Proper selection and centering of an intraocular lens (IOL) is provided. An image of an eye, which may be captured during pre-operative tests and provided to a program operable to calculate the power and axis orientation of the IOL, is used to determine the location and orientation of the IOL. This produces an output or placement guide used to properly center and orient an IOL within the eye.本發明提供一人工水晶體(IOL)之妥當選擇及定心。利用可在術前測試被擷取且提供至一可操作以計算IOL的焦度及軸線定向之程式之一眼睛的一影像來決定IOL的區位及定向。這產生用來將一IOL妥當地定心及定向在眼睛內之一輸出或置放導件。
