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Related Experiment Video

Updated: Apr 28, 2026

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Interpupillary Distance and Binocular Vision: Assessing the Association Between Anatomy and Sensory-Motor Functions.

Mosaad Alhassan1, Mona Aljami1, Rakan Alotaibi1

  • 1Department of Optometry, College of Applied Medical Sciences, King Saud University, P.O. Box 10219, Riyadh 11433, Saudi Arabia.

Brain Sciences
|April 27, 2026
PubMed
Summary

Interpupillary distance (IPD) impacts binocular vision. Larger IPD correlated with receding near point of convergence (NPC) and reduced distance stereopsis, indicating anatomical variations affect visual function.

Keywords:
binocular visionergonomicsinterpupillary distancenear point of convergencephoriastereopsis

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Area of Science:

  • Optometry
  • Ophthalmology
  • Vision Science

Background:

  • Interpupillary distance (IPD) is a fundamental anatomical measurement.
  • Understanding IPD's influence on binocular vision is crucial for clinical practice.

Purpose of the Study:

  • To investigate the relationship between interpupillary distance (IPD) and motor/sensory binocular vision functions.
  • To explore associations between various binocular vision parameters.

Main Methods:

  • Cross-sectional study of 100 participants (20-38 years old).
  • Measured distance and near IPD using a pupillometer.
  • Assessed horizontal phoria, near point of convergence (NPC), and stereopsis (TNO, Random-dot E).

Main Results:

  • No significant association between IPD and phoria.
  • Moderate correlation between IPD and NPC (distance/near).
  • Significant correlation between IPD and distance stereopsis; weak/non-significant at near.
  • Strong correlation between NPC and distance stereopsis.

Conclusions:

  • Increased IPD is linked to receding NPC and decreased distance stereopsis.
  • Anatomical variations in IPD significantly influence binocular vision, particularly at distance.