A large difference in prescription between two eyes, also known as refractive error, is a relatively common eye condition. In this case, in order to maintain the same visual effect in both eyes, it is recommended to consider wearing corneal contact lenses. In this case, it is possible to improve the visual image difference between the two eyes caused by the frames, because the image formed by corneal contact lenses is relatively equal in size. In the case of adults, surgical treatment is more effective because it can change the refractive state of the eyes more precisely and make the two eyes as uniform as possible. Common surgical procedures, including excimer laser surgery, femtosecond laser surgery, or intraocular refractive surgery, all of which can make the two eye prescriptions identical, are available.