With the development of science and technology, people pay more and more attention to personal privacy protection. In order to prevent their information on the Internet from being peeped by people around them, anti-peeping film came into being.

However, many netizens believe that anti-peeping film is a waste of money and may even cause damage to the eyes! The concerns of many netizens have also made this related topic a hot search on Weibo, attracting widespread attention. So, does anti-peeping film really hurt the eyes? How does it hurt the eyes? What is the anti-peeping principle behind it?

What is the principle of privacy film?

The anti-peeping film uses the characteristics of light penetration, refraction, reflection, and diffuse reflection to change the internal structure of the mobile phone film to prevent peeping. The principle of the mobile phone anti-peeping film is similar to that of Venetian blinds , which reduces the structure of Venetian blinds to one ten-thousandth of a millionth, and controls the viewing angle of the mobile phone screen through the parallel arrangement of grating structures .

The interval between the gratings is generally 0.01-0.1 mm. The light from the mobile phone screen cannot penetrate outside the viewing angle. By adjusting the grating angle, visual blocking can be achieved at different angles, thereby preventing others from peeping.

After applying the anti-peep film, the content displayed on the screen can be seen normally from the front or top and bottom of the phone, but from the left and right sides of the phone, only a pure black screen can be seen, and the specific content cannot be seen at all.

However, the refraction at the edge of the privacy film will produce colorful halos, and the screen content will become blurred, which will have a strong impact on the human eye and cause visual fatigue. Watching for a long time will cause illusions in the human eye, causing dizziness and blurred vision, which will damage vision.

Moreover, after applying the anti-peeping film, the brightness of the mobile phone screen will decrease, and the screen brightness needs to be increased to achieve the original visual effect, which is actually not good for eye health.

The main causes of eye damage caused by mobile phones (TV)

There are two main types of light that the human eye receives: passive light—all diffuse light, such as the natural light environment we observe; active light—direct light from various luminous bodies, such as the luminous bodies we see, such as televisions, mobile phones, light bulbs, the sun, etc.

The human eye is a naturally occurring biological organ, a photosensitive organ formed over billions of years by natural reflected light, and is therefore able to adapt to the natural reflected light environment.

Although the light source produced by the luminous materials of televisions, mobile phones, etc. is as close to natural light as possible, the light waves it emits are still active direct light waves with direct light radiation characteristics. Since the directivity of most direct radiation light is essentially different from that of diffuse reflection light, it can cause damage to human eyes.

Therefore, no matter what measures are taken, as long as the fundamental factors of direct radiation are not eliminated, all measures are "IQ taxes".