior sunglasses are cheap, they are better than not wearing them? wrong! If the quality of the sunglasses is unqualified, then it is better not to wear them. There are two reasons for this:

1, permanent eye injury

Bring sunglasses, the light is dimmed, so the pupils of the person will increase, but because your sunglasses cannot block the ultraviolet rays, it is equal to a large number of ultraviolet rays to ingest the large pupil, which is more than hurting the eyes! Moreover, the damage of ultraviolet rays to the eyes is cumulative and irreversible.

2, damage to vision

This is mainly a question of workmanship. General glasses, whether it is sunglasses or other glasses, have a reasonable optical index design, including sphericality, prismatic degree, etc. If the design is unreasonable, it is easy to visually deform the object, causing the eyes to double fatigue, and the vision will decrease in the long run.

Good sunglasses are completely UV-resistant in function; optically reduce visual distortion and protect eyesight; comfortable and strong in wearing, and high design and brand power, so there are a large number of people who are willing to pay a high price!

A few tips on wearing sunglasses

  1. is not the polarized glasses is the best, polarizers are only suitable for driving, generally exported to foreign countries are mostly PC tablets, high-end Ray-Ban tempered glass, in fact, are not polarized.
  2. Do not wear sunglasses inside or in dark places. Although cool is cool, the pupils will always enlarge, causing fatigue and affecting vision.
  3.  If myopia has sunglasses, it is best to match one with your own glasses. This can't be done, especially in long-term wear.
  4. In the color of sunglasses, in addition to personal preferences, there is some knowledge in it:

Gray lenses - reduce brightness, but do not change the true colors of the color.

Brown and amber lenses - reduce the blue portion of the sun, thereby reducing the haze effect caused by blue light, but it is more likely to cause the original color change of the object than the gray coating.

Yellow lenses - more to reduce the fog caused by blue light, so the scenery will become more clear and sharp, but it is also more likely to cause the original color of the object.

Green Lens - Ability to filter some blue light to reduce glare and increase the contrast between objects.

Rose Red Lens - If you like water or outdoor sports, it is best to wear this lens because it has a very good contrast on a blue or green background.

In the summer, I have arrived in the season with sunglasses. Many female friends will buy a variety of sunglasses. So, do you really understand the little knowledge of sunglasses?

Many people know that ultraviolet rays can sunburn the skin, but they don't know that their eyes will be "sunburned." The eye is the most delicate part of the human body. It is easily sunburned by ultraviolet rays. The sun has a cumulative effect. Over time, it will be harmful to the eyes. It is called "chronic light damage" in medicine.

The main function of sunglasses is to block the damage of ultraviolet rays to the eyes, not just to improve the visual effect. This requires that the transmittance of sunglasses to ultraviolet light in the sun is as low as possible, that is, the higher the reflectance and absorption rate, the better.

Light in the solar spectrum with wavelengths from 380 nm to 780 nm is called visible light, including red-orange, yellow, green, blue, and purple. The wavelength greater than 780 nm is invisible to the human eye and is called infrared; the wavelength is less than 380 nm. Some human eyes can't see it anymore. It is called ultraviolet (UV). According to different wavelengths, ultraviolet light can be divided into UVA, UVB, UVC and vacuum ultraviolet. Sun damage to skin and eyes is mainly caused by UVA. UVB and UVC caused by ultraviolet rays.

UV protection is an essential function of sunglasses. It has nothing to do with the color and transparency of the lens. It is usually achieved by coating. It is usually in the following three ways.

  1. Mark "UV400": It means that the lens can block ultraviolet rays and visible light with a wavelength of 400 nm or less; as long as the ultraviolet light transmitted through the lens is less than 2%, it is qualified.
  2. marked "UV", "anti-UV": means that the lens can block ultraviolet light below 380nm; as long as the ultraviolet light through the lens is less than 2%, it is qualified.
  3. marked "100% UV absorption": indicates that the lens has a 100% absorption of UV light; but in fact, the UV light through the lens is less than 0.5%, even qualified.

Buy sunglasses must not only be cheap and style, but you must also choose carefully!

