Another step comprises adjusting, by the one or more computers, a configuration of {HEAD ~ the reflective optical surface} so that each of the surface normals bisects the following two vectors: a vector from {TAIL ~ the local reflective region} to its associated content area; and a vector from the local reflective region to the location of a center of rotation of a nominal users eye 
Another step comprises adjusting , by the one or more computers , a configuration of { HEAD ~ the reflective optical surface } so that each of the surface normals bisects the following two vectors : a vector from { TAIL ~ the local reflective region } to its associated content area ; and a vector from the local reflective region to the location of a center of rotation of a nominal users eye
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH