The purpose of this retrospective study was to quantify and establish the magnitude and direction of the change in the accommodative and convergence index scores measured in visual training patients treated at the Pacific College of Optometry clinics to determine if the results were statistically significant. Professor Haynes' Normative Case Analysis program for the Macintosh computer was used to calculate pre and post Ai and Ci scores for non-strabismic, non-amblyopic patients who had completed a program of vision training. We found that ninety percent of patients who underwent vision training showed a statistically significant change in one or both of their index scores. These findings compared extremely well with a similar study done thirteen years earlier. 6
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