An electrowetting optical device comprising: a non-aqueous conductive liquid and a non-conductive liquid, said liquids being non-miscible; and a dielectric enclosure on which both liquids are in contact and form a triple interface, wherein the non-aqueous conductive liquid comprises: a non-ionic polar organic solvent, and at least 2 weight % of a first compound; and wherein the first compound is non-aqueous and is ionic or non-ionic, the electrowetting optical device being characterized in that: if the first compound is non-ionic, the first compound is more polar than the solvent, the polarity of the non-ionic first compound being measured by Hansen parameters, a sum of the Hansen parameter for polarity (δ p) and of the Hansen parameter for hydrogen bonding (δ h) being higher than the sum of the corresponding Hansen parameters of the non-ionic polar organic solvent, and the non-aqueous conductive liquid further comprises an ionic second compound; and if the first compound is ionic, the non-aqueous conductive liquid further comprises from 0.01 weight % to 6 weight % of water. a non-aqueous conductive liquid and a non-conductive liquid, said liquids being non-miscible; and a dielectric enclosure on which both liquids are in contact and form a triple interface, wherein the non-aqueous conductive liquid comprises: a non-ionic polar organic solvent, and at least 2 weight % of a first compound; and wherein the first compound is non-aqueous and is ionic or non-ionic, the non-aqueous conductive liquid comprises: a non-ionic polar organic solvent, and at least 2 weight % of a first compound; and a non-ionic polar organic solvent, and at least 2 weight % of a first compound; and the first compound is non-aqueous and is ionic or non-ionic, the electrowetting optical device being characterized in that: if the first compound is non-ionic, the first compound is more polar than the solvent, the polarity of the non-ionic first compound being measured by Hansen parameters, a sum of the Hansen parameter for polarity (δ p) and of the Hansen parameter for hydrogen bonding (δ h) being higher than the sum of the corresponding Hansen parameters of the non-ionic polar organic solvent, and the non-aqueous conductive liquid further comprises an ionic second compound; and if the first compound is ionic, the non-aqueous conductive liquid further comprises from 0.01 weight % to 6 weight % of water. if the first compound is non-ionic, the first compound is more polar than the solvent, the polarity of the non-ionic first compound being measured by Hansen parameters, a sum of the Hansen parameter for polarity (δ p) and of the Hansen parameter for hydrogen bonding (δ h) being higher than the sum of the corresponding Hansen parameters of the non-ionic polar organic solvent, and the non-aqueous conductive liquid further comprises an ionic second compound; and the first compound is more polar than the solvent, the polarity of the non-ionic first compound being measured by Hansen parameters, a sum of the Hansen parameter for polarity (δ p) and of the Hansen parameter for hydrogen bonding (δ h) being higher than the sum of the corresponding Hansen parameters of the non-ionic polar organic solvent, and the non-aqueous conductive liquid further comprises an ionic second compound; and if the first compound is ionic, the non-aqueous conductive liquid further comprises from 0.01 weight % to 6 weight % of water. the non-aqueous conductive liquid further comprises from 0.01 weight % to 6 weight % of water.