At the press conference of the leading group for epidemic prevention and control in Shanghai, it was announced that senior three and junior three of the city would return to school on April 27, and all colleges and secondary vocational schools could arrange the return of graduating students from April 27. All kinds of schools at all levels shall make preparations for other sections and grades to return to school in batches before May 6.

During the epidemic, the time for students to start school has been delayed. At present, in addition to graduating students starting to return to school, a large number of students still have to continue online classes at home. During the online classes, children need to use mobile phones, computers and iPads. For children, watching electronic screens for a long time will produce eyes for children in the growth and development stage Great harm, causing eye fatigue, near vision loss and other consequences.

As a result, Dr. Hua Haimei, director of Nutrition Department of pediatric hospital affiliated to Fudan University, specially prepared a scientific diet and eye protection book for parents and children during online classes.

According to Dr. Hua Haimei, the following nutrients and foods rich in these nutrients have a protective effect on children's eyes. Parents are suggested to supplement more nutrients for children during online classes.

1、 Provitamin A and vitamin A

Vitamin A is an important raw material for the formation of eye photosensitive substances. Vitamin A is sufficient, which can increase the smoothness of the cornea and make the eyes bright and vivid. There are two main forms of vitamin A: Pro Vitamin A (mainly β - carotene from plants) and formed vitamin A.

Beta carotene can be converted into vitamin A in the body. Therefore, fruits and vegetables containing β - carotene are good sources of vitamin A.

Vitamin A from animal food mainly exists in animal liver, cod liver oil, eggs, milk and their products; β - carotene and various carotenoids from plant food mainly exist in green leaf vegetables, yellow vegetables and fruits, such as broccoli, pea seedlings, spinach, carrots, sweet potatoes, Lycium, etc. Vitamin A contained in animal food or supplements is the formed vitamin A. if it is over supplemented, it will cause more poisoning than the original vitamin A contained in plant food.

2、 Carotenoids (lutein and zeaxanthin)

In the carotenoid family, only zeaxanthin and lutein exist in the retina of the eye. They can absorb the blue light that strongly damages the retina, protect the retina from damage, and keep the vision sensitive and clear. Foods rich in lutein include spinach, broccoli, onion, amaranth, asparagus, rape, etc. The foods rich in zeaxanthin include corn, pumpkin, orange, spinach, mustard, etc.

3、 Anthocyanin

Anthocyanin can strengthen capillaries, stabilize the microvasculature of eyes, and enhance the circulation of microvasculature. In addition, anthocyanin is also a strong antioxidant, which can reduce the damage of free radicals to the eyes and improve vision. Rich in anthocyanins: blueberry, blackberry, strawberry, grape, cherry, purple radish, carrot, pomegranate, purple rice, etc.

4、 DHA

DHA (c22:6, n-3) is the most abundant polyunsaturated fatty acid in photoreceptors of retina, which is necessary to maintain the normal function of rhodopsin. However, we can not synthesize this fatty acid by ourselves. DHA supplementation will make the vision sharper and clearer. In addition, DHA is also an important component of brain neurons. Food rich in DHA: deep sea fish, such as salmon, salmon, etc.

5、 Zinc

It can promote the metabolism and physiological function of vitamin A, and help to maintain visual health. If there is not enough zinc, it will lead to vision loss and blurred vision under low light. Zinc rich food: shellfish and mollusc seafood, animal liver, lean meat, black sesame, hazelnut, walnut, etc.

6、 Vitamin E

Vitamin E has a strong antioxidant, it can reduce the free radicals in the eyeball, play a role in protecting the eyes. Foods rich in vitamin E: all kinds of vegetable oil, nuts, beans and seafood, etc.

7、 Vitamin C

Vitamin C can prevent the retina from being damaged by ultraviolet rays, prevent the lens from aging, increase the toughness of small blood vessels in the eyes, repair cells, and help improve the health of the eyes. Vitamin C mainly comes from fresh fruits and vegetables. Generally, dark vegetables, oranges, grapefruits, kiwifruit, fresh dates, grapefruits, green peppers, strawberries and other contents are high. The preservation time and cooking methods of vegetables and fruits have different degrees of damage to vitamin C.

