What is the essential difference between RGP (rigid corneal contact lenses) and keratoplasty lenses? RGP and keratoplasty lenses are both high oxygen permeable rigid contact lenses, both have the function of correcting refractive errors, while keratoplasty lenses can promote rapid and reasonable deformation of the cornea and reduce part of the refractive error, mainly used in the control and treatment of myopia in youth; RGP is mostly used in the correction of myopia, astigmatism and other refractive errors, according to research results, RGP can also have certain effect on myopia control when used properly.