Disclosed is a method for determining a parameter of an optical device including at least an optical lens, the method including: an optical system providing step, during which an optical system including a visual target, the optical device and an image acquisition module is provided in an initial configuration state, a parameter determining step during which a parameter of the optical device is determined based on the blur level of the images of the visual target acquired by the image acquisition module through the optical device in at least two different configuration states.