What is the base curve of a contact lens? _Contact lenses_

When buying contact lenses, you should also know that each pair of glasses has different parameters. There are a large number of parameters, and each one has its own parameters. So if we really want to buy suitable contact lenses, then Certainly still have to consider the situation of the concrete parameter. And we often see the parameters of the base arc, so what is the base arc? How to choose the base curve of contact lenses? What does base mean? The base curve is actually the radius of curvature of the lens. The contact lenses we get have a certain degree of curvature, so that they can be worn comfortably. If the base arc is relatively large, the inner surface of the lens will be flatter. Because everyone's eyeball base curve is different, when we buy contact lenses, we must pay special attention to the condition of the base curve. If the base curve of the lens is larger than the base curve of the eyeball, there will be a slippage, and there is no way to deal with this situation. How to choose a suitable base arc? After all, the base arc of each contact lens is different, so it is recommended to choose a suitable base arc according to your actual situation. Of course, it is impossible for our own eyeball base curve to be exactly the same as the lens base curve, but in general, as long as we choose the contact lens base curve and the eyeball base curve to be controlled within 0.2MM, it will not affect the wearing effect. Therefore, you must pay attention to your eyeball base curve, so that you can choose the right contact lens. When choosing the base curve of a contact lens, you must pay special attention to the condition of loosening rather than tightening. In fact, when we wear contact lenses, we can look up by ourselves, and then simply push our lower eyelids with our hands. If it slides directly, then it proves that the contact lens is relatively loose, and if it does not move at all, it is The base arc is very tight. Most people's eyeball base curve is between 8.4-8.6, so if you don't know how to choose, you can also choose the basic contact lens type.