Lens with variable focus and symmetry

The invention relates to a variable focal length lens with - a chamber (10) having symmetry of revolution around an axis (14) and containing one first transparent fluid (20) and one second transparent fluid (22) that have different optical indices and are immiscible, so as to form a meniscus (24), and that have different electrical conductivity's, and - means (30, 40) to modify the curvature of the meniscus. According to the invention, the means to modify the curvature of the meniscus comprises means of applying an electric field dissymmetrical in relation to the axis of said chamber. The invention has applications in the production of cameras.