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ColorDx color vision diagnostics

military grade color vision testing devices and books

Clinical Benefits of Diagnostic Color Vision Testing

Tritan (S-cone or blue-yellow type) deficiencies are rarely genetic, yet may be as high as 15% of the general population and more common with aging.  Acquired deficiencies are commonly Tritan S-cone type, but may also affect L and M-cones (red and green).  This important, but very often overlooked clinical sign, may be caused by retinal, optic nerve, or neurological disorders, in addition to trauma, cataracts, and hundreds of common drugs. Individuals may have both genetic and acquired color deficiencies. High granularity color vision testing may be helpful for assessing changes over time that have been viewed as normal prior or commonly missed entirely.

Testing for acquired color vision deficiencies is grossly underutilized. Commonly used color vision tests (such as printed pseudo-isochromatic “Ishihara plates” designed in the early 1900’s), may only test genetic deficiencies completely missing blue (S-cone) deficiencies as well as being not quantitative.

Contemporary eyecare includes qualitative and quantitative assessment of this important measure of functional vision.  ColorDx CCT-HD is the state-of-the-art system to assess color vision deficiencies in high fidelity.

ColorDx Applications

professional, military-grade color vision diagnostics

ColorDx® CCT-HD™

CCT-HD™, developed in collaboration with the US Air Force Operational Based Vision Assessment team under CRADA, represents the new gold standard for color vision diagnostics. Featuring the robust Psi-marginal method for threshold determination, CCT-HD expands on the strengths of the original cone contrast test (CCT) built from the ground up with entirely new architecture, highlights include:


  • Cone-Isolation methodology
  • "Landolt C" based test strategies
  • Simple to use 4-button response pad
  • Robust thresholding and standard error
  • Konan custom-calibrated IPS display technology
  • Rapid, intuitive, staged calibration
  • Expanded low-contrast range testing
  • High fidelity cone-contrast granularity
  • Expansive illustrated reporting
  • Auto trends analysis
  • Contrast Sensitivity (achromatic) with auto AUC calculation
  • Landolt C high contrast acuity
  • … and much more

ColorDx Extended 104 Pseudo-Isochromatic

The ColorDx Extended 104 test is a computerized color vision diagnostic test using a pseudo-isochromatic confusion-color concept pioneered by Ishihara.  Waggoner’s Extended 104 test is designed to qualitatively classify deficiencies as Deutan – Protan – Tritan as well as quantitatively Mild – Moderate – Severe. A non-pseudoisochromatic D-15 test color-ordering test is also included pre-installed on Windows Surface 3 tablet.


  • Pseudo-isochromatic “confusion-color” methodology
  • Validated by NAMI
  • Self-administering, self-scoring
  • D-15 and pediatric test included
  • Limited availability of Microsoft factory-refurbished Surface 3 (while supplies last) … call for availability!

ColorDx Print

ColorDx Standard 24

This Standard 24 pseudoisochromatic (“PIP-24”) test has been validated for use for color vision deficiency screening of US Navy aviators. The FAA has accepted this test to be used by aviation medical examiners for pilots’ annual physicals which require color vision testing. The Standard 24 test is designed primarily for detection of deficiencies most commonly attributed to heredity.

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