Ortho-K, It is the cornea that we often say model lens, the inside surface has a lot of arc section, when wearing, can pass pressure to reshape cornea shape, prevent myopia development thereby. They are often confused because they are similar in appearance to regular contact lenses and are in direct contact with the eye. But in reality, the Ortho-K is very different from regular contact lenses. Wearing time is different. Ortho-K belong to the type of night wear, wear at night before going to bed, the next morning to take off, during the day can no longer need to wear any glasses to achieve the effect of vision improvement. And common contact lens is worn in the daytime, only when wearing ability has correctional effect, and must control to wear time, avoid the influence of wind sand, dust even.
Oxygen permeability is different. Ortho-K needs to be worn when sleeping, so it is made of a kind of fluorosilicon with high oxygen permeability, which can meet the oxygen demand of the cornea. However, the oxygen permeability of ordinary contact lenses varies greatly according to their respective materials, which can easily lead to corneal hypoxia and lead to inflammation. The operation is different. Ortho-K before wearing, to drop in the lens full of runye, so after wearing the lens and the eyes between a layer of liquid, easy to tear circulation, will not form direct wear to the cornea. While ordinary contact lenses are worn directly on the cornea, it is easy to rub the corneal cells after the evaporation of water.
Through the comparison, it can be seen that the difference between Ortho-K and ordinary contact lens is relatively obvious. So, if you want to control the increase in strength, you should choose Ortho-K, and if you want to wear elastic demand or want to beautify the pupils, you can wear contact lenses. But be careful, no matter which kind of corneal contact lens you choose, you should pay attention to hygiene and cleanliness to prevent the occurrence of eye diseases.