"Nezha 2" has exceeded 10 billion box office! These three types of people are not recommended to watch the 3D version

Review expert: Peng Guoqiu, deputy chief physician of the Fourth Medical Center of the General Hospital of the Chinese People's Liberation Army

The Spring Festival movie "Nezha" has a box office of over 10 billion yuan. Have you watched it? Did you watch it in 3D or 2D?

Nowadays, 3D movies are becoming more and more common on the big screen with their immersive visual experience. However, many people experience dizziness, nausea and other discomfort symptoms when watching 3D movies. Why is this? Who is not suitable for watching 3D movies? What are some ways to alleviate the discomfort of watching 3D movies?

What are 3D movies?

3D movies, also known as stereoscopic movies or three-dimensional movies, are a form of film that simulates the difference in binocular vision of the human eye to give the audience a sense of three-dimensionality while watching the movie.

The core principle is to use two cameras to shoot the same scene from different angles. During projection, two sets of films are projected synchronously through two projectors so that the two slightly different sets of images overlap on the screen.

If you watch the picture directly, you will see double images. However, when you wear special 3D glasses, the left and right images will overlap, creating a three-dimensional and realistic visual effect.

Why do I feel dizzy when watching 3D movies?

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The protest of the eyes

When watching 3D movies, in order to adapt to the constantly changing three-dimensional images, the eye muscles need to continuously adjust and focus, just like a spring that is always tight, which can easily cause fatigue over time. In addition, 3D movie images often have a strong visual impact, and the theater environment is also relatively dim. Under the combined effect of multiple factors, the eyes will experience dryness, soreness and other discomforts, which in turn cause dizziness and nausea.

In addition, if the 3D glasses are of poor quality, such as wear and tear, poor light transmittance, or if they are overlapped with your own myopia glasses, it will increase eye fatigue and cause discomfort symptoms such as headaches.

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Brain "confusion"

There is an important balance organ in our inner ear - the vestibular system, which is mainly responsible for sensing the position and movement of the head and helping us maintain body balance. When our brain processes the visual information of 3D movies, our eyes see a virtual world full of dynamics and three-dimensionality, while the vestibular system perceives that the body is in a static state.

It's like the eyes say "we are moving" but the vestibular system says "no". The two contradictory information are transmitted to the brain at the same time, making the brain "at a loss", which will cause dizziness, nausea and other discomfort symptoms.

These three types of people are not suitable for watching 3D movies 0 1

People with eye diseases

Patients with eye diseases such as strabismus, dry eyes, glaucoma, conjunctivitis, pink eye, and severe astigmatism have certain problems with their eye visual function. Watching 3D movies will further increase the burden on the eyes, causing increased discomfort and even irreversible damage.

In addition, people with myopia, hyperopia, and astigmatism need to wear corrective glasses. When the difference in the degree of the two eyes exceeds 250 degrees, they need to wear contact lenses to reduce the difference in imaging between the two eyes.

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Patients with nervous system and cardiovascular diseases

When patients with high blood pressure or heart disease watch 3D movies, the sound and light stimulation and tense plot may cause high blood pressure, chest tightness and other discomfort. People with vertigo, fear of heights and motion sickness are prone to dizziness, nausea and even vomiting when watching 3D images such as flying and rotating.

Patients with mental illnesses (such as depression and mania) may have their mental symptoms aggravated by sensory stimulation.

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Children and the elderly

Children's visual and vestibular systems are not yet fully developed. The strong stimulation of 3D images may interfere with their normal visual development and even cause problems such as myopia and strabismus.

The visual and vestibular system functions of the elderly gradually decline, and their body tolerance and adjustment abilities are not as good as those of young people. They are more likely to experience headaches, dizziness, nausea and other discomfort symptoms when watching 3D movies.

What methods can relieve discomfort?

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Preferred rear position

When watching 3D movies, you can try to choose a seat that is farther back, usually 6-8 rows away from the screen, as this area has a good field of view and can reduce the burden on your eyes. At the same time, pay attention to adjusting the seat angle when watching a movie so that your eyes can naturally look at the screen horizontally, which can avoid excessive fatigue of the neck and eyes.

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Take a break

While watching a movie, remember to take breaks at appropriate times. You can consciously blink every once in a while to relax your eye muscles, or take off your 3D glasses and close your eyes to rest for a while to free your eyes from the tense state of watching the movie.

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Stop if you feel uncomfortable and check promptly

If you feel very uncomfortable while watching a movie, you should stop watching it immediately. Especially for those who experience eye discomfort, dizziness, nausea, vomiting, etc. every time they watch a 3D movie, they should be more vigilant and go to the hospital's ophthalmology department for a detailed examination to check if there is any abnormality in their eyes.