Choose sunglasses notes

  1. Wear sunglasses not only to play cool but more importantly to protect the skin around the eyes and eyes from the sun's UV rays. The effects of ultraviolet light on the eye include cataracts, pterygium (a white neoplasm on the cornea), and inflammation of the eye (such as photokeratitis and photoconjunctivitis).
  2. Sunglasses that provide 99% to 100% protection for UVA and UVB will greatly reduce eye damage caused by exposure to the sun.
  3. Sunglasses that provide 99% to 100% protection for UVA and UVB must be selected. Sunglasses labeled "UV 400" or "100% UV absorption" on the label indicate that the lens blocks all UV light (including UVA and UVB).
  4. The color of the lens has nothing to do with the ability to filter ultraviolet rays. Wearing dark glasses without UV protection will enlarge the pupils of the eyes and increase the risk of UV damage to the eyes, so don't think that you can choose glasses with dark lenses.
  5. The transparency of the lens with low color is low. When the sun is violent or worn for a long time, choose sunglasses with low transparency. Choose from grey, Brown or Greenish-grey lenses when driving in the sun or during the day; yellow lenses are available for driving on cloudy and dusk; and brown lenses for golf.
  6. It is not recommended to choose brightly colored lenses such as orange or pink, because the image will be color cast (that is, the visually visible color is different from the actual color).
  7. Polarized lenses selectively filter UV light reflected from snow, water and beach surfaces for skiing and water activities.
  8. Baby can also wear sunglasses, and there is no age limit for wearing sunglasses.

Color: choose gray or brown

Gray or brown sunglasses can be worn in general outdoor environments. These two colors have good filterability and color perception, and can better distinguish various colors. Yellow, red, blue, green, etc. are not recommended, which will affect the resolution of the surrounding colors. Dark sunglasses, suitable for use in places where the sun is shining, such as the beach.

Size: can block the field of vision

At least the visual imaging area in front of the eye should be covered by the lens. If the sunglasses lens you choose is too small, you may see that there is no problem in front of you, but raise your eyes slightly to see the area above the front, and the glare will irritate your eyes. It is not necessary to choose oversized sunglasses. The glasses are too heavy to burden the nose, and the small face is easy to slip.

Radian: Don't be too big

Once the curvature of the lens exceeds 15 degrees, the refractive index of the lens receiving light will change, and the larger the mirror curvature, the greater the refractive index change. When wearing this kind of sunglasses, the things that are seen will be uneven, and it will be easy to wear for a long time. Eye fatigue, dryness, damage to vision.

UV index: between 96% and 98%

For the specific UV-filtering effect, pay attention to the UV index on the glasses tag. At present, the UV index of most sunglasses is between 96% and 98%, and the effect of dark lenses is better than that of light lenses.

1, the elderly: the best choice of gray lenses

It is best to choose gray lenses for the elderly with good eye health. Generally, it is better to use light to medium depth. Because gray is neutral, it can reduce the ratio of red-orange, yellow, green, blue, purple and yellow, and it has a cloudy feeling after wearing.

2, office workers: the lens color is not too deep

The color of the lens should not be too deep, generally at a medium depth. The dark lens affects the identification of traffic signals and command marks and is prone to danger on the way to and from work. Moreover, the dark lens makes the pupil naturally enlarge and the eye muscles are tight, which is not suitable for the office workers who have long-term eye fatigue.

3, children: it is best not to wear glasses

For children under 6 years old, it is best not to wear sunglasses. At this age, retinal dysplasia, long-term wearing sunglasses can lead to amblyopia. Parents cannot be lost because of smallness. If you are afraid of your child's eyes, you can take a cool hat shade. Or try to avoid places where you can go to glare.

4, driver: the best choice of polarized sunglasses

Driving outside for a long time, in addition to strong light and ultraviolet light, but also by the glare of the road surface, water surface, surrounding things, etc., you can choose a pair of polarized sunglasses, not only can block the glare, protect from ultraviolet rays, but also filter the glare emitted. To reduce visual fatigue and eye discomfort.

5, myopia: select the degree of color-changing glasses

It can be equipped with a pair of color-changing glasses with a degree. Under normal light, it is transparent myopia glasses. Under strong light, the color becomes darker, which can correct vision and block glare. It also has sunglasses with a degree for hyperopia. Or, wear contact lenses first, plus sunglasses.

In the hot summer days, the sun is like a fire, and it can't stop the children's curiosity and enthusiasm for outdoor activities. Ma certainly hopes that the baby can play, but at the same time there will be some concerns. Such strong light, adults feel glare, the baby's eyes will not be hurt, there are no protective measures to prevent the baby's eyes from being directly exposed to the sun. To effectively prevent UV rays from harming your baby's eyes? The treasure moms easily thought of sunglasses. So, how should children's sunglasses be chosen and used?

