Nearsightedness glasses 1.61 and 1.67 mainly refers to the refractive index, the difference between the two is that the refractive index is not the same, generally the higher the refractive index, the thinner the lens.
The refractive index of myopia lenses is different due to different materials, and the refractive index directly affects the thickness of the lenses, so the refractive index of the lenses will be indicated on the packaging of the lenses.1.61 and 1.67 are common refractive indices, and generally the higher the refractive index, the thinner the lenses.
The higher the refractive index, the thinner the lens. If a lens with a high refractive index is used, the glasses will have a better appearance and will be lighter in weight, making them more comfortable to wear.
Nearsighted patients are advised to visit the hospital in time to assess their condition and choose the appropriate treatment under the doctor’s guidance.