UV is an invisible killer,

The eyes are exposed to strong sunlight,

Crystals in the eye can be exposed to too much ultraviolet light

And fiber hardening,

And the damage of ultraviolet to human eyes is cumulative,

It will develop some eye diseases,

Such as cataract, glaucoma, etc.

So what color of lens can protect the eyes most?

1 green lens

Green lens is the representative of pilot series, which can effectively absorb infrared light and 99% ultraviolet light. But green lenses can distort the color of certain scenes. Moreover, its light blocking effect is slightly inferior to that of gray lens, but green is still an excellent protective lens. Green has the function of adjusting eyesight, which is more suitable for students or people with tired eyes.

2 Grey Lenses

The Gray Lens absorbs any chromatogram evenly, so it will darken in case of strong light, but there will be no obvious color difference, showing the true natural feeling, belonging to the neutral color system. It can absorb infrared and 98% ultraviolet. The biggest advantage of gray lens is that the original color of the scene will not be changed by the lens, and the most satisfying thing is that it can effectively reduce the light intensity. Gray can reduce visual fatigue, white-collar workers with more eyes can consider.

3 yellow lens

It can absorb 100% ultraviolet light, and make infrared and 83% visible light penetrate the lens. The biggest feature of the yellow lens is that it absorbs most of the blue light. Because when the sun shines through the atmosphere, it is mainly blue light (which can explain why the sky is blue). After absorbing blue light, the yellow lens can make the natural scenery clearer. Therefore, the yellow lens is often used as a "filter". Yellow is the most sensitive color of visual cells, which can improve the sensitivity of vision. Amblyopia and other poor vision can be preferred.

4 Pink lenses

This is a very common color. It can absorb 95% of the ultraviolet light, and some shorter wavelengths of visible light. In fact, this kind of function is similar to that of ordinary uncolored lens, that is to say, pink lens has no greater protective effect than ordinary lens. But for some people, it's still psychologically helpful because they feel comfortable to wear. There are red and green color blindness or red and green weak person, can choose red lens, it can increase red and green contrast.

5 Brown lenses

This kind of lens absorbs almost the same kind of light as the green lens, but absorbs more blue light than the green lens. Brown lenses cause more color distortion than gray and green lenses, so the satisfaction of ordinary people is also low. But it provides another color choice, and can slightly reduce the blue light halo, making the image clearer.

6 Blue Lens

The beach can wear the sun blue lens, blue can effectively filter out the light blue reflected by the sea water and the sky. Avoid using blue lenses when driving, because it will make us unable to distinguish the color of traffic signals.

In addition to the traditional sunglasses, the so-called "anti radiation, anti blue light, anti fatigue, anti UV" anti blue light glasses have recently become the choice of many people.

The sunlight includes seven bands of "red, orange, yellow, green, blue, indigo and purple". Blue light is one of them, which has relatively high energy.

Blue light is a kind of normal visible light in daily life. The wavelength is about 400 nm, which just falls in the center of the eye, that is, the fovea of the macula. And this part itself is sensitive to strong light, which is mainly composed of optic vertebra cells. If it is stimulated by blue light for a long time, it will suffer some damage.

For people's concerns about the harm of blue light to eyesight, anti blue light glasses have no significant effect on eyesight protection. To protect eyesight, we should pay attention to the health eye, try not to use electronic products for a long time, and do not use the eye for a long time. 

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In a relaxed state, the parallel light passes through the refractive system of the eyeball and focuses in front of the retina, which is called myopia. Myopia is also called shortsightedness, because this kind of eye can only see near but not far. When the eye is resting, the parallel light from the infinite distance, after passing through the refraction system of the eye, gathers in front of the retina to form a focus, and forms an unclear image on the retina. The far vision is obviously reduced, but the near vision is still normal. There are many factors that cause myopia, one is genetic factor, the other is acquired external factor. Here we mainly explain the way to alleviate myopia caused by acquired factors.

(1) Relax:

① Mydriasis therapy: mydriasis with cycloplegia is used. At present, eye drops are given once a day.

2. Convex lens method: first let the patient wear a convex lens with a higher degree, watch the vision meter 5 meters away, relax the ciliary muscle, then adjust the degree of the convex lens, so that the eyesight is basically normal.

③ Overlooking method: after studying or writing for 1-2 hours, you can overlook the natural scenery and relax the ciliary muscles. Keep on doing eye exercises 3-4 times a day.

(2) To improve the excitability and visual function of the visual center:

Direct current therapy for myopia, ear acupuncture, plum blossom acupuncture, acupoint massage, acupoint conduction, Qigong therapy and cold water bath therapy. It is mainly to increase the excitability of the brain's optic center and optic nerve cells, which can improve both the near and far vision.

(3) Improve learning environment: keep a distance of 30cm and correct posture when reading and writing. Pay attention to the natural light and ensure adequate lighting in the room. Combine work with rest, get rid of bad study habits, take a rest of 10-15 minutes every hour, do not lie or walk to read. Pay attention to physical exercise

Of course, there are many specific methods, such as:

1: Stand somewhere, find a distant tree and a closer tree, and then observe the trees near for a while, and then observe the trees far away for a while. This method has the function of adjusting eye muscles and relaxing. When observing, try to look at the details of the tree as much as possible

2: Rub your hands and cover your eyes. Do it again and again. It's relaxing and comfortable. You can do it anytime, anywhere.

3: Sunbathe, when the weather is clear, close your eyes, face the sun, let the light through the eyelids, stimulate the eye cells. Our nearsighted people are very sensitive to light. They will squint or squint when they encounter strong light. This can improve the ability of our eyes to accept light.

4: Sit or stand, look straight ahead first, then move your eyes up, down, left and right, and stretch your eyes in each direction as much as you can, just for a few seconds in each direction. We will find that our eyes are deformed after myopia. This method can adjust our eyes back to normal shape and help to restore the focusing ability of the eyes.

5: More blinking, blinking can alleviate eye fatigue, this is to do at any time.

According to the above methods, combined with reasonable vision correction, I believe that you will feel that your eyesight has indeed improved after a period of time. My friends have tried it for a month, and the eyesight has dropped from the original 400 to 300 degrees. He is still insisting. Listening to him, the effect is very good. You may as well try it.

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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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Many people will wear glasses. Maybe everyone wants to ask if glasses need maintenance?

Now, glasses are very expensive. The price of a pair of glasses is hundreds or even thousands. Therefore, to pay attention to this lens, it is necessary to use special glasses cloth to wipe it. If there are some foreign matters on the mirror surface, such as sand, don't use this glasses cloth to wipe it directly. You should wash it and then wipe it.

When removing the frame, it's better to take it down with both hands at the same time. The mirror of the glasses should not be directly placed on the desktop. It should be directly placed in the glasses box after taking it down. Don't put the frame of the glasses in a place with high temperature or direct sunlight. This high temperature will cause the frame to deform. Then try not to let the frame touch some chemicals, cosmetics or sweat. It may cause the frame to age, accelerate or deform.

Do you know how to maintain your glasses now? 

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