1. Not maintained for a long time

  As a correction tool that needs to be worn every day, glasses are exposed to the sun and rain. After a long time, even if the adjustment is in place before, there will be loose screws caused by frequent opening and closing of the temples, and nose pads caused by excessive accumulation of dust and grease Astringent etc.

  Therefore, it is recommended that parents develop the habit of regularly overhauling their children's glasses.

If the child's glasses are not maintained in time, it may lead to a decrease in wearing comfort over time, including the easy sliding of the frame and the change of the position of the nose pad. The performance on the face is: the glasses are crooked.

2. Problems with the glasses themselves

  Children's glasses are easy to crooked, and it may also be related to the material of the frame.

If the material of the selected frame itself is soft, the hardness is not strong, or there are technical problems, if the lens is thicker, or the stress after processing is relatively large due to the large difference in the prescription of the two glasses and the uneven thickness of the lenses on both sides. If it is large, it may have a reverse "shaping" effect on the frame.

3. The harm of wearing crooked glasses for a long time

  The power of the lens is not the same for every angle. So if the child's glasses are crooked, then there is a difference in the degree of seeing things at ordinary times.

  Some children who can adapt are fine, but those who cannot adapt will experience dizziness, headache, and nausea.

In addition, theoretically speaking, spectacle lenses not only have the standard of lens power, but also include: the distance between the rear vertex of the lens and the front of the cornea of the eye, the distance between the pupils of the eyes, the angle between the left and right lenses, and the angle between the lens and the vertical direction. 

  This series of parameters will change with the deformation of the frame. Take the eye distance as an example: the shorter the eye distance, the higher the lens power; the longer the eye distance, the lower the lens power.That is to say, if the child wears crooked glasses for a long time, the lenses will not be the prescription at all.This will lead to the deterioration of the vision correction effect of the glasses, and the degree of myopia will easily increase instead!