Do blue light phone films really work?

With the rapid development of society, smartphones have become an indispensable part of people's daily lives. However, everything has two sides. While smartphones bring many conveniences to our lives, they will also cause certain harm to our bodies. Especially the blue light produced by mobile phones. Due to long-term use of mobile phones, people's eyes do not get enough rest and are stimulated by blue light, so people's eyesight is declining more and more seriously. Therefore, anti-blue light mobile phone films have been launched. Many people think that this will be an essential tool to save eyesight, but in fact, anti-blue light mobile phone films can only block some light stimulation to a certain extent and cannot fundamentally help people restore their eyesight.

1. What’s wrong with Blu-ray?

Blue light refers to electromagnetic waves with a wavelength of 400 to 500 nanometers. Due to its shorter wavelength, blue light has higher energy and stronger penetrating power. Therefore, blue light has the ability to penetrate the cornea and lens, causing certain damage to the retina at the fundus.

The light sources of most of the mobile phones we use daily are LEDs. The most coincidental thing is that LED light sources are mainly blue light. If you want to increase the brightness, the intensity of blue light will also increase. In recent years, the brightness of mobile phone screens has also been increasing, so blue light is indeed becoming a greater threat to our eyes.

2. Is it necessary to block blue light?

However, when talking about the hazards of blue light, don't forget that there are two important indicators: exposure brightness and exposure time.

In 2014, the Vision Health Laboratory of the China National Institute of Standardization and Wenzhou Medical University conducted a blue light retinal damage experiment. They used blue light with an illumination of more than 1500 lx to continuously irradiate retinal cells for 3 hours, causing the retinal cells to show decreased vitality and apoptosis.

However, the illumination of our daily LED lighting generally does not exceed 600 lx, and the illumination of mobile phone screens is even lower than this level.

So there is no need to protect against blue light? That’s not the case. For people who use mobile phones for a long time, blue light will still cause visual fatigue, and long-term excessive use of the eyes is not good.

But compared to putting anti-blue light films on your phone, Qiuzhen Laboratory still recommends that you take a more reasonable approach to reduce the damage of blue light to your eyes, which is to get more rest and use your eyes moderately. Every 20 minutes of continuous use of the phone, it is best to look into the distance for more than 20 seconds to relax your eyes.

3. Is anti-blue light film useful?

Although we don't need to be afraid of blue light, I believe everyone also wants to know whether anti-blue light mobile phone film is useful. Here, Qiuzhen Laboratory will tell you a cruel fact: anti-blue light mobile phone film is really useless.

We specifically consulted staff from an authoritative third-party laboratory, who had tested some anti-blue light tempered films on the market. The result is that these films have little effect on filtering blue light, and are about the same as films without blue light protection.

4. It is not feasible to block blue light by applying a film

Not only can anti-blue light films fail to effectively filter blue light, they can also cause the screen to become discolored and darker, which is not worth the effort.

In summary, blue light is indeed harmful to our eyes, but anti-blue light film cannot filter out blue light.

Not only when using mobile phones, but also when we use computers or watch TV for a long time, we should also use our eyes moderately and look into the distance for a while every 20 minutes to give our eyes sufficient rest. In addition, turning on night mode on your phone or computer, or purchasing blue light blocking glasses are also feasible preventive measures.

5. Why not try night mode?

Blue light cannot be blamed entirely for visual fatigue and vision impairment. In daily life, we should learn to use our eyes reasonably and moderately. This is the best way to prevent blue light and protect eyesight.