An electro-optic device includes a front substrate defining a first surface and a second surface. A rear substrate defines a third surface and a fourth surface. A seal is disposed about a periphery of the second surface and the third surface. A space is defined between the front substrate, the rear substrate, and the seal. An electro-optic medium is disposed within the space. A first conductive material is disposed on the second surface of the front substrate. A second conductive material is disposed on the third surface of the rear substrate. At least one isolation line extends across at least one of the first conductive material and the second conductive material to define independently controlled dimming regions.