It is recommended to pay attention to the changes of children's vision and diopter. Children generally have mild hyperopia, which can protect children from myopia. The adjustment function of children's eyes is very good, and mild hyperopia can be compensated by adjustment. Of course, the child's hyperopia is definitely problematic, which requires glasses correction and visual training. If the child is nearsighted, no vision training will be conducted.
Extended data:
Protect eyesight
Generally speaking, when human eyes look at things with different distances and brightness, they have certain adjustment ability to make the image irradiated on the retina as clear as possible.
However, excessive use of eyes will increase the pressure of extraocular muscles on the eyeball, especially for primary and secondary school students, whose eyeballs are in the development stage and the ball wall is relatively extensive. Excessive use of eyes for a long time is more likely to cause abnormal eyeball development, resulting in refraction of distant light passing through the eyes, and the focus deviates from the retina, resulting in decreased vision. So, how to avoid this kind of overuse of eyes?
Proper brightness of light
Poor light brightness (too bright or too dark), especially in the study, work and life with high eye intensity, is the first factor affecting vision. To this end, the state has set strict standards for indoor illumination requirements on different occasions? (e.g. lighting for reading/writing in research >; 300Lux), but for ordinary people, this is not so direct to protect their eyesight.
The reason is that ordinary people don't have so much knowledge about the illumination (brightness) of ambient light, and the measurement of illumination requires eye-protection light pens or special lighting equipment. Therefore, it is not easy for ordinary people to judge whether the light is appropriate in their daily study, life and work.
Usually, there are three main situations of poor light: first, the environment itself is not suitable for light (such as too bright or too dark); Second, because the body posture (such as sitting posture or head posture) blocks the light incorrectly, the originally suitable light darkens when it hits the target area; Third, the light will change (for example, the sunlight in the morning and evening, the natural light on cloudy days or rainy days, and the position or illumination angle of the desk lamp will change).
Usually, these situations must be avoided to ensure that the light in the target area is bright and soft, so that the eyes are always relaxed. If you can't judge whether the brightness of the light in the study/workplace is appropriate, you'd better do some tests with an eye-protection photometric pen.
Good posture of closing eyes
Close eye posture is another factor that affects the incidence of myopia. Bad habits such as riding in a car, lying in bed and reading at a desk will increase the frequency and range of eye adjustment and should be avoided as far as possible.
When using eyes at close range, it is best to rest, sit up straight, and put books about 30cm away from your eyes. If you are watching TV, the distance from the TV is more than 6 times the diagonal of the TV.
Shorten the time of using eyes at close range
In addition to pathological factors, most students' vision decline is the decline of eye mediation function. Using eyes at close range for a long time under the condition of poor ambient light is more likely to lead to the decline of eye accommodation function, which in turn leads to the decline of vision, and should be avoided as far as possible. When using eyes at close range, rest every 45 ~ 60 minutes 10 ~ 15 minutes.
Increase outdoor activities
Doing more outdoor activities/exercises will not only promote blood circulation in the eyes, but also help to relax the muscles/nerves in the eyes, which is self-evident for protecting eyesight.
conclusion
Doing the above points in life helps to protect your eyesight. However, in the event of decreased vision (such as myopia), we should check it as soon as possible, analyze the reasons and make efforts to correct it, instead of rushing to get glasses and blindly trying various "fast" therapeutic devices, otherwise it will delay the opportunity to restore vision. Only by finding and eliminating the causes of decreased vision can we really protect our vision.
Wrong approach
Mistake 1: The eye drops are dry.
Because they spend too much time in front of the computer, some people are used to bringing a bottle of eye drops every day. They think that when their eyes are dry, they drop a drop, thinking that this is to protect their eyes. But ophthalmologists pointed out that this is actually bad for the eyes, and general drugs have side effects. It is ok to use eye drops occasionally when eyes are dry, but long-term use will have side effects and damage corneal epithelium.
Eye rest should be carried out by relaxing the eyes as much as possible, such as 15 minute window overlooking, or doing exercise to promote blood circulation and relax eye muscles.
Mistake 2: Turn off the lights and watch TV.
Some people usually like to turn off all the lights in the room when watching TV or using the computer, leaving only the light from the screen. Experts pointed out that this is wrong. At this time, the light contrast will be particularly high, and the eyes will be particularly tired. After a long time, it will affect your vision and even damage your eyes. It is reasonable to leave a little light (background light) indoors, not too dark.
Mistake 3: concentrate on using the computer without blinking.
Some people stare at the computer for so long that they don't blink. Experts pointed out that such eyes are easy to dry, and after a long time, they will have foreign body sensation, tears and even blurred vision. Blinking is actually a way for eyes to prevent corneal dryness, so adults must pay attention to 1 ~ 2 hours of rest when working on the computer, and often close their eyes to get a break.
Normal people aged 20-40 blink about 20 times per minute, but when they open their eyes and stare at the rapidly changing computer screen, the number of blinks will be reduced to 4-5 times per minute, resulting in a serious lack of tear secretion, which will lead to dry and sour eyes. Therefore, intentional blinking is very effective for eye protection.
Doctors suggest blinking at least 10 times per minute, which not only helps to promote the secretion of tears and relieve the symptoms of dryness and acidity, but also cleans the eyes and gives a small massage to relieve eye fatigue. In addition, washing eyes with hot water, hot towel or steam can promote blood circulation of eyes and reduce eye fatigue.
References:
Baidu encyclopedia-vision