When it comes to how to pick sunglasses, many friends blurt out:

Choose the color of the dark, the sun protection effect is certainly good!

Recently popular xx, fashion good match, but also show thin;

......

But in fact, the color is particularly dark sunglasses are not suitable for all-day wear, but affect travel safety. Sunglasses are not only a cool decoration.

Wear a pair of good sunglasses to protect against UV rays, protect the skin around your eyes, prevent the sun from aging after the sun, and improve the comfort of wearing contact lenses.

Since sunglasses have so many benefits, how on earth should you choose?

When you buy sunglasses, you will always encounter some "inexplicable parameters", do not understand what it means, let alone make a choice ...

Although we generally have color glasses, are collectively referred to as sunglasses, but in fact, sunglasses have different transmission ratio, different uses, there will be different classification.

According to the classification of CAT (National Standard GB 10810.3-2006). Four transmission ratio categories, corresponding to the four categories of sunglasses:

Category 1 (CAT.1): 43% to 80%

Category 2 (CAT.2): 18% to 43%

Category 3 (CAT.3): 8% to 18%

Category 4 (CAT.4): 3% to 8%

Note: The transmission ratio refers to the proportion of light passing through the medium. For example, a certain type of sunglass lens has a transmission ratio of 30%, which means that only 30% of the visible light energy can pass through the lens into the eye.

How to choose?

Look at the sign.

According to industry standards, all sunglasses on sale must be displayed.

In addition, the sign should be marked with the implementation standard number, such as QB 2456, GB 10180, etc., indicated that is the first categories of products, such as sun visors, special use, etc. At the same time also need to mark the manufacturer, trademarks, materials and other convenient buyers according to the need stoush.

If you buy sunglasses without this information, it may be "fake and shoddy", wearing out of the door may not have the effect of protection.

Follow the wearing scene.

As mentioned above, the different categories of sunglasses should be used differently.

(CAT.1): Light-colored sunglasses suitable for clothing, blocking part of the light and glare of light 43% to 80%

(CAT.2): Sunvisons 18% to 43% daily

(CAT.3): Sunvisons, 8% to 18% daily

(CAT.4): Special purpose more suitable for outdoor sports 3% to 8%

It is important to note that (CAT.4) products are very protective of light and are more suitable for outdoor sports with strong light, such as beaches, skiing and mountain climbing. But conventional use is not appropriate, such as driving, the light is too dark.

In addition, many sunglasses at present have a polarizing function at the same time, generally labeled polarizing. If there is a need for fishing, driving, you can look for products with polarizing function.

UV protection.

For sunglasses, the most important thing is to protect against uv damage to the eyes. As a result, there is usually a small sticker on the frame that is uv-resistant.

However, if the protection of UV rays is not specifically marked.

Lens color.

The color of sunglasses is not the darker the better. Because of the depth of the lens color, the degree of light transmission can be more intuitively reflected (i.e. the transmission ratio mentioned above).

So when we buy every day, according to their own circumstances, choose the right color of the lens, better play the role of sunglasses.

Preferred gray, tea, green gray three colors.

Because the spectral absorption is uniform, will not cause a large color difference, but also can improve the visual contrast and other advantages, in the choice of sunglasses, generally can be preferred as a target.

The color is too light to be suitable for long outdoor use.

Wear sunglasses, but also see their eyes, indicating that the color is too shallow, not suitable for long-term outdoor use.

The color is particularly dark and not suitable for long- and full-day wear.

If you can't see your eyes completely, the surrounding color changes. Indicates that the lens color is too deep, while weakening the color sense, will affect the safety of driving out.

Lens.

When selecting sunglasses, you can take in your hands through the lens to observe the straight lamp, straight building outline slowly moving, to see if there is a surge, bending and other phenomena.

Some non-conforming sunglasses may have slight differences in light, excessive mounting stress, deformation of the object spent wearing, distortion of the object and dizziness.

Based on the top five points, basically you can choose a pair of good sunglasses!

But wearing sunglasses, there are 3 points not to ignore:

1. Color-blind people with weak color resolution due to weak color resolution, it is not recommended to wear darker color, special color products, to avoid further reduce color perception.

2. Glaucoma patients, some may have an effect on eye pressure, recommended under the guidance of a doctor.

3. Older people are not suitable for long periods of time to use darker-colored sunglasses to avoid safety concerns.