Switchable optical device having a first substrate, a second substrate and a seal, the two substrates (11, 12) and the seal being arranged such that a cell having a cell gap is formed, wherein the size of the gap is from 3 μm to 50 μm, a switchable medium being located inside the cell gap, the first substrate having a first transparent electrode and the second substrate having a second transparent electrode, the electrodes (21, 22) facing towards the cell gap, the two substrates (11, 12) being arranged such that the first substrate has a first region adjacent to a first edge of the first substrate which does not overlap with the second substrate and that the second substrate has a second region adjacent to a second edge of the second substrate which does not overlap with the first substrate, a first electrically conducting busbar being arranged in the first region and a second electrically conducting busbar being arranged in the second region, a first terminal being electrically connected to the first busbar and a second terminal being electrically connected to the second busbar, wherein the first substrate and the second substrate each have an edge deletion in which the transparent conductive electrodes (21, 22) are removed, wherein the edge deletion is complete on the edges non-adjacent to a busbar (31, 32) and there is only partial edge deletion on edges adjacent to a busbar (31, 32), wherein a distance between the first busbar and the second busbar is up to 3.5 m and the sheet resistance of the first transparent electrode and the second transparent electrode is less than 100 Ohm/square when the distance is less than 1.8 m, the sheet resistance of the first transparent electrode and the second transparent electrode is less than 50 Ohm/square when the distance is from 1.8 m to less than 2.6 m and the sheet resistance of the first transparent electrode and the second transparent electrode is less than 30 Ohm/square when the distance is from 2.6 m to 3.5 m, wherein the edge deletion of the first substrate further includes a portion at a first end and/or a second end of the first edge and the edge deletion of the second substrate further includes a portion at a first end and/or a second end of the second edge, wherein the respective portion has a length parallel to the respective edge (41, 42) of at least 2 mm, and wherein the first terminal is a first terminal wire which is arranged parallel to the first edge and the second terminal is a second terminal wire which is arranged parallel to the second edge and wherein the position and length of the first terminal wire and the position and length of the second terminal wire are chosen such that the first terminal wire does not protrude from the first substrate and the second terminal wire does not protrude from the second substrate. wherein the edge deletion of the first substrate further includes a portion at a first end and/or a second end of the first edge and the edge deletion of the second substrate further includes a portion at a first end and/or a second end of the second edge, wherein the respective portion has a length parallel to the respective edge (41, 42) of at least 2 mm, and wherein the first terminal is a first terminal wire which is arranged parallel to the first edge and the second terminal is a second terminal wire which is arranged parallel to the second edge and wherein the position and length of the first terminal wire and the position and length of the second terminal wire are chosen such that the first terminal wire does not protrude from the first substrate and the second terminal wire does not protrude from the second substrate.