Method for switching an optical function of an optical article comprising: - a hollow chamber delimited by an outer wall, - a separator extending from the outer wall inwards, comprising a first side facing a first surface of the outer wall and a second side facing a second surface of the outer wall, the separator separating the hollow chamber into a first subspace and a second subspace, - the separator comprising an aperture, - the optical article comprising a deformable membrane, attached, in the second subspace, along a closed line surrounding the aperture, the closed line is delimiting an area greater than the aperture and fully covering the aperture, the deformable membrane separating the hollow chamber into a first cavity extending towards the first surface of the outer wall and a second cavity extending towards the second surface of the outer wall, - the optical article being switchable, by deformation of the membrane, between at least three states (ST1, ST2, ST3), and - the first cavity being filled with a first fluid having a first optical property, - the second cavity being filled with a second fluid having a second optical property, - the optical article having a different optical function for each of the at least three states (ST1, ST2, ST3), - the method comprising switching the optical function of the optical article between two of the at least three states by deforming the membrane, - the method being characterized in that said two of the at least three states include a first state wherein the deformable membrane is pressed against the separator such that the first cavity extends throughout the first subspace while the second cavity extends throughout the second subspace. - a hollow chamber delimited by an outer wall, - a separator extending from the outer wall inwards, comprising a first side facing a first surface of the outer wall and a second side facing a second surface of the outer wall, the separator separating the hollow chamber into a first subspace and a second subspace, - the separator comprising an aperture, - the optical article comprising a deformable membrane, attached, in the second subspace, along a closed line surrounding the aperture, the closed line is delimiting an area greater than the aperture and fully covering the aperture, the deformable membrane separating the hollow chamber into a first cavity extending towards the first surface of the outer wall and a second cavity extending towards the second surface of the outer wall, - the optical article being switchable, by deformation of the membrane, between at least three states (ST1, ST2, ST3), and - the first cavity being filled with a first fluid having a first optical property, - the second cavity being filled with a second fluid having a second optical property, - the optical article having a different optical function for each of the at least three states (ST1, ST2, ST3), - the method comprising switching the optical function of the optical article between two of the at least three states by deforming the membrane, - the method being characterized in that said two of the at least three states include a first state wherein the deformable membrane is pressed against the separator such that the first cavity extends throughout the first subspace while the second cavity extends throughout the second subspace.