8、 Vitamin B2 (riboflavin)

Riboflavin is a coenzyme of many flavinases in the body, which is widely involved in the redox reaction in the body. If riboflavin is deficient, the conjunctival congestion, shame, blurred vision and other symptoms will occur. The main sources of riboflavin are eggs, lean meat, milk, beans and cereals.

Dr. Hua Haimei reminded that although food has the effect of protecting eyesight, children must remember that the maintenance of good eyesight is to pay attention to eye hygiene at ordinary times, so that food can really protect our eyesight. 

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The sun's ultraviolet rays can damage the eyes and skin, and sunglasses are vital protection. To some extent, they are a health product that helps prevent cataracts and macular degeneration, but also a fashion accessory.

However, the price of sunglasses in European and American countries is generally hundreds or even thousands of dollars. Why is the price so expensive?

Sunglasses are made of glass or plastic, specifically acrylic, polycarbonate, CR-39 or polyurethane. The frame is made of plastic, nylon or metal. These materials will become lighter, more flexible and more scratch resistant, but none of them involve revolutionary processing methods or materials, or require billions of dollars in research and development costs.

The cost of making sunglasses is much cheaper than what the price tag says. Sunglasses, which cost hundreds of dollars, cost just over 120 yuan, and are often made in China.

In fact, the sunglasses industry in Europe and America is actually a monopoly industry: it is mainly controlled by an Italian company named rosaortica. Haven't you heard the name? But you must have heard about their brand, because this company controls everything about luxury goods. They have the sunglasses of Armani, bobari, Chanel, Gucci, dujiabanna, Migao Kos, miumiao, Oakley, Oliver pipas, sun, Prada, Ralph Lauren, ray ban, Tiffany, Versace and other brands.

It's not over! Rosaortica has 9000 retail stores around the world. If you go to the mall, you must run into the company's brand sunglasses store. The giant also dominates the myopia Market: all "bright view", pearl vision, Sears optics, and target optics stores have rosaortica group branded frames.

In addition, rosaortica group also owns eye Med vision care, the second largest vision insurance company in the United States. In 2018, it was merged with France's Evian, one of the world's largest manufacturers of glasses and contact lenses. This behemoth is now called "isillosa otica.". If you have sunglasses, or nearsighted glasses, you probably already own the company.

Leonardo de vicher, founder of rosaortica group, is a godfather. People in the industry try to avoid mentioning his name. "To be honest, he was guided by fear," said a former rosaortica executive Even his daughter admitted in a biography that she was afraid of him.

Rosa ortica's price hike on sunglasses is crazy, reaching 1000% or more. In 2019, the founder of bright view told the media: "you can buy amazing good frames for $4 to $8, the quality is up to the level of WarBy Park, and the designer level frames can be bought for $15, just like Prada glasses. The price of really expensive glasses is ridiculous. It's a complete fraud. "

Of course, the designer's work is original design, which may be composed of luxury materials, or even elaborately made. But everyone knows that what customers really pay is the designer's name and logo. So do sunglasses.

From the perspective of sunglasses pricing, just like watches, the demand for sunglasses of luxury brands will increase with the price rise. Why is that? Because people want and expect to pay a lot of money for this kind of goods! And rosaortica is probably happy to cater to this demand.

As we all know, sunglasses are a fashion. A good tool for every real Hollywood actor to show his charm is an excellent pair of sunglasses. Between fashion and health, what can you do without sunglasses?

Oddly enough, antitrust agencies in Europe and the United States seem to turn a blind eye to sunglasses giants. European and U.S. Federal Trade Commission gave a green light to the merger of ISIL and rosaortica. "This has never happened in the seven centuries of eyewear industry," the guardian exclaimed at the time

In fact, there are some cheap sunglasses brands in the European and American markets. Brands like goodr and knockaround cost a fraction of the price of luxury sunglasses. In addition, WarBy park has also achieved success in many product lines with moderate prices in the past decade. However, it is extremely difficult to play with monopolists, and it is not easy to compete in price and value when so many people in Europe and the United States regard sunglasses as a kind of luxury.

As long as a company monopolizes the sunglasses industry in Europe and America, it can set its own price. "It's all worth the money that people are prepared for," rosaortica's chief executive said on the 2012 show 60 minutes

He was right, but in the worst way. Consumers in Europe and the United States can buy Sunglasses anywhere, but if you want to buy Sunglasses that people think are good, you have to pay the price Rosa ortica told you. 

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