Journal of Research in Medical Sciences1735-1995522000060135133513ENSFAHAN UNIVERSITY OF MEDICAL SCIENCES AND HEALTH SERVICES, ISFAHAN2000060120090415Introduction. This study was conducted to define some standard measures for interpupillary distance (PD) in different age groups of an Iranian population. Methods. This study was performed on 1500 patients aged between 5 to 80 years (947 cases older than 19 years) referring to Farabi hospital (Ophtalmologic Center affiliated to Isfahan University of Medical Sciences and Health Services) during 1992-1993. Complete ophtalmologic examination was done for each patient including interpupillary distance measurement by objective autorefractometer. Non of the cases had any other ocular pathology except primary refractive error. Results. The mean of P.D in adults was 62z3.73 mm. This mean was 61.13±3.47 mm in women and 63.57±3.90 mm in men (P<0.001). In 96.2 percent of adults PD was in a range of 55-70 mm. This study indicates the association between PD and age (r=0.33 in women and r=0.47 in men). Discussion. PD is larger in men than women. The increasing of PD is continued even after 30 years old.http://jrms.mui.ac.ir/index.php/jrms/article/view/3513