Astigmatism as a function of visual scan, head scan, and head posture

Contradictory views exist concerning astigmatism and its causes. Most consider it to be a structural anomaly following genetic and age patterns. Other attribute an undefined functional origin to the various forms of astigmatism. An investigation has revealed a relationship between changes in astigmatism and an observable triad consisting of eye scan, head movement, and head posture. This relationship is described and a model developed. Indications also exist that changing elements within this triad can have a positive effect in reducing astigmatism.