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Related Experiment Video

Updated: Nov 14, 2025

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes
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Spotlight on the Developmental Eye Movement (DEM) Test.

Alessio Facchin1,2

  • 1Materials Science Department & COMiB Research Centre in Optics and Optometry, University of Milano-Bicocca, Milano, Italy.

Clinical Optometry
|March 10, 2021
PubMed
Summary

The Developmental Eye Movement (DEM) test offers a simple way to assess children's eye movement skills. While useful for identifying reading-related visual problems, clinicians should note potential learning effects with repeated use.

Keywords:
DEM testeye movementnormative datapsychometric testreading

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Area of Science:

  • Ophthalmology
  • Pediatric Optometry
  • Neuroscience

Background:

  • Ocular motor skills are crucial for reading and learning.
  • Assessing these skills in children can be challenging.
  • The Developmental Eye Movement (DEM) test is a widely used tool.

Purpose of the Study:

  • To review the literature on the DEM test.
  • To evaluate its psychometric properties, strengths, and weaknesses.
  • To discuss its clinical application and interpretation.

Main Methods:

  • Literature review of studies on the DEM test.
  • Analysis of psychometric properties, including validity and repeatability.
  • Examination of normative data across different languages and countries.

Main Results:

  • The DEM test is a practical method for quantifying ocular motor skills.
  • It measures aspects of eye movement related to reading.
  • Repeatability concerns exist due to a learning effect over sessions.
  • Normative data is available in nine languages.

Conclusions:

  • The DEM test is a valuable clinical tool for rapid eye movement assessment.
  • Awareness of the learning effect is crucial for correct interpretation.
  • It aids in identifying vision-related visual problems in children.