Do you want a faster way of measuring eye movement?
The Developmental Eye Movement Test (DEM) is an essential tool for detecting difficulties with reading 1 and eye movement 2. It was invented in 1983 by Dr Jack Richman - Professor at the New England College of Optometry, Boston.
Like many clinicians who value the test, I refer to the manual for results. This was a very time consuming process, which did not allow me to think on the spot. That was why we made the DEM Calculator App.
- Simple to Use
- Gives Instant Results
- Allows for Fast Decision Making
Looks good and easy to use.
This is a great timesaver! Thanks for creating.
The DEM calculator has allowed me to examine my patients quickly and accurately. I have move confidence in my diagnosis when using this App.
Very good App, it makes you consider everything ensuring accurate results.
How to Use the DEM Calculator?
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Select Age or Grade
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Press the Start Button to Start Recording
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Press the Stop Button to Stop Recording
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Note any errors by pressing the ‘+’ or ‘-’ keys
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When you are finished, proceed to the next test
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Your results are ready!
What do the Results mean?
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Vertical Time:
This is the patient’s number naming speed.
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Horizontal Time:
This is the patient’s eye movement speed after accounting for errors.
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Errors:
This is the patient’s accuracy for the three tests.
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Ratios:
This is determined by dividing the Adjusted Horizontal Time by the Vertical Time. The ratio score is used to compare automaticity and oculomotor control levels.
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DEM Type:
There are four likely outcomes:
- Type 1: Average Performance
- Type 2: Oculomotor Dysfunction
- Type 3: Poor Automaticity of Number Naming
- Type 4: Deficiencies in both Automaticity & Oculomotor skills
Results highlighted in orange are borderline
Results highlighted in red are abnormal
REFERENCE:
- Lauren N Ayton, Larry A Abel, Timothy R fricke, Neville McBrien. Developmental Eye Movement Test. What is it really measuring? Optometry and Vision Science Vol 86, No. 6, June 2009
- Manzoli, MV, Facchin, A. Pregliasco, R. (2014, November 28). “A comparison of objective (Readalyzer) and subjective (DEM test) evaluation of ocular movements”. Retrieved from this article.