1. A surgical system for measuring tissue, the system comprising: a first robotic tool having a tool tip; a stereoscopic image capture device orientable toward a surgical site for capturing left and right stereoscopic images of the tissue at the surgical site and capturing left and right stereoscopic images of the first robotic tool, the image capture device in use generating stereoscopic image data corresponding to the left and right stereoscopic images of the tissue at the surgical site and the first robotic tool; a stereoscopic display coupled to the image capture device so as to show the captured left and right stereoscopic images of the tissue at the surgical site and the captured left and right stereoscopic images of the first robotic tool to a system user; an input for designating tissue locations indicated by the first robotic tool, wherein the input is coupled to a master controller coupled with the first robotic tool for receiving movement commands from the system user to guide the first robotic tool to designate a first tissue location, with the first robotic tool tip disposed over the first tissue location as seen from a dominant eye of the system user, without touching the first tissue location, the first tissue location having one or more first points of interest within both of the left and right stereoscopic images of the tissue at the surgical site shown on the stereoscopic display; and a processor configured to track Cartesian position of the first robotic tool tip and to match an image of the one or more points of interest within one of the left and right stereoscopic images of the tissue at the surgical site to an image of the one or more points of interest within the other of the left and right stereoscopic images of the tissue at the surgical site, based upon local characteristics of the one or more points of interest, so as to determine a three-dimensional location of the tissue that corresponds to the matched one or more points of interest, wherein the three-dimensional location corresponds to the first designated tissue location indicated by the first robotic tool, and to superimpose a first graphical indicator on the stereoscopic images of the tissue at the determined three-dimensional location of the tissue that corresponds to the matched points of interest, without touching the first designated tissue location, the processor being further configured for generating a measurement between at least the first graphical indicator and a second designated tissue location; wherein the first graphical indicator is superimposed on the stereoscopic images of the tissue at the determined three-dimensional location that corresponds to the matched one or more points of interest, after the first robotic tool is moved to designate the first designated tissue location.