Due to the presence of various environmental condition detectors in the home and businesses such as smoke detectors, carbon monoxide detectors, natural gas detectors, etc. The method includes the step of storing a plurality of software product versions within a database. The method includes the steps of exciting a sample in a substrate with a beam of light that enters the substrate at an angle less than or equal to 45\xb0 C. A monocentric arrangement of optical components images the left and right scanning ball lens pupil at the corresponding left and right viewing pupil of the observer and essentially provides a single center of curvature for projection components.