Two or more of the optical elements have a different shape. At least one element has a non-spherical shape, preferably with a cylindrical modification chosen for correcting an eye aberration. At least two of the optical elements forming the lens can be moved in a direction at right angles to the optical axis. The elements display different optical strengths when in different positions. One element (6) is fixed and has a fixed optical strength and two movable elements (7, 8) with a different shape than the fixed one are also provided.
