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A Comparative Analysis of Interpupillary Distance Measurement Techniques Evaluation in Modern Times: From Rulers to
Yee Rin Jung1, Byoung Sun Chu1
1School of Optometry and Vision Science, Daegu Catholic University, Gyeongsan-si, Republic of Korea.
Clinical Optometry
|December 19, 2024
Summary
Mobile apps offer a viable alternative for measuring interpupillary distance (IPD), showing comparable results to traditional methods for general screening. While differences exist, they remain within acceptable clinical tolerances for many applications.
Area of Science:
- Ophthalmology
- Medical Technology
- Digital Health
Background:
- The integration of mobile health (mHealth) applications into various medical fields, including eye care, is rapidly expanding.
- Accurate interpupillary distance (IPD) measurement is crucial for proper optical correction and binocular vision assessment.
Purpose of the Study:
- To compare the accuracy and consistency of interpupillary distance (IPD) measurements obtained from a non-contact mobile phone application against established clinical contact methods.
- Evaluate the utility of mobile applications as a screening tool in optometry and ophthalmology.
Main Methods:
- A study involving 40 participants compared IPD measurements using a pupillometer (gold standard), PD ruler, autorefractor, and a mobile phone application (Eye Measure).
- Bland-Altman analysis and repeated measures ANOVA were employed to assess mean differences and agreement between measurement techniques.
- Measurement consistency was evaluated through the correlation of two consecutive readings for each method.
Main Results:
- Significant differences in distance IPD measurements were observed across methods, with the mobile app yielding smaller values and the PD ruler larger values compared to the pupillometer.
- For near IPD, the PD ruler showed significantly larger measurements than both the pupillometer and mobile app, with no significant difference between the latter two.
- All methods demonstrated strong consistency, with high correlations (r=0.9) between consecutive measurements.
Conclusions:
- Despite measurement variations, the induced prism discrepancies fell within the ISO 16034:2002 tolerance (<0.33 prism diopter), suggesting mobile apps are suitable for general IPD screening.
- Mobile applications can serve as an efficient tool for widespread IPD screening, particularly in resource-limited settings.
- Clinical caution is advised when using mobile apps for IPD measurement in cases of complex eye conditions or misalignment.
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