Before fitting: 1.You must understand that rigid oxygen permeable corneal contact lenses are highly consumable medical optical products, long-term wearers need to pay for the renewal or damage of the lenses, the consumption of care packages and review and evaluation; 2.You must understand that not every wearer can be guaranteed to achieve the desired degree of corrective effect. You must be able to complete the entire orthodontic process under the guidance of the fitter; 2. You must ensure that you can contact the fitter in time for any situation that arises during the orthodontic process; 3. You must understand the problems that may arise during the orthodontic process and be able to accept and actively cooperate; 4. You must clearly understand the importance of review and be able to actively review as required.