The main difference between 1.61 and 1.67 refractive index lenses for myopia is the thickness of the lenses.
The refractive index of the lens is different due to the difference in the material, the higher the refractive index, the thinner and lighter the lens is, the thinner and lighter the 1.67 refractive index lens is compared to the 1.61 refractive index lens, these two refractive index lenses are commonly used at the moment.
However, the higher the refractive index of the lens, the more expensive the lens will be, as lenses with a higher refractive index are usually lighter in weight and more comfortable for the patient to wear.
Nearsighted patients are advised to visit the hospital in a timely manner to have their condition evaluated and to choose the appropriate treatment under the guidance of their doctor.