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 (ST1) 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 (ST1) 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 . <EOS>