The invention relates to a method for determining at least one optical design parameter of a progressive ophthalmic lens intended to be attached to a frame selected by a wearer, depending on the wearer's visual behavior. The method comprising the steps of: a) being placed in a situation in which the wearer performs a visual task at a first working distance； b) during this visual task at least two gaze directions of the wearer at the first working distance Is determined in the reference system of the wearer's head, c) the relative position of the surface relating to the ophthalmic lens intended to be attached to the frame or the frame is in this reference system of the wearer's head D) determining for each gaze direction at the first working distance judged in step b) the point of intersection of this gaze direction with the surface at the first working distance and comparing these on the surface And e) deriving from the map the desired optical design parameters to be obtained.
