If myopia is found to be caused by a thickening of the lens after an examination, this condition is also known as refractive myopia. Because the lens becomes thicker, the refractive power of the eye becomes larger than normal, and parallel light rays, after passing through the refractive media of the eye, cannot fall on the surface of the retina, but fall in front of the retina, thus forming myopia, which is also a very common type of myopia. In this case, the need for glasses should be determined by the specific degree of myopia. If the degree of myopia is small, such as within 100 degrees, the situation does not need to be dealt with for the time being, and a reasonable eye habit can be maintained in general. However, if the degree of myopia is relatively large, resulting in a significant loss of vision, it is necessary to wear glasses early.