How should kids' eyeglasses online be matched specifically? The purpose of wearing glasses is to provide extra points for myopia prevention and control and to reduce axial growth rate. Improve visual function and have a clearer view of objects.
The types of glasses are divided into OK lenses, peripheral defocus lenses, and regular single-lens lenses for myopia; Glasses that are not nearsighted include low-degree convex lenses and flat peripheral defocusing lenses.
When not nearsighted, the eyeball is approximately spherical. After nearsightedness occurs, the growth rate of the anterior-posterior diameter is greater than that of the horizontal and vertical diameters, resulting in a conical ellipsoid state.
Ordinary children's eyeglasses still approximate spherical imaging, so the periphery will be imaged behind the retina. Imaging lag is the reason for the development of myopia, so ordinary single lenses do not have myopia prevention and control effects. A single lens is suitable for young children and amblyopia. Strabismus and large astigmatism.
Peripheral myopic defocus lenses, abbreviated as functional lenses, have a normal lens in the center and multiple small positive lenses around them. It can create advanced imaging in the surrounding area, thereby achieving the effect of myopia prevention and control. The eyeglass mart for this type of functional glasses is developing rapidly, with numerous brands to choose from.
Corneal reshaping lenses, also known as OK lenses, are similar in principle to peripheral myopia defocus lenses. By wearing them at night, a defocus ring is formed on the cornea, which can last for a day, and then continue to be worn at night, repeating the process. It can help children remove glasses during the day, combining prevention and correction.
