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ColorDx Clinical Resources

ColorDx Clinical Resources

ColorDx Clinical Resources

ColorDx Clinical Resources

ColorDx Clinical Resources

ColorDx Clinical Resources

Video Tutorial:

How to use ColorDx

Growing Your Practice with Diagnostic Color Vision Testing

We have incorporated ColorDx at our practice over the past year with great results. We started with the software downloaded to a dedicated desktop computer but have now incorporated the tablet version for improved mobility within our practice. We are able to get a much more detailed assessment of color vision status for our patients not only with congenital color vision deficits but more importantly for those with acquired color vision loss due to optic nerve disease and complications of high risk ocular medications such as Plaquenil. The system is easy to administer for our technicians and easy to perform for our patients.

The use of procedure code  92283 provides third party reimbursement that far more than offsets the cost of the system.  We highly recommend the ColorDx system for optometry and ophthalmology practices.

S. Barry Eiden, OD, FAAO

President and Medical Director, North Suburban Vision Consultants, Ltd.

I downloaded ColorDx on my iPAD and the first patient I saw today was a 3 year old whose mother complained that she is having a hard time teaching the child colors and she feels like the child is color blind.  Her child turned out to have a protan defect!  It was great because usually I would have to send someone to another office for extended color vision.  Glad I learned about this awesome program!
Alexia Vaughn, OD

Advanced Eye Care

Konan Medical's ColorDx: Pilot Color Vision Research and Recommendations

Pilot Color Vision Research and Recommendations

Millrun N, Chidester T, Peterson S, Roberts C, Perry D, Gildea K. AsMA.  May 2013.

Konan Medical's ColorDx: The US Army Color Vision Study

The US Army Color Vision Study

Capó-Aponte J, Temme L, Robinson J, Still D (May 2014). The US Army Color Vision Study. AsMA.

Konan Medical ColorDx: Evaluation of Waggoner Computerized Color Vision Test

Evaluation of Waggoner Computerized Color Vision Test

Quiroz J, Ng J, Eum S, Trevathan A, Tran C, Self E. WPA 2013.

Konan Medical ColorDx: Preliminary Validation of a Computerized Color Vision Test

Preliminary Validation of a Computerized Color Vision Test

Picken D, Mann W, Rings M. AsMA 2013.

Konan Medical ColorDx: Assessment of Color Vision Screening Tests for U.S. Navy Special Duty Occupations

Assessment of Color Vision Screening Tests for U.S. Navy Special Duty Occupations

Reddix M, Williams H, Kirkendall C, Eggan S, Gao H, Wells W, O’Donnell O. AsMA 85th Scientific Meeting. May 2014.

Konan Medical ColorDx:

Testability of a Color Vision Screening Test in a Population with Mental Retardation

Erickson, G. B., & Block, S. S. (1999). Testability of a color vision screening test in a population with mental retardation. Journal of the American Optometric Association70(12), 758-763.

Konan Medical ColorDx: Evaluation of a New Color Vision Test: Color Vision Testing Made Easy

Evaluation of a New Color Vision Test: Color Vision Testing Made Easy

Cotter, S. A., LEE, D. Y., & French, A. L. (1999). Evaluation of a New Color Vision Test:” Color Vision Testing Made Easy (R)”. Optometry & Vision Science76(9), 631-636.

Konan Medical ColorDx: Clinical Ocular Toxicology Substances and Pharmaceutical Agents that can Cause Color Vision Defects

Clinical Ocular Toxicology Substances and Pharmaceutical Agents that can Cause Color Vision Defects

Fraunfelder, Fraunfelder, Chambers. Clinical Ocular Toxicology. Sanders Elsevier, 2008: 320.

normal deutanDeutan Factoids:

  • Deutans are green weak
  • Deuteranope are severely color deficient

A person with a Deutan deficiency called Deuteranomaly (5% of males) is considered to be “green weak” This deficiency is similar to the Protan type as there is also difficulty in discriminating between red – orange – yellow – green portions of the color spectrum … they are confused as being very similar. These colors seemed similar to the red portion of the spectrum.

An important differentiation from Protan type deficiencies is that Deutans do not have the loss of brightness for the confused colors.

From a practical standpoint, many Protan and Deutan persons find life’s journey relatively unaffected compared to color normal persons. Some may not be aware that their color perception is different from other persons.

Deuteranopia (1% of males) has the same hue discrimination problems as the Protonope, but without the dimming. The names red, orange, yellow, and green really mean very little aside from being different names that other persons seem to be able to agree on.

normal protanProtan Factoids:

  • Red weakness
  • More common in males
  • Similar functionally to Deutans

A person with “red deficiency” or “red weakness” is a Protan and the condition is called Protanomaly. The appearance of “redness” by a color normal observer is seen more weakly by the Protan viewer both in terms of its color power (saturation or depth of color) and its brightness. Red, orange, yellow, and yellow-green appear somewhat shifted in “hue” (another word for color) towards green and appear less intense that they do to a color normal observer. The redness portion of a violet or lavender color is also weakened with a Protan so what appears contains mostly the blue component of the color. Thusly, what a color normal calls “violet, may appear only as another shade of blue to the Protan.

Under poor viewing conditions, such as when driving in dazzling sunlight or in rainy or foggy weather, Protan observers may mistake a blinking red traffic light for a blinking yellow, or fail to distinguish a green traffic light from the “white” lights in store fronts, street lights or other general lighting.

normal tritanTritan Factoids:
  • Blue color deficiency
  • Normally an acquired condition
  • Pharmaceutical agent toxicity may cause
  • Neurologic conditions may cause

Tritan or “blue deficiency” is normally an acquired deficiency as opposed to the red-green genetic varieties. Tritan deficiencies are relatively uncommon, however the dated Ishihara pseudo isochromatic plates still in common use today do not test this type of color deficiency well.

Acquired color vision deficiencies can result from aging changes to the crystalline lens, certain prescription drug toxicities, and neurologic conditions. In an aging population, it has never been more important to discover Tritan defects. The ColorDx app provides efficient assessment of acquired and genetics color vision defects.

Take the ColorDx Test Now!

This on-line color vision screening test consists of 8 plates taken from the PIP 24 Plate Color Vision Test. You have 3 seconds to identify the number on each of the plates.

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