Date of Award


Degree Type


Degree Name

Master of Science in Vision Science

Committee Chair

Paul Kohl


This study was undertaken to determine if an individual with an extremely large or small interpupillay distance (PD) predisposed them to manifesting a similarly extreme near phoria. It was hypothesized that large PDs are more likely to be associated with higher exophoria than the norm and that small PDs would be associated with larger esophoria than the norm. The subject population was obtained from the patient records at the primary care clinic of Pacific University College of Optometry in Forest Grove, Oregon. Selected subjects were placed in either a large or small PD group and the distribution of their near phorias was analyzed. The large PD group had a mean near phoria of 4.3^ exophoria and the small PD group's was 2.9^ exophoria. This difference was not statistical significant (p=0.1249). The results of this study suggests that an extreme PD , either large or small, does not predispose an individual to an excessive near phoria in a particular direction.

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