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Developmental Eye Movement™ Test (DEM™)


Item #: DEM+
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  • Developmental Eye Movement Test™ (DEM™) (Includes Scoring Software)
  • Product not available to general public. Healthcare Professionals, Schools, & Government, please login for pricing. Click on the blue info button for more details

  • DEM™ Examiner's Manual
  • Product not available to general public. Healthcare Professionals, Schools, & Government, please login for pricing. Click on the blue info button for more details

  • DEM™ Scoring Software (Updated in 2016)
  • Product not available to general public. Healthcare Professionals, Schools, & Government, please login for pricing. Click on the blue info button for more details

  • DEM&trade; Replacement Test Plates <i>(Instructions & Test Standards Not Included)</i>
  • Product not available to general public. Healthcare Professionals, Schools, & Government, please login for pricing. Click on the blue info button for more details

  • DEM&trade; Score Sheets (Pad of 25)
  • Product not available to general public. Healthcare Professionals, Schools, & Government, please login for pricing. Click on the blue info button for more details

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Bernell's exclusive DEM™ test provides an objective method of assessing fixational and saccadic activity during reading and non-reading tasks.

The Developmental Eye Movement Test incorporates a sub-test of number calling in a vertical array which provides the means to evaluate oculomotor function with numbers in a horizontal array. The DEM™ was developed by Dr. Jack Richman, OD and Dr. Ralph Garzia, OD.

Test comes with a Manual (2nd Edition) which includes instructions as well as 60+ pages of tables of standards based on age and grade level. Some case histories and clinical treatment considerations are also presented. Also included is scoring software which displays the comparisons to standardized scores as shown in the 60+ pages of tables. The software saves time and prevents errors in reading the many tables. Please note: the software is only compatible with Windows and is not supported on Mac. Click here to download DEM Scoresheet Instructions. A pad of 25 evaluation sheets also comes with the test. Additional scoring sheets may be purchased.


Update: we were recently made aware of a printing error that occurred during the printing of the Version 2.5 manuals. The printing error occurred on the first page of Table 4 "Vertical Time AGE 9.0 - 9.11". This was correct in previous versions of the manual and has since been corrected in Version 2.7 and after. However, if you purchased a Version 2.5 manual then you may download this pdf with the updated pages.Click here to download

Additional note: There was a repeating error in the 2015 scoring software that caused it to list the H/V ratios for grade levels as the same percentiles. This has been corrected, as well as some other tweaks to the software to improve the layout. If you purchased a DEM after November 1st, 2015 or purchased the scorer software alone, please contact info@bernell.com to get a link to download the new software update.

DEM Calculator App     Click here to watch the DEM Calculator App in action.

New Mobile Scoring Software available through Google Play or iTunes App Store.
If you are interested in having a DEM scoring software available on your phone or tablet, Bernell has partnered with MakeMind, a developer in Australia, to release a new scoring app for the DEM known as the DEM Calculator. This app is available for purchase through iTunes App Store or the Goggle Play Store. Please click on the buttons below to learn more about the app.

iTunes       Goggle Play Store
Developmental Eye Movement Test™ (DEM™) Includes:
→ Test Plates
→ Scoring Software (Windows Compatible, not supported on Mac)
→ Pad of Evaluation Sheets (Pkg. of 25)


Studies Supporting the DEM™:

King Devick Test VS. Developmental Eye Movement Test , by Basiliki Evelyn Tomaras and Sarah Trommater Senior Class Project 2004

Garzia RP, Richman JE, Nicholson SB, Gaines CS. "A new visualverbal saccade test: the development eye movement test (DEM)."
Journal of Optometry Association. 1990 Feb; 61(2): 124-135


Garzia RP, Richman JE, Walker AJ. "The impact of automatic digit naming ability on a clinical test of eye movement functioning." Journal ofOptometry Association. 19983 Jul;54(7): 617-22.

Kapoor N, Ciuffreda KJ. "Assessment of neuro-optometric rehabilitation using the Developmental Eye Movement (DEM) test in adults with acquired brain injury." Journal of Optometry. 2017 Jul; S188-4296(17)30040-7.

Kulp MT, Schmidt PP. "The relation of clinical saccadic eye movement testing to reading in kindergartners and first graders." Optometry Vision Science. 1997 Jan;74(1):37-42.

Kulp MT, Schmidt PP. "Relationship between visual skills and performance on saccadic eye movement testing." Optometry Vision Science. 1998 Apr; 7 5 ( 4): 284-7.

Xie Y, Shi C, Tong M, Zhang M, Li T, Xu Y, Guo X, Hong Q, Chi X. "Developmental Eye Movement (DEM) Test Norms for Mandarin Chinese-Speaking Chinese Children." Public Library of Science. 2016 Feb; 26881754.


"Frequency of Visual Deficits in Children With Developmental Dyslexia." JAMA Ophthalmology

"Vision and Academic Performance in Primary School Children." School of Optometry and Vision Science and Institute of Health and Biomedical Innovation

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