An optical device with a deformable membrane including an anchor zone on a support contributing to trapping fluid, a central zone reversibly deforming from a rest position, and an actuating mechanism to displace fluid acting on the membrane in an intermediate zone between the anchor and central zones. The actuating mechanism includes a principal actuation mechanism and supplementary actuation mechanism each arranged in at least one ring mounted around the central zone, each ring including one or plural piezoelectric actuators, and being anchored on the intermediate zone, only the supplementary actuation mechanism may be anchored to the support, these actuation mechanisms and the membrane to which they are anchored forming at least one piezoelectric bimorph, such that they contract or expand in the radial direction during actuation such that when the fluid moves, it deforms the central zone.