1. A method for automatic analysis of a retinal image implemented in a medical system with one or more processors, said method comprising: (a) automatically locating an optical disk on said retinal image and establishing a plurality of circumferences; (b) automatically detecting a plurality of vessels within a region defined by said circumferences' radii using a crease-based algorithm; (c) automatically extracting a plurality of vessel segments based on a deformable models algorithm; and (d) automatically classifying said plurality of vessel segments comprising applying a multi-scale retinex enhancement procedure to said retinal image and obtaining a plurality of intensity values corresponding to color components of said vessel segments.