People who have been underground for a long time, why can t they see the light immediately?

Because people who are under the ground can't see the light, they are used to the darkness, and if you see the light as soon as you come up, your eyes may be pierced by the light, so you have to adapt slowly and don't open your eyes all at once.

Because there is no light underground, people who have been staying for a long time have adapted to the lightless environment, and if they see the light immediately, they may be blinded because the light is too bright.

Because the underground is an environment where the optical fiber is very weak or even there is no light, the human eye will adapt to the environment, and once the light is suddenly seen, a large amount of light will rush into the human eye, which will seriously lead to blindness.

<> "From the dark to the bright or from the bright to the dark, the two types of visual cells need to change their positions and change responsibilities, so the human eye needs to have time to adapt. If there is a sudden alternation of light and darkness, and the eyes do not have time to adjust, the person will feel uncomfortable, and it may cause damage to the eyes. That's why coal miners are blindfolded when they come out of underground coal holes, and they are also blindfolded when rescuers carry the injured out.

What's more, people will seriously lack the synthesis of calcium in a house without sunlight for a long time, especially in winter.

It is more suitable for the human body to convert the calcium rate. Once a person is deficient in calcium, it is not just osteoporosis.

There will be a lot of inconvenience in daily life, and if you are not careful, the chance of disability will increase. People have to live in hope, from childhood to adulthood, they always live in their own hopes and dreams, running in the place that leads to success and dreams; When people get old, they may not be able to run. At this time, people often give their dreams and hopes to their sons and grandchildren, and let them run with their hopes.

Therefore, it is definitely not hopeless when people get old.

Living in such a dark building, it can be imagined that the mood is also very depressed after a long time, and my friends come to my house as guests, and they have repeatedly said how can they live in such a building, and when I come in, I feel very depressed, and if I feel very uncomfortable in all parts of my body after a long time.

Plants need photosynthesis.

People are also indispensable to rain, dew and sunshine. People's yin and yang need to be relatively balanced, the body is healthy, if the body is left in an environment without sun nourishment for a long time, the yin is cold, damp and cold, the blood and qi do not lose cloth, do not nourish, for a long time the yang qi has no base, and it is difficult to rise, which will cause the sickness of qi and blood deficiency, and then affect people's diet and daily life, do you think so? And every organ is interconnected, and as long as one is affected, the others will be affected.

If it continues, the physical condition will deteriorate, and staying in a house without sunlight for a long time will definitely be bad for the body, which will reduce resistance, be prone to calcium deficiency, affect eyesight, etc., and everyone should bask in the sun more in life.

Because the human eye needs a time to adapt to the light, rash contact with strong light will cause damage to the eye. So people who have just come out of the basement need to slow down for a while before opening their eyes.