It is very common for people with myopia to wear children's eyeglasses that are lower than their true degree. In daily outpatient clinics, parents wear their children for optometry, and the true degree is verified. The next day when I came to fix my glasses, many parents said, "If you give my child a lower degree, they will wear them higher and higher.".

Let's first talk about the origin of this approach! In the research on the causes of myopia in the last century, some animal models of myopia were made.

In the model, it was found that hyperopia defocus in the center of the retina can lead to the formation of myopia (during the process of using the eye at close range, there is a hyperopia defocus at the beginning, and the image only falls onto the retina after the lens completes adjustment, but this time difference is calculated in milliseconds, which normal people cannot feel. Some abnormal adjustments can be felt).

Moreover, providing the central retina of these myopic animals with a myopic defocus (which is equivalent to wearing low-degree myopia discount prescription glasses) has been found to have an inhibitory effect on the development of myopia.

Therefore, at that time, some ophthalmologists and optometrists were accustomed to low correction when prescribing glasses.

There are two reasons: firstly, being afraid of being too high can cause hyperopia and defocus, leading to accelerated development of myopia. Secondly, it has been found in animal models that myopic defocusing has an inhibitory effect on the development of myopia, with the hope that it will also be effective in humans.

In addition to wearing low-degree myopia discount prescription glasses, many similar methods have also emerged. For example, there are two pairs of glasses, one for hiking correction and the other for close-up correction.