{HEAD ~ Another step comprises} adjusting, by the one or more computers, {TAIL ~ 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 the location of a center of rotation of a nominal users eye 
adjusting
{ HEAD ~ Another step comprises } adjusting , by the one or more computers , { TAIL ~ 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 the location of a center of rotation of a nominal users eye
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