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Reliability of the developmental eye movement test.

Gale Orlansky¹, Kristine B Hopkins, G Lynn Mitchell

¹Pennsylvania College of Optometry at Salus University, Philadelphia, Pennsylvania 19141, USA. gorlansky@salus.edu

Optometry and Vision Science : Official Publication of the American Academy of Optometry

|October 4, 2011

Summary

The Developmental Eye Movement (DEM) test shows inconsistent repeatability for ratio and error scores in children aged 6-11. Clinicians should use caution when diagnosing saccadic dysfunction with the DEM test alone.

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Area of Science:

Ophthalmology
Developmental Pediatrics
Vision Science

Background:

The Developmental Eye Movement (DEM) test is frequently used by optometrists to assess saccadic eye movements.
Saccadic dysfunction can impact reading and other visual tasks.
Understanding the test-retest reliability of the DEM is crucial for accurate diagnosis and treatment monitoring.

Purpose of the Study:

To evaluate the repeatability of the Developmental Eye Movement (DEM) test.
To assess within- and between-session reliability of DEM scores in children.
To determine the diagnostic classification stability of the DEM test.

Main Methods:

181 children aged 6-11 years with normal vision and binocularity were tested.
Three versions of the DEM test were administered consecutively on two separate visits.
Repeatability of vertical-adjusted time, horizontal-adjusted time, ratio, and error scores was analyzed.

Main Results:

Within-session repeatability was good to excellent for vertical and horizontal adjusted times, but poor for ratio and error scores.
Between-session reliability (intraclass correlation coefficients) was fair to good for vertical/horizontal scores, but poor for ratio/error scores.
Pass-fail classification stability varied, with 71-100% consistency for vertical/horizontal scores and 47-100% for ratio/error scores.

Conclusions:

The DEM test demonstrates variable repeatability, particularly for ratio and error scores, in children aged 6-11.
Clinicians should exercise caution when using the DEM test in isolation for diagnosing saccadic dysfunction.
The findings suggest potential improvements in DEM scores without intervention in this age group, impacting diagnostic interpretation.