The correct name of corneal topography is corneal topography, which can correctly reflect the entire morphological changes of the corneal surface, which can clarify the diagnosis of corneal diseases, monitor the changes of the cornea after ocular surgery, and the choice of program for corneal refractive surgery, etc. 1. Define the diagnosis of corneal diseases: it can diagnose and guide the treatment of corneal bulging diseases, such as suspected conical cornea, early conical cornea diagnosis and treatment. 2. Monitor the changes of cornea before and after eye surgery: e.g. keratoplasty, pterygium excision, etc., which helps to observe the efficacy and improve the surgery. 3. Guiding treatment: such as the selection of corneal refractive surgery plan, control of surgical volume and observation of postoperative refractive error, such as individualized laser excimer cutting. It is recommended that patients with eye diseases should seek early medical treatment under the guidance of specialized physicians.