An orthokeratology lens designating system 10 includes a selecting device 20, a database server 30, a lens designating server 50 and a terminal device 70. The selecting device 20 includes a device 22 for acquiring movement data of an orthokeratology lens moving on a cornea with the orthokeratology lens mounted on the cornea, and an assessing device 28 for assessing, on the basis of the lens movement data, that the orthokeratology lens is a registered lens that can be used for a patient. Registered lens correction D data of the registered lens, registered patient data including registered cornea D data of a cornea, and registration stage data that indicates in which stage of a plurality of correction stages, the lens is to be mounted on the cornea, are output to the database server 30. The database server 30 is configured to accept and store these pieces of data to build a database. The terminal device 70 includes a patient data acquiring device 71 and a patient stage data accepting means, and is capable of transmitting patient data and patient stage data to the lens designating server 50. The lens designating server 50 is configured to retrieve from the database a registered lens having registered data that are the same as or close to the received patient data and patient stage data, and to designate the retrieved registered lens as the orthokeratology lens to be used for the patient.角膜塑型鏡片決定系統(10)係構成為：具有：選定裝置(20)、資料庫伺服器(30)、鏡片決定伺服器(50)、終端機裝置(70)而成，選定裝置(20)係包含：裝戴在角膜的角膜塑型鏡片的角膜上的鏡片移動資料的取得裝置(22)；及由鏡片移動資料判定為可使用在患者的登錄鏡片的判定裝置(28)而成，將登錄鏡片的登錄鏡片矯正D資料、包含角膜的登錄角膜D資料的登錄患者資料、及表示為在複數矯正階段中的第幾個階級被裝戴在角膜的鏡片的登錄階級資料，輸出至資料庫伺服器(30)，資料庫伺服器(30)係受理該等資料且記憶來建構資料庫，終端機裝置(70)係包含：患者資料取得裝置(71)、患者階級資料受理手段，而且，可將患者資料、患者階級資料送訊至鏡片決定伺服器(50)，鏡片決定伺服器(50)係由資料庫檢測具有與所接收到的患者資料、患者階級資料為相同或接近此的登錄資料的登錄鏡片，決定作為使用在患者的角膜塑型鏡片。
