A device for evaluating at least one individualized fitting parameter for a lens mounted in a spectacle frame facing the eye of a wearer, said spectacle frame comprising at least one temple and means for holding at least one lens in a holding plane, - said fitting parameter comprises a first pantoscopic angle (TETA1) formed between the holding plane and the vertical in the vision posture of the wearer; said measuring device comprises: - a flat supporting member containing a mark taking the form of a line segment; - a flat protractor rotatably mounted about a rotation axis cutting the straight line of the line segment forming the mark, so that said protractor is able to rotate in a plane parallel to the flat supporting member, said protractor comprising at least one visual radial marker passing through the rotation axis and designed to be aligned with the holding plane of the spectacle frame when the spectacle frame is placed on said flat supporting member, a temple being aligned with the mark of the flat supporting member, and the end of the temple proximal the holding plane of the frame being placed next to the rotation axis so that the angle formed between the mark of the flat supporting member and the radial marker corresponds to a second pantoscopic angle (TETA2) formed between, on the one hand, the projection of the temple of said frame onto the sagittal plane of the wearer, and on the other hand, the trace, on the same plane, of the front side of said frame; characterized in that: - said flat supporting member comprises a plurality of graduated scales, each graduated scale being associated with a preset postural parameter corresponding to a natural far vision posture of the wearer among the preset postures: head horizontal, head lowered and inclined forward, or head raised and inclined backward, the position of the radial marker relative to a graduated scale allowing said first pantoscopic angle (TETA1) to be read directly, in which said flat supporting member comprises a first graduated scale associated with a first preset postural parameter corresponding to a vision posture of the wearer wherein the head of the wearer is horizontal and for which the first pantoscopic angle (TETA1) is equal to the second pantoscopic angle (TETA2), and at least one second graduated scale (6', 6") associated with a second preset postural parameter (9', 9") corresponding to a vision posture of the wearer wherein the head of the wearer is inclined forward or backward, the graduations of said second scale (6', 6") being offset by a preset correction angle relative to said first scale. - said fitting parameter comprises a first pantoscopic angle (TETA1) formed between the holding plane and the vertical in the vision posture of the wearer; - a flat supporting member containing a mark taking the form of a line segment; - a flat protractor rotatably mounted about a rotation axis cutting the straight line of the line segment forming the mark, so that said protractor is able to rotate in a plane parallel to the flat supporting member, said protractor comprising at least one visual radial marker passing through the rotation axis and designed to be aligned with the holding plane of the spectacle frame when the spectacle frame is placed on said flat supporting member, a temple being aligned with the mark of the flat supporting member, and the end of the temple proximal the holding plane of the frame being placed next to the rotation axis so that the angle formed between the mark of the flat supporting member and the radial marker corresponds to a second pantoscopic angle (TETA2) formed between, on the one hand, the projection of the temple of said frame onto the sagittal plane of the wearer, and on the other hand, the trace, on the same plane, of the front side of said frame; characterized in that: - said flat supporting member comprises a plurality of graduated scales, each graduated scale being associated with a preset postural parameter corresponding to a natural far vision posture of the wearer among the preset postures: head horizontal, head lowered and inclined forward, or head raised and inclined backward, the position of the radial marker relative to a graduated scale allowing said first pantoscopic angle (TETA1) to be read directly, in which said flat supporting member comprises a first graduated scale associated with a first preset postural parameter corresponding to a vision posture of the wearer wherein the head of the wearer is horizontal and for which the first pantoscopic angle (TETA1) is equal to the second pantoscopic angle (TETA2), and at least one second graduated scale (6', 6") associated with a second preset postural parameter (9', 9") corresponding to a vision posture of the wearer wherein the head of the wearer is inclined forward or backward, the graduations of said second scale (6', 6") being offset by a preset correction angle relative to said first scale.