During the winter vacation, many animated films are released in this period, but most of them are 3D versions. After watching the big 3D screen for an hour or two, even the parents as adults will have such a feeling that their eyes are very tired. Many children even drop their 3D glasses and jump off their seats midway, saying “I’m dizzy!” So, what should we pay attention to at this time?
Can children watch 3D movies?
“3D is not recommended for primary and younger children.” Experts say so. Children’s vision is still in the development stage, and their adjustment ability is not as strong as that of adults. When they watch 3D effects, they are more likely to form eye fatigue. “For a long time, it has a great impact on the development of children’s eyesight. Long time eyestrain often leads to pseudomyopia. If pseudomyopia cannot be adjusted correctly, it will become true myopia as time goes by.”
Experts also pointed out that many parents now use iPads and iPhones as their children’s entertainment tools, which is also inappropriate. Long-term close eye use will cause eye fatigue and affect the normal development of vision.
How 3D movies work
When shooting 3D films, two cameras must be used to imitate the visual angle of human eyes. At the same time, two projectors are used to shoot and play at the same time. Therefore, when watching a 3D movie, the picture projected on the screen is actually made of two overlapping pictures, which is why when watching with naked eyes, the picture on the screen will be found to have a double shadow.
Why do you feel dizzy when watching 3D movies
3D glasses can separate the overlapped pictures by filtering the light of certain wavelength or specific color, so that your left and right eyes can see two pictures with different depth of field respectively, and then synthesize stereo images in the viewer’s brain. Because of the distance difference between the two pictures, the eyes need to constantly relax through the eye muscles to adjust the lens, which to some extent causes visual fatigue. When some people’s eye regulation fusion function is poor, they will have eye dryness, dizziness and even nausea and other uncomfortable reactions.
The generation of discomfort is also related to the sudden change of eye use habits. In fact, we also have stereo vision in our daily life. The information we receive is more complex than when we watch 3D movies, but we are not uncomfortable. This is because we are used to this way of using eyes. I have treated some cases. Some people who have myopia have recovered their normal vision through surgery. Instead, they often feel bloated temples and tired eyes for a period of time. This is a temporary discomfort caused by the sudden change of eye habits. The same is true for watching 3D movies.
In addition, when watching 3D movies, the audience is often attracted by the plot, highly focused, and the frequency of blinking is reduced. In some action movies, the screen often brings strong sensory stimulation to the audience. In this case, the audience is more prone to fatigue. (Li Haiyan, vice president of Shanghai New Vision ophthalmic hospital)
For most people, such symptoms of visual fatigue or discomfort can be recovered quickly and will not cause damage to the eyes. Because a movie is only about 2 hours long, the viewing time is acceptable. The premise, of course, is that the viewer does not have eye problems.
Notes on watching 3D movies
People who are uncomfortable watching 3D movies should try to choose the seats in the back row, which can reduce the fatigue of the eyes to a certain extent. Because when we are looking at different distant and near things, the ciliary muscle of the eye is constantly adjusted. The closer you look, the more your ciliary muscles contract, forcing the lens to expand, the closer your focus will be. Therefore, the closer the distance between eyes, the more fatigue the eyes are likely to produce. In addition, if it is glaucoma, high myopia, high intraocular pressure and other eye diseases, it is not recommended to watch 3D movies.
Of course, if people who watch 3D movies will have a strong sense of discomfort really want to watch a 3D movie, but they can’t find a 2D version, then 2D glasses can be used.
The principle of 3D glasses is that the left and right lenses respectively filter the light of different wavelengths or colors, so that the left and right eyes can see different pictures. Then 2D glasses go in the opposite direction. The left and right eyes filter out the light of the same wavelength or color, so that the two eyes can see the same picture. In this way, 3D becomes 2D in an instant, and the viewer will not feel dizzy or uncomfortable.
Therefore, children are prone to dizziness when watching 3D movies. It is very important to choose the back seat. Parents should not often take their children to watch 3D movies to avoid damaging their eyesight. Baibai safety net’s common sense about children’s home electric shock prevention is still being updated. Please continue to pay attention to this website!