Most parents only know that TV, computer, mobile phone and iPad hurt their children’s eyes, but they don’t know the truth that these products hurt their eyes – blue light. However, watching cartoons on iPad is ten times more harmful than watching TV. So how to protect your eyes?

● tablet computers and touch-screen mobile phones should not be used as early childhood teaching aids. If you want to use them, do not exceed 15 minutes each time

Many young parents often use iPad and smart touch-screen mobile phones as “teaching aids” for their children’s early education, but they do not know that this may make their children become “small glasses” early. Recently, a wechat hot Post said that “playing 20 minutes of iPad, tear film rupture time is equivalent to dry eye patients”, causing many parents’ concerns.

Lu Jinhua, senior optometrist at Sun Yat Sen Eye Center, Sun Yat sen University, pointed out that tablet computers and large screen smart touch-screen mobile phones cannot be used for early education. Using touch-screen mobile phones to cut fruits can stimulate the ciliary muscles of the eyes 16 times as much as watching TV at a distance of 3M, while using iPad to watch cartoons can stimulate the ciliary muscles 10 times as much as watching TV.

Look at the mobile phone for 20 minutes

According to the post, “three medical staff of Zhejiang Eye Hospital conducted a four-day experiment with their children. The results showed that: playing 20 minutes iPhone, the average vision of the three children was close to mild pseudomyopia; playing 20 minutes iPad, the tear film rupture time was equivalent to that of dry eye patients; playing 10 minutes hand machine, equivalent to watching 30 minutes TV.”

“There’s a point in this post. In fact, we’ve got more data than we said in the post. ” Lu Jinhua said that the biggest problem of portable electronic products is the use of eyes that lead to close, high precision and high tension. People look far and near, and have a lot to do with the regulation ability of the ciliary muscle of the eye. “Usually, the smaller the screen is, the closer the eye is to the screen in order to see clearly, and if the distance between the objects is halved, the stimulation of ciliary muscle regulation will double.” He said that when watching TV at a distance of 3 meters, the stimulation to the ciliary muscle is about 0.3 unit; when adults use desktop computers, the average distance between the eyes and the visual aids is 1 meter, and the stimulation is 1 unit; when using iPad, the average distance between the eyes and the visual AIDS is 0.3 meters, and the stimulation is 3 units; when using touch-screen mobile phones, the average distance is 0.2 meters, and the stimulation is 5 units, almost 16 times that of watching TV.

“The second big danger of using portable electronic products for a long time is that people often forget to blink because they focus on the screen.” Lu Jinhua said that every blink of an eye, tears will form an extremely thin tear film on the cornea surface, which can wet the eye. Without blinking for a long time, the tear film breaks down for a short time, and the water on the cornea surface evaporates quickly. People will feel dry and tired in the eyes. Over time, this temporary dry eye symptom is likely to become dry eye disease.

Too early contact with electronic products, as soon as kindergarten

According to the statistics of the optometry and optometry center of Zhongshan ophthalmology center of Sun Yat sen University, the age of children’s glasses matching due to myopia has been moving forward in recent 30 years. “Most of the ‘post-80s’ generation are short-sighted after graduation from primary school, while the peak of’ post-90s’ is in primary school.” Lu Jinhua, who has been conducting myopia prevention and control education in primary and secondary schools in Guangzhou all year round, said that it is not exaggeration to say that “after zero” or even “after zero” would be matched when they were studying in kindergartens.

Nowadays, quite a lot of children, from the age of one or two, use tablet computers or smart phones to watch early education cartoons and play intelligent games. “When children, especially children, use portable electronic products, their eyes are closer to the screen because their hands are shorter than adults.” Lu Jinhua said that children’s self-control is poor. When they are attracted by tablet computers and wonderful pictures, it is more difficult to keep reading distance, which will cause more damage to their eyesight.

Recently, a primary school in Wuhan added iron railings to desks to prevent myopia by increasing the distance between students and textbooks. In this regard, Lu Jinhua believes that this move has positive significance, but it is difficult to completely block the occurrence of myopia. “In the past, the main cause of myopia of primary school students was lying reading and writing, but now it has become a mobile phone and tablet. It’s not enough to prevent myopia in class. “

It should also be noted that some early learning machines and learning machines under the banner of “eye protection” have considerable eye injury effects. “This kind of machine is characterized by small screen size, even smaller than iPad, low resolution, dark screen and unclear image.” Lu Jinhua said that from the perspective of myopia prevention and control, the smaller the visual standard and the lower the resolution, the greater the stimulation of vision, and the greater the brightness contrast between the screen and the background will also increase the risk of myopia.

Expert weapon

Auxiliary education TV is better than early education machine

As the father of a five-year-old, Lu Jinhua suggests that parents should pay attention to the following principles when using electronic products to assist early education:

1. Do not let children use electronic products alone, and urge children to keep a distance of 30cm from the screen.

2. Try to reduce the time for children to use electronic products, no more than 15 minutes at a time.

3. According to the size of the screen, the stimulation of common electronic products to eyesight is from low to high: TV (strictly keep 3M distance) & lt; desktop computer (strictly keep 1m distance between eyes and screen) & lt; Laptop & lt; tablet & lt; early childhood education machine & lt; smartphone. Therefore, if it is necessary to use electronic products for early education, please try to choose to play CDs on TV.

4. Don’t turn off the light and play with the mobile phone at night, so as to avoid “dazzle” caused by too large contrast between the background and the screen brightness. Dazzle can pay more attention to fatigue, resulting in increased risk of myopia.

5. Try to make sure the children are outdoors for three hours every day.

The above is the related knowledge of protecting children’s eyesight to avoid electronic products introduced by Baibai safety net. We should always remind that the blue light hidden in these fluorescent screens will hurt our eyes a little bit, and when you find out, you will often regret later! If you have any questions about children’s home-based knowledge such as electric shock prevention, please continue to pay attention to Baibai safety net children’s electric shock prevention common sense column.