Does dim light really cause myopia

Does dim light really cause myopia? I believe that many people are paying attention to this problem, especially those with children at home, who will encounter these problems more or less in students and life, but don't worry, Sunmory will tell you what truly it is?

If you read a book under dim light or read a novel with a flashlight while hiding under the covers after turning off the lights, your parents may warn you that doing so will damage your eyesight. A quick search on the Internet, you will find that this is fabricated. And when you keep track of it and see if there is any relevant evidence, things become more complicated.

Our eyes are very cleverly designed to help us adapt to different lighting. When the light is weak, our pupils will expand to allow more light to gather on the retina, so that we can see more clearly. If you just wake up in a dark room, at first it is pitch black before your eyes, but after a while, you will be able to see more clearly, this is why your pupils have adapted to the darkness. At this moment, if the light is suddenly turned on, you will feel that the light is dazzling, and you cannot suddenly adapt to the light in front of you. You must wait for your pupils to adapt to the new light environment again to see the world in front of you again.

When reading a book under dim light, the process that takes place is no different from the previous one. Although the light is dim, your pupils will adjust themselves according to the surrounding light environment. The diameter of a human pupil is about 1.5 mm in strong light, and it expands to about 8 mm in dim light. But myopia is the fact that distant objects cannot converge in the retina, causing distant objects to be blurred. This is caused by the atrophy of the adjustment ability of the lens of the eye and has nothing to do with the adjustment of the pupil under dim light.

The misunderstanding that "reading in dim light can easily lead to myopia" may be related to life experience. When people are reading in a dim environment, they are prone to fatigue due to constant tension in their eyes, which makes people think that myopia is related to dim light. The above symptoms are not long-lasting and can be recovered after a short rest, so they will not affect the vision of the eyes.

The main factors that cause myopia

The primary factor affecting the vision of the eye is still genetic. There is a lot of evidence that genes inherited from parents are the main cause of myopia. If all parents are short-sighted, then the child has a 40% chance of getting myopia. On the contrary, if parents have good eyesight, the chance of their children suffering from myopia will drop to 10%.

Of course, many acquired factors have an impact on myopia. A study in the United Kingdom found that smoking and drinking during pregnancy and the baby's low birth weight will all have an impact on vision. Besides, it is well known that reading for a long time makes the eyes overloaded, and the lens muscles of the eyes are in a state of tension for a long time without rest. Over time, when looking at the distance, the muscles of the eyes cannot relax and are in a state of spasm. I feel fuzzy and form myopia.

A Sydney study investigated the conditions of more than 1,700 children living in Australia from 6 to 12 years old and found that the longer children spent outdoors, the less likely they were to develop myopia. Another outdoor survey also showed the protective effect of outdoor activities on the eyes, especially in East Asia where the myopia rate is relatively high, the effect is more obvious.

So, why does Nikko help this? There is a saying that playing sports allows children to focus on distant objects. However, the researchers pointed out that outdoor activities more affected the depth of the children's field of view and the ability to focus, some researchers even believe that exposure to sunlight can promote the production of dopamine, which can promote eye development.

It doesn't matter what children do outdoors. As long as they spend long enough outdoors, the children's learning and reading time is reduced. This is another kind of protection for them.

The above is part of what Sunmory understands. I hope it will be helpful to everyone. There will be more insights and updates in the follow-up. If you have more in-depth discussions and opinions, please leave a message or contact SUNMORY!