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 {HEAD ~ a vector} from the local reflective region to {TAIL ~ 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 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 { HEAD ~ a vector } from the local reflective region to { TAIL ~ the location } of a center of rotation of a nominal users eye
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