Many patients and practitioners of manipulative therapies have reported anecdotal incidences of visual changes following manipulations of various kinds, from chiropractic to craniosacral therapy to osteopathic cranial manipulation. There is a general lack of research into whether these changes actually do occur and, if they do, what is their nature and extent. There are many documented case studies of these visual changes, often improvements, in the literature. These case studies inspired us to undertake this study, to try to document any visual changes following osteopathic cranial manipulation. An OD thesis by two of our predecessors at Pacific University College of Optometry researched the pertinent literature, both published and unpublished, concerning visual changes following cranial manipulation. The purpose of this study is to build upon this previous literature research by giving a series of visual tests to a group of normal subjects before osteopathic cranial manipulation and then repeating these same vision tests after the treatments to document any possible changes in an objective manner. The two optometric examiners were blinded as to what the osteopathic evaluation and treatment was for each subject to minimize prejudice in the optometric data gathering. The study showed that, at least for this group of 20 normal subjects, there was no statistically significant visual improvement following osteopathic cranial manipulation as measured by the optometric tests that were performed. However, some of the individual subjects reported subjective beneficial visual improvement. Because of this, more research is needed with a group of subjects who have had traumatic brain injury or spinal injury .
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