Corneal shaping lenses are lenses that can help correct vision. They are worn in front of the cornea at night before the patient goes to bed and change the geometry of the cornea through physical pressure, which in turn corrects vision. However, if patients do not use them properly, they may cause some harm to their bodies. The five major hazards of keratoplasty, common are corneal infection, poor oxygen permeability, central corneal thinning, corneal curvature deformation and lead to other eye diseases. 1, corneal infection: after wearing keratoplasty, if the patient’s hands are not clean, or corneal plastic lens with dust, bacteria, sometimes can lead to infection, so that patients feel eye discomfort. In addition, corneal epithelial damage can sometimes lead to corneal infection and even corneal scarring in severe cases; 2, poor oxygen permeability: because the keratoplasty lens is closely bound to the eye surface, its breathability and oxygen permeability is not as good as its own cornea. If worn overtime, patients may experience eye dryness, dry itch and other symptoms, and in severe cases, even dry eye disease. But patients do not have to worry too much, as long as the regular method of timely wear, pay attention to eye habits and sleep, generally will not cause dry eye; 3, corneal central thinning: the normal central thickness of the cornea is about 0.56mm, often wear keratomileusis patients, the central part of the cornea will have a mild thinning phenomenon, the main reminder of the cone cornea is not suitable for patients wearing keratomileusis; 4, corneal curvature Deformation: There is a certain connection with the central thinning of the cornea, as the central part of the cornea may be slightly thinner, the peripheral part of the cornea will appear higher, that is, the corneal curvature changes, deformation. But corneal morphology is reversible, if stop wearing 1 month or even longer, the cornea will return to the most original state; 5, other eye diseases: some patients wearing keratomileusis, if not according to the standard operation, there is the possibility of irregular astigmatism or some eye lesions.