Does privacy film really hurt your eyes?

A few days ago, a netizen said on Weibo that he had been using an anti-peep film for two or three months, and gradually found that there were dark shadows when he looked at everything, and he felt that he was "going blind."

How privacy films work

Privacy film is a mobile phone film that prevents others from peeping at the screen. The mobile phone user can see the screen content clearly in the vertical direction, while the people around can only see a black screen in the oblique direction. In this way, the user's privacy is protected.

The core technology of privacy film adopts ultra-fine blinds optical technology. We can observe different scenes at different angles through ordinary blinds. When people look out of the window from the front, they can see the whole picture; when people observe from the side, their sight is blocked by the blinds blades. The core principle of privacy film is to regularly reduce the distance between the blinds blades, and use the blinds layer with ultra-fine blades so that the light on the front side of the screen is only blocked by the narrowest area of ​​the blades, with the highest transmittance and the strongest visibility. As the angle tilts, the area of ​​light blocked by the blades becomes larger, the transmittance gradually decreases, and the screen gradually darkens.

Privacy film can reduce screen brightness

Many netizens who have used anti-peep films have reported that after applying the anti-peep film, the screen brightness will decrease, and the screen brightness needs to be brightened to achieve the original visual effect. This is because of the shutter structure in the anti-peep film, only part of the light emitted by the screen can be received by the eyes. Studies have shown that after the anti-peep structure is added to the mobile phone screen, the brightness is reduced by about 1/3.

Does the privacy film hurt your eyes?

There is no research on whether using privacy films can cause damage to the eyes, so the claim that privacy films can damage the eyes lacks evidence-based medical evidence. However, if the screen brightness is too low, the eyes will have a harder time seeing things, which may induce or aggravate visual fatigue; this effect will be more obvious when using the eyes for a long time. When people use electronic products for too long, they blink less frequently, which can easily lead to dry eyes, which also causes sore and tired eyes. Therefore, everyone should adjust the screen brightness according to their own situation and avoid using their eyes for a long time.

In addition, if the material of the anti-peep film is of poor quality, it may affect the resolution of the screen. It is recommended that you choose products from regular manufacturers when purchasing.