"Laser TV has no radiation, and long-term viewing will not cause eye fatigue." "Visual comfort is more than 20% higher than paper reading!" Under the epidemic, online classes have become the daily life of many children, and TV manufacturers have also aimed at this. A "business opportunity" has persuaded parents to use laser TV as their first choice, and they have hyped up various eye protection functions.
Does the laser TV, which is the main health card and costs 20,000 to 30,000 yuan, really protect the eyes?
During the reporter's visit, the sales staff not only disagreed on the statement of "who protects the eyes and who hurts the eyes", but also the test reports displayed were contradictory.
■ anxiety
No matter how expensive it is for the child, I have to buy it
"It's expensive, but for the sake of the children, this money has to be spent!" Mr. Nie, who lives in Chunfengheyuan in Fengtai District, gritted his teeth and finally bought a Changhong 90-inch 4K laser TV.
In the sound of "Di Di", the POS machine at the cashier spit out a small receipt, showing that the consumption amount was 20,000 yuan.
This price is much higher than the price of LCD TV.
Taking the best-selling 70-inch TV on the market as an example, a Changhong 70-inch 4K ultra-high-definition LCD TV costs only 3,299 yuan.
Eye protection has become the most important reason for Mr. Nie to buy a laser TV. "Children need to protect their eyesight during online classes."
Affected by the epidemic, children spend more time in online classes.
"There are 6 classes a day, and each class is about 40 minutes. It is equivalent to staring at the electronic screen for at least 4 hours a day." The mother of the student Xiaohao said that worrying about the increased burden on her children's eyes has become the hottest topic among parents recently.
"It's only the fifth grade of elementary school, and 20 of the 35 students in the class are myopic. If you keep staring at the screen like this, the myopia will probably deepen!"
■ Contradictions
Test reports vary
"Laser TV is definitely the first choice to buy a TV for your child!" In the Suning.com Huiju store, the salesperson of Hisense Laser TV simply said: "The visual comfort of this TV is 20% higher than that of reading a book!"
While tapping on an 88-inch laser TV screen, the salesperson told reporters that the TV screen is a "board", which does not emit light by itself, and does not stimulate the child's eyes with direct light sources, just like a child looking at a blackboard in a classroom. of.
In addition to not emitting light, "it's okay to see it up close" has also become the main selling point of laser TV sales.
"Such a big TV, seen so close, can a child's eyes stand it?" Inside the store, Ms. Lu, a citizen, couldn't help but question.
The salesperson responded decisively: "It's okay! Watching laser TV can be closer."
A comparison chart of the viewing distance between LCD TVs and laser TVs is also displayed on the floor of the store: a 75-inch laser TV only needs to be separated by 2 meters, while only a 43-inch LCD TV can be viewed at the same distance.
In order to prove what he said was "reliable", the sales staff also showed the reporter a "laser TV visual health test certificate", which was made by the ophthalmology expert team of Peking Union Medical College Hospital and the Saixi Laboratory of China Institute of Electronic Technology Standardization. In an evaluation, the result is: watching LCD TV for a long time will cause certain eye swelling, eye pain, and dry eyes, while watching laser TV, the subjects have no obvious vision changes and eye discomfort, which is more conducive to eye protection. of health.
"The background color of the LCD TV looks very bright, and the eyes can't stand it after a while. Many children have become short-sighted because of this. But no matter how you look at the laser TV, the eyes will not fatigue, and there is no radiation." Changhong Laser TV The sales staff gave The reporter made an analogy, "LCD TVs are like sunlight, and laser TVs are like moonlight."
Surprisingly, as soon as the reporter stepped out of the Hisense store, the salesperson of the Sony store next door took the initiative to stop the reporter and said, "Buy an eye-protection TV for your child? Laser TV is the most eye-injuring! Don't be fooled. People are fooling you." The sales staff of the Skyworth store also directly "disassembled", saying that laser TV hurts the eyes the most.
"You can measure it yourself. Turn on the camera mode of your mobile phone and you can see how much the laser video flashes, which is more likely to cause children's visual fatigue."
In order to prove that what he said was true, the salesman also showed reporters a test report from Beijing Children's Hospital, which showed that "4K large-screen LCD TVs have less impact on the visual fatigue of human eyes than laser TVs, and the eyes are healthier. "
■ Investigation
The principle explanation is completely different
How does laser TV protect or hurt eyes?
During the interview, the reporter found that not only did the sales of the same category of TVs have "infighting", but also the interpretations of the sales of different categories of TVs were completely different, which made people disagree.
"Laser TV eye protection is due to the principle of diffuse reflection. After diffuse reflection to the screen, the picture is presented to the eyes, which is not so dazzling." The sales staff of Hisense praised the diffuse reflection.
When the reporter proposed that the brightness and color saturation of the laser TV were significantly lower than that of the LCD TV, the salesman argued excitedly that it is precisely because the brightness of the laser TV is not so high, so the eyes are protected.
"LCD and OLED TVs are very bright, but it's not a natural color, and it hurts the eyes."
Changhong's sales staff attributed the laser TV's eye protection to the size first. Large-size TV screens will increase eye movement to a certain extent, avoiding dry eyes and fatigue due to long-term focus.
At the same time, according to what he said, the manufacturer has a newly upgraded visual algorithm, which can effectively isolate 99.99% of harmful short-wave blue light below 450 nanometers. "You must know that blue light is the most harmful to the eyes."
However, the most eye-injuring blue light in his mouth came to another salesperson, but it became "unsubstantiated", "At present, there is no direct evidence that blue light causes myopia, and some advertisements claim that no harmful blue light can protect the eyes. , there is no scientific basis at all.”
Sony TV sales staff pointed the finger at "diffuse reflection", accusing it of using misunderstandings to fool consumers.
"Everyone thinks that this product is reflected light, and the screen is not so bright, so it is more eye-friendly. However, when used at home, it is affected by ambient light during the day, and the color rendering, brightness, sharpness, contrast and other aspects of laser TV cannot be improved. Instead, It will make the eyes stare hard and increase eye fatigue.”
All kinds of contradictory statements, let ordinary consumers fall into the clouds.
■ Recommendations
Scientific eyes follow "320"
"Scientific eye protection cannot be solved simply by purchasing an eye protection TV." Zhu Jianbo, Optometry Center of Ophthalmology, Beijing Tongren Hospital, said that at present, the number of children and adolescents suffering from myopia is increasing, and the age of onset of myopia is increasing. The younger you are, and the younger you are, the progression of myopia is usually faster and more serious.
Zhu Jianbo explained that the main cause of myopia is that the eyes are used too much at close range, and there are few outdoor activities, and the children's eyes cannot have a sufficient distance adjustment.
There are also some genetic and nutritional factors.
"The key to using eyes in science is correct reading and writing posture, such as one punch from the body, one foot from the book, and one inch from the tip of the pen."
"Scientific eye use should also follow the '320' principle. When using the eye at close range for 20 minutes, take a 20-second rest, look at a place 20 feet (6 meters) away, and reasonably control the 'screen time'." Zhu Jianbo said, ophthalmology department The consensus of doctors is to advocate that children spend no less than two hours a day in outdoor activities, and no less than ten hours a week, and the effect of outdoor activities in the sun will be better.
Our reporter Yuan Lu