The alignment diagram, also known as nomogram, is a statistical prediction model used to predict the risk of events(such as diagnosis or prediction of disease development and consequences)by obtaining the influence power of each related factor on outcome variables through multivariate analysis. Nomogram turns the complex regression equation to a visualized diagram that is intuitive and easy to understand. It is convenient to be used for evaluating the patient's condition and communicating with doctors and patients. With rapid advances of medical science and technology and increasing demands of personalized medicine, nomograms has attracted more and more attention and applied extensively in clinical medicine. This short article introduces the basic concepts of nomogram and examples of its application in ophthalmology.