Let's start with the answer: wear it.
If this happens, parents make intuitive judgments, and the results will be very bad.
Without understanding the principles of optometry, ask a random person: What is the purpose of wearing glasses?Nine out of ten people will say, "To see more clearly." ”
Most people are familiar with glasses. After graduating from high school, nearly 9** were nearsighted. If you can't see things clearly, you will naturally think that the degree of myopia has increased. Re-refraction, changed lenses, and it was clear again.
So, the intuition is that you need to wear glasses because you can't see clearly;If you wear glasses, it is not as clear as not wearing glasses, and you can wear it more clearly, if you wear glasses to see things more clearly, it must be that the glasses are not right!
Let's not discuss the processing errors of the glasses and the situation of the doctor Zhang Guan Li Dai, we will only talk about the situation that the mirror is correct and the processing is correct.
Why do farsighted and amblyopia children have lower visual acuity than the naked eye?
There is a professional term that you need to know about itResting to regulate tension
The accommodative function of the eye is to change the thickness and refractive power of the lens through relaxation and tension of the ciliary muscle in the eye, so as to achieve clear vision from far and near. For example, a 600-degree farsighted eye can become 100-degree hyperopia after the adjustment of the eye - at this time, the adjustment power of the eye is 500 degrees.
Even without a "work task", the ciliary muscle retains a certain amount of tension, which we call "resting tension".
Children with farsightedness need to use a lot of adjustment to see clearly when they are not equipped with glasses, so the resting adjustment tension of the eyes will be very high. In the long run, the child's eyes may have become Xi to this high-intensity state of adjustment.
To use a rubber band as an example: a new rubber band is just enough to tighten the wrist, and if you deliberately stretch the rubber band to the extreme overnight, and then put it on the wrist, it will loosen. The same is true of the "resting tension" of the eye, which can be changed – only that change takes time.
One of the functions of farsighted glasses is "compensatory adjustment". In other words, after wearing farsighted glasses, the eyes no longer need to be in such a high-intensity adjustment state to be able to image clearly. ButAfter too much "high-intensity tension adjustment", the ciliary muscle cannot relax all of a sudden, and the vision with glasses is lower than that of the naked eye.
Specifically, after wearing 500-degree farsighted glasses, the eye only needs to mobilize 100 degrees to adjust the tension to image clearlyAt this time, the eye still maintains a 500-degree adjustment tension, which in fact produces a 400-degree myopia state. Therefore, wearing glasses can not see clearly.
As long as you insist on wearing glasses strictly throughout the day, the adjustment tension will be reduced, and the eyesight of wearing glasses will gradually catch up.
The naked eye can see more clearly than wearing glasses, and there are other explanations in terms of accommodative esotropia and glasses compliance. You can read Yiming's other popular science works to understand.