1. A system for fitting a user with a pair of glasses, the system comprising; a fitting pad configured to be placed on the forehead of the user, the fitting pad having a first detection point and a second detection point at a predetermined distance from the first detection point; a camera for capturing an image of the user, including the user's pupils, as the user wears the fitting pad; a user interface; and a processor in communication with the user interface and the camera; wherein the processor prompts the user to locate, via the user interface, the location of the first and second detection points; and wherein the processor utilizes the confirmed location of the first and second detection points to calculate the number of pixels on the image between the first and second detection points, so as to provide a pixels-per-inch calculation for the captured image.