The authors have developed a computer program that can be of valuable assistance in surgical decision-making for strabismus surgery. The combination of diagnostic data of individual surgical cases, related diagnosis and treatments are incorporated into a well designed, clinically applicable software system. A new way of interactive, virtual eye muscle surgery and preoperative planning is proposed, based on a biomechanical model of the human eye, which enables the prediction of surgical outcomes on the basis of objective, anatomically related and measured data. Additionally, a realistic three-dimensional visualization of the human eyes and their muscles is used to support detailed evaluation and meaningful interpretation of eye motility disorders. This software system is not intended to replace common clinical diagnostics, nor surgical expertise but it should improve the accuracy of clinical decisions in an objective manner.