Keratoplasty is very hot recently, not only because it is the most effective way to control the growth of nearsightedness in teenagers, but also because keratoplasty is the only “magic weapon” for non-surgical rapid vision enhancement for college entrance exams, military conscription, and civil service medical checkups. Therefore, recently many people are inquiring, how many degrees of their own optometry is how many, can wear keratoplasty lenses? It is difficult for me to answer such a question. Keratoplasty technology is a more complex technology in the field of optometry, in the national professional standards for optometrists belongs to the highest occupational level of senior optometry technician requirements. Keratoplasty has certain restrictions on the conditions of the population, not everyone is suitable for keratoplasty. Strict screening of keratoplasty patients is an important responsibility of the doctor, and is the first step to successful fitting. The fitters should always keep in mind that those who do not meet the criteria should not be forced to wear keratoplasty lenses. The main candidates for keratoplasty (screening guidelines) are: Ocular: no eye diseases such as acute keratitis, glaucoma, corneal trauma, etc. No keratoconus surgery, etc. Intraocular pressure: intraocular pressure within the normal value – 10~21mmhg. Pupil size is normal, the pupil should not be too large (not more than 6mm) in dark light environment, otherwise it is easy to cause night glare. Systemic conditions: no immunocompromised diseases Personal conditions: good hygienic conditions, good hygienic habits, follow the doctor’s instructions, and have the ability to take care of themselves. Refractive conditions:Myopia reduction of 600 degrees or less, conformal astigmatism less than 175 degrees, contra-conventional astigmatism less than 75 degrees, ratio of myopia to astigmatism greater than 2, corneal flat K value less than 46D, difference between corneal flat K value and the desired reduction in myopia greater than 36D, and central corneal E value greater than 0.3. Despite the fact that we have done a lot of tests in the questioning and the general checkups, the initial examinations such as the optometric examination and so on, and have made an assessment of the Although we do a lot of tests in the consultation and general examination, optometry and other initial examinations to assess whether the user is suitable for fitting, there are still some factors that cannot be confirmed in the eye examination and must be confirmed by trial fitting. The most common in the actual fitting: first, the upper eyelid is too tight, resulting in upward deviation of the lens, which can not be centered; second, the corneal surface is irregular, the tension is not uniform, and although the lens tightness is very good, but it is always to the left or right and can not be centered. For these two types of patients, even though all the indicators in the initial examination are suitable for wearing keratoplasty lenses, they still have to give up the examination and fitting. As you can see, the fitting of keratoplasty lenses is a very important part of the fitting process. Some fitters customize lenses based on only a few parameters or corneal topography parameters and fail to take all factors into account. When such lenses are made to be worn by patients, a certain percentage of the population will have lenses that do not fit perfectly, resulting in safety issues. A fitting program that identifies lenses that prove to be a good fit after actual wear can greatly increase the success rate of the first fitting. It’s like customizing a dress; measurements are taken and then a fitting is done to make the best fit. To summarize: Therefore, it takes a process to determine whether a person is suitable for keratoplasty, and it is not something that can be determined by a simple consultation and examination. It takes more than a fitting process to determine this, and sometimes this process takes 2 or 3 days. Of course, although the process is complicated: consultation, examination, optometry, fitting …… But through such a strict screening, once the fit is judged suitable, then the fitting result will be very good, almost no complications, and the success rate is very high.