Generally speaking, the higher the myopia level, the thicker the lenses of the glasses will be. The thickness of myopic lenses is usually related to two factors, on the one hand, it is related to the prescription of the eye, the higher the prescription of the eye, the thicker the myopic lenses will be. On the other hand, it is related to the refractive index of the material used for the eye lenses. The higher the refractive index of the lenses with the same degree of prescription, the thinner the glasses will be. Myopia can be categorized into mild myopia, moderate myopia, and high myopia according to the degree of myopia, and patients with myopia above 600 degrees are called high myopia. If the degree of myopia is too high, even if the refractive index of the eyeglass lens is high, there will be some thickness, which is not only unattractive but also increases the weight of the lens. Ultra-thin lenses currently refers to lenses made of high refractive index materials, the advantage is lighter, thinner, more comfortable, especially for patients with high myopia, due to the refractive index is too high appears to be too many circles of spectacle lenses, the periphery is too thick, as the bottom of the bottle, the appearance is very unattractive, so try to choose the refractive index of the ultra-thin lenses, the thinner the lens, the weight of the glasses will be reduced accordingly, which will reduce the pressure on the nose. The thinner the lens, the weight of the glasses will be reduced accordingly, which can reduce the pressure on the nose.