The invention belongs to the technical field of optical display and relates to a visual optical 
system parallax calculation algorithm. The 
algorithm is mainly composed of an interactive interface setting module, a computational mesh module, a light trace direction judging module, a 
parallax calculation convergence speed control module, a 
parallax calculation precision control module, a data induction and analysis module, a graphical output module and so on, wherein the 
ray tracing direction judging module determines the 
ray tracing direction according to the 
trial and error method, then, according to the distance between the target point and the starting point, the convergence speed of the single calculation is determined by the parallax convergence speed control module. Through many iterative calculations, the tracking point gradually approaches to the target point, and finally the target point is determined by the parallax precision control module. As a visual optical 
system parallaxcalculation 
algorithm, that invention can realize one-key 
simulation analysis and graphic output of all field parallax in the entire 
pupil exit range of the visual optical 
system, has high parallax calculation efficiency and adjustable calculation precision, and provides an efficient and high-precision 
simulation analysis method for real-time calculation of the visual optical system parallax.