1, the difference in design and processing equipment: European and American races eye characteristics are different from Asians, and there will be some differences in the design of different brands.
2, the price difference: The price of keratoconus lenses is usually around 10,000 yuan, which is more cost-effective compared with the national brands.
3, the difference in lens customization cycle: All keratoconus lenses are custom-made, and because of the difference in the place of production, the time to get the lenses is not the same. Foreign lenses during an epidemic usually require a wait of about 1 month to 40 days.
Design
Keratoconus is a special type of RGP lens. While regular RGP lenses are used to correct vision, toric lenses are used for "orthopedic" purposes, i.e., to improve vision by changing the shape of the corneal collection. The inner surface of the "corrective" RGP lens is parallel to the surface of the cornea and coincides with each other, and the lens luminosity is adjusted by changing the outer surface of the lens.
The opposite is true for "orthopedic" lenses. The outer surface is simpler and the inner surface is more complex. Instead of being parallel to the cornea or matching the cornea, the inner surface of the plastic lens creates a gap between the lenses and the cornea, which is used to achieve the "orthopedic" effect by utilizing tear fluid.