1. A system, comprising: an interactive head-mounted display including an optical assembly through which displayed content and at least a portion of a surrounding environment are viewable, an integrated processor for handling content for display via the optical assembly, and an integrated image source for introducing the content to the optical assembly, wherein the optical assembly comprises a photochromic layer and a heater layer disposed on a see-through lens of the optical assembly, wherein the photochromic layer is configured to be heated by the heater layer to accelerate a transition from darker to less dark.