Posters

Interpupillary distance values in an Iranian population: the correlation of three methods of IPD measurement

Poster Details

First Author: F.Aghajani IRAN

Co Author(s):    A. Haghparast   S. Sobhani   A. Moradi   F. Nourizadeh   A. Shojaei        

Abstract Details

Purpose:

This study aims to report normative values and ranges of interpupillary distance (IPD) in an Iranian population. Furthermore, this study provides a comprehensive measurement of the far IPD on the binocular level, by the three different methods of PD meter, PD ruler and Autorefractometer.

Setting:

We conducted this study in the optometry clinic of Basir Eye Hospital, Tehran, Iran; during April 2018 and January 2019.

Methods:

In total, 378 participants were involved in this prospective study. They all underwent a complete ophthalmologic examination. IPD and refractive errors were measured while the subject was in a correct position toward the device. In the optometric visit, for determining the values of spherical equivalents and far IPD of each participant, we used three methods: Autorefractometer, PD meter, and PD ruler. SPSS software (version 23) was used for statistical analyses.

Results:

The mean age was 44.19±19.86 years (range 5-92). The mean IPD was calculated as 61.95±3.83 mm by PD meter, 61.21±3.76 mm by PD ruler; and 62.57±3.79 mm by autorefractometer. The average Intraclass Correlation Coefficients was measured to be 0.96 between the three methods. The limit of agreement between the two methods of PD meter and PD ruler is 0.96±3.23 mm, -0.64±3.25 mm between PD meter and autorefractometer, and 1.38±3.63 mm between autorefractometer and PD ruler.

Conclusions:

The current study offers the population-specific normative values on far IPD, measured by three methods. Knowledge of normal IPD values in a population is considered useful in designing stereoscopic content, as well as studying orbito-cranial growth patterns, syndrome diagnosis, and surgical management of cranio-facial deformities and trauma. We suggest that IPD measurement by the three methods of PD meter, PD ruler and autorefractometer have a good correlation with each other.

Financial Disclosure:

None