The role of corneal contact lenses are mainly the following: 1, to avoid the impact of frame glasses imaging amplification or reduction, can allow patients better visual quality, the image seen more realistic; 2, for contact lenses in the hard high oxygen permeability contact lenses, in addition to the above-mentioned aspects of the advantages, there can also be corrected corneal irregularity advantage, such as suffering from cone cornea, corneal preconvexity, corneal variability is very large, or have done surgery, the trauma to the eye, the cornea has become very irregular. For patients with these diseases, it is difficult to improve vision with frame glasses, but if you use corneal contact lenses, you can make the irregular corneal front surface into a regular lens front surface, vision can be well improved; 3. Wearing keratoplasty lenses at night can be a brief treatment for myopia, and you can not wear frame glasses during the day, and the important advantage is that myopia can be delayed to some extent, so that patients do not develop myopia very quickly. Therefore, the advantages of corneal contact lenses are very large, to be applied in a clinical and rational manner, to give maximum advantage.