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