Abstract: Provided is a composite lens structure and a method to prevent condensation buildup for use in eyewear that incorporates a glass cover slip, an electrically conductive thin film heating element, and a thermally conductive thin film intended to act as a heat spreader. The thermally conductive heat spreader accommodates for hot spots within the electrically conductive thin film heating element due to irregular geometry in eyewear. The method for heating the thin film heating element incorporates a thermal cutoff circuit intended to both heat the composite lens structure as well as preventing the thin film heater from reaching undesired temperatures. Analog circuitry may be used to determine the temperature setpoints for the thermal cutoff circuit.