The program Perisim 2000 enables one to simulate the interaction of a number of visual field examination strategies with a number of stored visual fields, both normal and pathological, with several patterns of observer (patient) behavior. A considerable number of visual fields, patient behavior patterns and examination strategies, including a full bracketing strategy, Gonzalez de la Rosa's tendency-oriented perimetry (TOP) and Weber's dynamic program, are available. Statistical programs are also incorporated. While the examination strategies to be used in the simulations must be selected from a predefined list, new visual field and observer patterns may be defined by the user. The results may be shown as numerical tables, symbolic or gray tone, pseudocolor or profile displays. Cumulative defect curves may also be selected. The learning/teaching benefits of the program Perisim 2000 are considerable. It is easy to understand and to operate, and ample explanations are available at each step of the program.