Abstract: A method for measuring the optical parameters of a phase object, comprising recording a moiré pattern viewed through said phase object, said moiré pattern being formed by illuminating by means of a source of diffuse light, first and second gratings positioned in the space between said light source and said phase object, wherein the plane of said first grating is parallel to the plane of said second grating, and calculating the optical parameters of interest from said moiré pattern.

Abstract: A method and a system of adjusting a progressive lens relative to the frame of a patient's spectacles. The lens has power and distortions distributions and far and near vision zones and is selected inter alia in accordance with respective prescribed first and second values of the optical power required for the patient's eye at its reading and distance vision. A direction of a line of sight of the patient's eye at the reading vision, relative to the frame of the spectacles, is determined. The lens is positioned and oriented relative to the frame so as to ensure that the line of sight passes through the near vision zone of the progressive lens.