How to choose sunglasses and how to clean them.

Now that the sun is getting bigger and bigger, many people will wear sunglasses, which is simply a must-have item for going out in summer. As we all know, there are many brands of sunglasses, and there are also many kinds of lenses and frames of sunglasses. So how to choose sunglasses? How to clean sunglasses?

How to choose sunglasses

Although wearing sunglasses can increase the star temperament, cover the face and acne, and save makeup time, there are still some homework to do before buying or wearing.

1. Pay attention to the material when choosing. If it is too light, it will be cheap, and if it is too heavy, it will increase the burden. Recommended style of metal temples, moderate weight and good texture.

2. Too much decoration or exaggerated modeling is not easy to control. Please do your best. If you insist on buying it, you should match it with your clothes, such as bows, ribbons and other exaggerated details.

3. Never use ammonia, bleach or glass cleaner to clean sunglasses. You can use warm water mixed with soapy water to clean and dry them, or use professional glasses cleaner.

Choose the style of sunglasses according to your face.

Wear a round-faced box

Reason: Dare to wear a round frame and let the whole world know that you have a pie face.

Step 2 wear a round frame on your face

Reason: Add a little rounded lines to make it less sharp. But the box size should be moderate, too big and too small are a bit funny.

Step 3 wear a big frame and a long face

Reason: small face and few words.

Step 4 wear a flat frame on your face

Reason: personality is extra points, but please pay attention to Asian girls, try it on and see if a fortune teller can see it before deciding whether to buy it.

How to clean sunglasses

Dust or dirt on the lens can be removed with soft cotton cloth or special lens wiping paper. When cleaning, do not aim the sunglasses directly at the faucet, and clean them hard. If the lens has stains, oil stains or fingerprints, clean it with lens cleaner after wiping to keep the appearance of sunglasses.

It is best not to use your hands or nails to remove stains from sunglasses. In order to save trouble, many people will put sunglasses that are not put in the glasses case into their pockets or trouser pockets, which will easily make them scratched by the edges and corners of objects such as keys or combs, so this must not happen. And don't hang sunglasses on your head, so as not to break the hook. Take it off carefully when you don't wear it. When putting them, put them in a hard mirror box with the mirror face up to avoid the lens facing down.

Sweat or grease on the skin can easily corrode the metal parts of the frames. Mastering how to clean sunglasses is conducive to prolonging the life of sunglasses.

Characteristics of lenses with different colors

Dark green lens

While absorbing light, let the green light reach the eyes to the maximum extent, so it has a cool and comfortable feeling, which is suitable for people with tired eyes. However, due to the low transparency and clarity, it is suitable for wearing in the sun and not suitable for driving.

Gray lens

Balanced absorption of any color spectrum, so the scene will only darken but there will be no obvious color difference, showing a true and natural feeling.

Brown lens

It can absorb purple and cyan in light, absorb almost 100% of ultraviolet and infrared rays, and block reflected light on a smooth and bright surface. The wearer can still see the subtle parts clearly, which is an ideal choice for the driver.

Blue lens

Sunglasses are the most popular color, which can effectively filter the light blue reflected from the sea and the sky, and are suitable for wearing when going to the seaside.

Mercury lens

High-density mirror coating is used on the lens surface. Such lenses absorb and reflect more visible light and are suitable for outdoor sports people.

Yellow lens

Strictly speaking, this kind of lens does not belong to sunglasses, because it hardly reduces visible light, but in foggy days and dusk, yellow lens can improve contrast and provide more accurate visual images, so it is also called night vision goggles. It is common to wear yellow lenses as filters when hunting and shooting.

Light blue and light pink lenses

A lens that is more decorative than practical.

When is it inappropriate to wear sunglasses?

1, sunglasses are not suitable for glaucoma. After wearing sunglasses, the visible light entering the eyes is reduced, and the pupil will naturally become larger, resulting in the narrowing of the anterior chamber angle and poor drainage of aqueous humor. After a long time, it is easy to induce acute angle-closure glaucoma, with envy, eye pain, headache, sharp decline in vision, and even nausea, vomiting and other systemic symptoms. Therefore, people with glaucoma or suspected glaucoma should not wear sunglasses.

2. Sunglasses should not be worn in places with poor light. Some people wear sunglasses regardless of time and place, whether outdoors or indoors, whether the sun is strong or weak, even at dusk, in the evening and when watching movies and TV. Doing so will increase the burden on the eyes, cause eye muscle tension, blurred vision, and even dizziness, long-term inability to see clearly and other symptoms of visual fatigue.

Children under 3.6 should not wear sunglasses. The visual function of children under 6 years old is not yet mature. Wearing sunglasses for a long time will not effectively stimulate the macular area of the fundus, affect the further development of vision, and even form amblyopia.

4. Be careful when wearing sunglasses with big frames. Nowadays, many fashionable young people prefer to wear sunglasses with large frames, with wide sides, thick frames and heavy weight. In fact, after wearing this kind of glasses 1 ~ 2 weeks, the wearer will have symptoms such as numbness between his eyes or cheeks, and his nose will feel uncomfortable when breathing, just like catching a cold. Others feel insects crawling on their faces, numbness in their upper gums, discomfort in their upper front teeth and sore eyes. This is because people's facial sensation is mainly dominated by trigeminal nerve, and the suborbital branch of trigeminal nerve passes through the suborbital foramen at the lower edge of the orbit. Thick-framed, wide-brimmed and heavy sunglasses often press the suborbital branch of trigeminal nerve, thus causing sunglasses syndrome.