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.
D000293:Adolescent; D000328:Adult; D001251:Astigmatism / Q000209:etiology* / Q000503:physiopathology / Q000628:therapy; D002648:Child; D002675:Child, Preschool; D005133:Eye Movements; D005260:Female; D006257:Head / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement; D011187:Posture