Abstract: An imaging device includes an image acquisition device to which there corresponds an imaging axis and a viewing screen to which there corresponds an observation axis and two units hinged together in the manner of a pendulum about a horizontal pivot axis at the top. One of these units is an imaging unit that includes the image acquisition device and to which the orientation of the corresponding imaging axis is tied. The other one is an observation unit which includes the viewing screen and to which the orientation of the corresponding observation axis is tied. The center of gravity of the imaging unit is below the pivot axis. There is preferably a detector responsive to the position of the observation unit. Applications include acquisition by an optician of an image of a person wearing an eyeglass frame to be fitted with lenses.

Abstract: A calibration gage for calibrating a device for reading off the contours of eyeglass frames is designed to be fitted to the contour reading off device to be calibrated in place of an eyeglass frame. It includes a plate with at least two ribs projecting from it. The ribs are generally parallel to each other in a first direction and spaced from each other in a second direction. By reading off the known dimensions between their inside and outside flanks, it is possible to determine some parameters of the contour reading off device.