A method and structure for an optical coating for a bounding interface between optical components is provided. The system includes three leads with one lead being configured for implant in the coronary sinus for sensing, pacing, and defibrillating in both the left atrium and left ventricle. Furthermore, the portable scalable performance monitoring system may include multiple levels of data collection and control to increase scalability. The arrangement includes a nest having a first nest side and a second nest side. More particularly, the embodiments pertain to an image forming medium comprising photochromic materials comprising unsymmetrical dithienylethene photochromes which provide longer image lifetimes and \u201cerase-on-demand\u201d capability.