To protect mobile phones
Many people are used to putting protective film on mobile phone screens
Reporter's investigation found
There are many mobile phone films sold in the market
In addition to protecting the screen
Some merchants also claim
Own mobile phone film can not only prevent voyeurism
It can also "protect eyes"
Are these statements reliable?
I used two months of anti-peeping film
Man becomes myopic
In May this year, an experience shared by netizens caused heated discussion: after two months of using the anti-peeping film on the mobile phone, his vision increased from normal to 300 degrees, and reached 475 degrees a year later. This case makes people wonder:
Is the anti-peeping film really safe while protecting privacy? To answer this question, you need to first understand the principle of anti-peeping membrane.
The working principle of the anti-peeping film is to limit the viewing angle of the screen through a special micro blind structure to ensure that only people facing the screen can see the content clearly. But while protecting privacy, this design actually brings a considerable potential burden to the eyes.
Miniature blinds Optical technology is like the blinds in life that use the concave and convex direction of the blades to achieve lighting while blocking the outside world's line of sight. The technology of anti-peeping film is similar to that of it. After the anti-peeping film is attached to the mobile phone, people who are using the mobile phone can clearly view the content displayed on the screen at 90 degrees on the front, but the left and right are less than a specific degree, such as the side of 25 degrees and 45 degrees, the content of the screen cannot be seen.
This is because of the existence of the blind structure in the anti-peeping film. Only some of the light emitted by the screen can be received by the eyes, so the light intensity will decrease, and the user will find that the screen brightness is darker than before using the anti-peeping film.
Study shows that the brightness of mobile phone screens decreases by about 1/3 after the anti-peeping structure is installed.
How much does the anti-peeping membrane hurt the eyes?
No scientific research has confirmed whether the anti-peeping membrane will directly harm the eyes, but the changes in the mobile phone after applying the anti-peeping membrane may cause discomfort in the eyes.
Screen brightness and contrast decrease: Some anti-peep film structures on the market block some light, resulting in a significant decrease in screen brightness. In order to see the content clearly, users often unconsciously turn on their phones or look closer. Both of these behaviors will aggravate the regulatory burden on the eyes, which is so easy to cause visual fatigue in the long run.
Light scattering and clarity reduction: The blind structure of the anti-peep film may cause light scattering, resulting in insufficient display of the screen. Research points out that when the human eye is in a "fuzzy environment" for a long time, the ciliary muscles will continue to tense, causing the so-called "pseudo-myopia".
Strobe and blue light problems: Some low-priced anti-peeping films lack the anti-blue and anti-strobe functions. The superimposed blue light radiation on the mobile phone screen itself may further damage retinal cells and increase the risk of macular lesions.
This anti-peeping film
Is it necessary to use it?
The function of anti-peeping film lies in privacy protection, especially for some groups that need to process sensitive information in public places. However, for most ordinary users, such strict anti-peeping functions may not be required when using mobile phones in daily life.
People who have the following situations are recommended to choose to use anti-peeping membranes with caution:
There are already vision problems such as myopia and astigmatism;
Daily screen usage time exceeds 4 hours;
Repeat mobile phones in dim environments.
If you must use anti-peeping film, it is recommended to choose a product with high light transmittance and anti-blue light certification, and try to shorten the continuous use time.
The impact of anti-peeping membrane on the eyes is usually gradual. When the following symptoms appear, beware of the possibility of being related to the anti-sight membrane, and replace the ordinary membrane or seek medical examination in time:
The visual object is blurred or ghosted, and even if the screen brightness is adjusted, there is no relief;
Eye fatigue caused by frequent dry eyes and soreness and swelling, and anti-snooping membranes may aggravate dry eyes;
Heart or dizziness, long-term difficulty in focusing may cause neurological discomfort;
The short-term vision has significantly decreased. If the netizens are in the case, they need to go to the ophthalmology department for treatment in time.
In fact, protecting privacy does not necessarily require relying on anti-peeping films. Adjusting usage habits is also effective, such as reducing the frequency of viewing sensitive information in public places, or using the privacy and anti-peeping function that comes with the mobile phone.
Anti-peeping film is not a "flood" but its potential impact on eye health cannot be ignored. Between privacy and eye protection, users need to make reasonable choices based on their own needs. The original intention of designing high-tech products is to serve people, not to make people pay a healthy price for convenience. Only by making rational choices and scientific eye protection can the screen truly become a helper of life.
Whether we use anti-peeping film or not, we must pay attention to the time, screen brightness, etc. when using electronic products. After feeling eye fatigue, we must stop using it immediately and look into the distance.
Eye protection habits
Follow the 20-20-20 rule
Every 20 minutes, let your eyes rest for 20 seconds and look 20 feet (about 6 meters) away, which can effectively relieve the tension and fatigue of the eyes and promote the relaxation of the eye muscles.
Adjust the screen position and brightness
Position: Place the electronic screen at about 10-15 degrees below the horizontal line of the eye to reduce pressure on the eyes and neck. Keep the distance between the screen and the eyes at 50-70 cm, ensuring that the line of sight slightly downward forms a certain angle.
Brightness: Adjust the brightness of the screen to coordinate with the surrounding ambient light to avoid being too bright or too dark.
Keep appropriate eye distance and angle
When using electronic devices, it is crucial to maintain appropriate distances and angles. The distance between the screen and the eyes should be at least 80 cm to reduce the pressure on the eyes. At the same time, pay attention to adjusting the seat height and angle to ensure a comfortable and natural vision.
Keep good eye-using habits
Keep your body upright and put your feet flat on the ground, avoiding looking at the screen for a long time.
Increase the number of blinks to keep the eyes moist and relieve dry eyes symptoms. Avoid rubbing your eyes with your hands to reduce the risk of bacterial infection.
Balanced nutrition, eat more eye-protection foods
Eat more foods rich in vitamins A, B1, C, E, lutein and zeaxanthin, such as carrots, spinach, broccoli, kiwi, walnuts, etc. These foods help protect the eyes from free radical damage and maintain vision health.
Source丨CCTV Comprehensive Qianjiang Evening News, Xi'an Jiaotong University First Affiliated Hospital, Guangxi Disease Control and Prevention