01 Do children need to wear sunglasses? why?

In general, the physiological development of children's eyes is not perfect, and the pupil's response to light stimulation is not as good as that of adults. A certain degree of bright light and clear image can help children to judge the light intensity and optic nerve regulation ability, which can promote the development of children's visual ability. However, if the degree of ambient light changes too much, especially in the summer, the ultraviolet rays are more intense outdoor activities, which can cause excessive adjustment of the pupil, fatigue of the eye muscles, dry eyes, itching, pain, and even light ophthalmia, such as conjunctivitis. Keratitis, etc., often become a risk factor for the baby to have problems such as amblyopia and cataract in the future, and once it is present, it is more difficult to correct, and even irreversible eye diseases may occur.

Wearing a baby's sunglasses can prevent glare from directly irritating the eyeball, relieve the pressure on the pupil, and reduce the discomfort of the child's eyes suddenly touching the glare. At the same time, a qualified child's sunglasses can also effectively filter harmful components in the light, especially blocking the ultraviolet rays on the retina. The damage of the lens can provide a relatively stable environment for protecting children's eye development.

02 Wearing sunglasses will affect your child's eyesight?

The standard for detecting children's sunglasses includes the top power, the prism, the visible light transmittance, etc., and the top power is the requirement for the degree of sunglasses. Sunglasses belong to the flat mirror, the deviation value will not affect the child's vision, but if the product is not qualified with the degree, the child is more harmful when worn for a long time.

Can I wear sunglasses for more than 03 years old?

Children's vision is in a developmental process and a process of adapting to the external environment. From the perspective of children's visual development cycle, 6-year-old children are basically close to adults. At this time, it is more reassuring to wear sunglasses. However, if children are 3-5 years old, although the eye development has not reached the adult level, the development is basically stable. The external environment's stimulating response has certain adaptability. Wearing sunglasses can improve the exposure of the eyes to the sun when playing in a strong light environment.

For infants younger than 3 years old, due to the unstable physiological development of the eyes and the influence of external stimuli, it is generally not recommended to wear sunglasses, and it is not recommended for children under the age of 3 to perform outdoor activities during periods of strong sunlight. Going out to play, it is best to choose before 10 am, and after 4 pm, to help the baby adapt to the external environment and meet the requirements of photosynthesis during the growth and development of the body, as well as avoid excessive light and excessive temperature. Adverse effects on your baby.

04 Is there a limit to the environment and the duration of wearing sunglasses?

Children wear sunglasses mainly to reduce the irritation and radiation of strong light to the eyes, so it is more suitable to wear in the environment with high light intensity and strong light wave radiation, such as the afternoon when the sun is shining and the summer when the light is strong. In addition, if you travel in snow, beach, Gobi, ocean and other relatively empty, rare vegetation, or in a geographical environment with high altitude and close to the sun, and stay longer, children can not only wear sunglasses Avoid too much light and block harmful light, and reduce the eyes from frost, sand, waves and so on.

Children should not wear sunglasses for too long, it is best to control within 2 hours. After all, sunglasses are artificially added to the eye as a protective umbrella. They cannot be relied on for a long time, affecting the mutual integration and balance between the body and the natural environment. Appropriate protection can improve the body's irritating response to the outside world. If it is too dependent on it, it will also cause discomfort in the eyes, such as acidity, swelling, pain, etc. Moreover, it will easily cause skin damage when exposed to strong light for a long time. Injury, excessive ultraviolet rays can easily burn the skin, destroy skin protection factors, and can cause a skin rash, itching, and even blistering and suppuration.

05 Choose sunglasses for children, what are the precautions?

Buying sunglasses can't just consider beauty, the safety and function of sunglasses are the most important.

Must be purchased in a regular store, can provide detailed manufacturer information and product structure, material characteristics, and usage precautions. A pair of qualified children's sunglasses need to block 95%-100% of UVA and UVB, filter 75%-90% of visible light, and a pair of unqualified sunglasses is not only useless and harmful, because when wearing sunglasses, baby The pupil will expand. If the sunglasses do not have the function of blocking ultraviolet rays, more harmful light will enter the baby's eyes, and the inferior lens thickness is different, and the color is uneven, which may cause visual damage.

In terms of lens material, polycarbonate is an ideal material, mainly lightweight, good impact resistance, high light transmittance and 100% UV protection. Of course, the best lens material at present is NXT, which is a high-grade urethane polymer. The disadvantage is that it is too expensive.

The colors are mainly gray and brown. These two colors are currently more suitable for children to wear, because the deviation of the color of the object is relatively small, and the weakened light does not change the original spectrum distribution. Light stimulates the development of the macula of the eye.

When you try on it, you can choose to look at the distance from farsightedness and nearsightedness to see if it is clear and whether there is any deformation. Whether the color of the red, yellow or green light of the traffic light is clear, you can walk a small distance, whether there is a sense of vertigo, and whether the ground plane has a concave and convex feeling. Is it convenient to walk?