How Cutouts, Edges, and Openings Affect a Glass Heater Layout

https://engineered-thermal-hub.tearosediner.net/what-to-consider-before-installing-a-mica-heater

In camera windows, a glass heater must deliver heat in a controlled way. It uses a glass panel combined with a conductive heating layer or heater element. One useful trait is anti-fog capability. Still, thermal stress can change the result