Our reporter Ren Chong

　　Recently, the market for eye care products has been heating up.

Whether it is online learning or the current popular STEAM education (that is, comprehensive education integrating science, technology, engineering, art, mathematics and other fields), electronic screens are often inseparable.

How to reduce the adverse effects of electronic screens on children's vision?

Eye care products came into being.

　　Eye care product sales soar

　　"From the market response, the sales growth of eye-protection TVs and eye-protection tablets is the most obvious." In stores such as Suning.com, Gome, and Yongle, TVs and tablet computers with eye-protection functions are the most named by consumers.

　　According to big data from Shanghai Suning Tesco, the sales volume of eye protection TVs has increased by more than 60% compared with the same period last year; the eye protection tablets have increased by more than 80% month-on-month and more than 60% year-on-year.

　　Liu Zhenya, deputy director of purchasing and sales of the audio-visual multimedia business department of Shanghai Suning Tesco, introduced that in terms of TV products, "eye protection" is not only a large screen size, but also reduces, avoids and even solves harmful blue light emitted by TV screens through hardware optimization and software upgrades. , screen flicker, etc.

He revealed that in the last weekend alone, Suning.com's Zhongshan Park store sold more than 30 sets of eye protection TVs.

Liu Hanzhong, who is in charge of purchasing computers, tablets and other products at the store, said that consumers have a soft spot for large-screen tablets, "If it is leisure and entertainment, light and portable small-screen tablets are very popular; Consumers who use it for study tend to choose a large screen, at least 11 inches." At the same time, OLED screen products are more popular, because OLED screens have softer light than LCDs and are less likely to cause dry eyes.

　　TV and tablet functions have their own characteristics

　　Does the product with eye protection function stand up on the technical level?

Comparing mainstream TV brands, it can be found that although the technologies of different brands are different, the core is the same - increasing the screen, reducing stroboscopic and blue light.

　　According to the relevant staff of Skyworth, in terms of the overall trend of the TV industry, large-size TVs are becoming more and more popular. The mainstream size has reached more than 55 inches, and 100-inch TVs are no longer uncommon.

After the screen size becomes larger, the display effect is challenged, and high-quality clarity, brightness, contrast, color gamut, etc. are required.

For example, the dimming method of the screen determines whether a stroboscopic phenomenon will occur when the TV presents the picture, and the stroboscopic phenomenon can easily cause visual fatigue.

Based on this, most eye protection TVs use DC dimming to fundamentally eliminate stroboscopic.

　　In terms of reducing blue light, Skyworth uses optical anti-blue light.

The relevant TV has an anti-blue light chip to remove harmful blue light from the source; the matching lens allows the light of the lamp beads to spread evenly, optimizing the visual effect.

At the same time, the built-in system of the eye protection TV can automatically track the strength of the input signal, adjust the brightness of the backlight, and prevent the screen from being dazzling due to excessive light.

According to the relevant staff of Hisense, the eye protection function of its laser TVs is the most recognized, because laser TVs are different from TVs with OLED or LCD screens. They rely on reflected light for imaging, naturally without stroboscopic, and without direct stimulation to the eyes.

　　In the tablet computer market, the "eye protection" function is also reflected in the display mode, and "paper-like screen" products specially designed for online education have appeared, including BOE's small lesson screen and seewo learning machine.

　　From the perspective of product parameters, "paper-like screen" tablet computers have several commonalities: the screen is large - the largest exceeds 21 inches; the use of diffuse reflection screen - similar to the kindle screen, the light is soft; with AI intelligent dimming function , can automatically adjust brightness, color temperature, etc. according to environmental conditions, simulate the look and feel of paper in different environmental color temperature and brightness; built-in use time reminder, brightness reminder and other eye protection monitoring technologies to guide consumers, especially small consumers, scientific and reasonable Use screens; built-in learning-related content.

　　"'Paper-like screen' is not the latest technology, but it is optimized according to consumption characteristics in learning scenarios." According to relevant personnel of BOE, the human eye feels more comfortable watching "paper-like screen", and it is not easy to cause visual fatigue, because a qualified "Paper-like screen" has the functions of low blue light, no stroboscopic, anti-glare, intelligent photosensitive and so on.

　　Tang Yu, a senior 3C market researcher, said: "At the technical level, consumers should pay the most attention to the display method of eye-protection TVs and tablet computers. As for other functions, ordinary TVs or tablet computers can be implemented."

　　Do not rely too much on eye protection

　　From the experimental data, many technologies do help to protect vision, but ophthalmologists point out that eye protection cannot be overly relied on.

　　Xu Kai, chief physician of the Department of Ophthalmology of Shanghai Children's Hospital, said that with the development of electronic technology, people's study and work are more and more dependent on the visual display terminal (VDT). increasingly common.

Therefore, the "paper-like screen" featuring low blue light and no stroboscopic has attracted much attention.

However, some studies have shown that after 30 minutes of randomly watching videos on a "paper-like screen" and a TV screen, both screens cause the subjects' blinking frequency to increase, but watching a TV screen is more likely than watching a "paper-like screen". visual fatigue.

Therefore, "paper-like screens" cannot completely solve problems such as visual fatigue, and consumers cannot think that after using "paper-like screens", they can watch videos for a long time.

Moreover, the "paper-like screen" products are closer to the eyes, and the degree of horizontal exophoria is greater when looking closer.

　　He also reminded that the built-in eye protection mode of mobile phones, tablet computers and other electronic products also has limitations. Different screen display methods are often used to reduce blue light, including reducing the screen brightness (adjusting the screen brightness according to the ambient lighting), reducing the display color temperature, reflecting Change the screen color mode (change the light mode of black characters on a white background to the dark mode of white characters on a black background), reduce the brightness contrast of the text/background, change the color of the text/background, etc.

Although they reduce blue light, the damage of blue light depends on the dose, and the damage caused by low-intensity long-term radiation is equivalent to that of high-intensity short-term radiation.

Therefore, it is not recommended to stare at the electronic screen for a long time.

　　For those who need to learn online, Xu Kai recommends that you try to ensure more than 2 hours of outdoor activities every day, and maintain a correct reading and writing posture. After reading, doing homework, or using the electronic screen for 20 minutes, look up and look 20 feet (6 meters away) ) for more than 20 seconds, allowing the eyes to get enough rest.