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ColorDx color vision diagnostics

military-grade, cone-isolation contrast sensitivity and pseudo-isochromatic

ColorDx CCT-HD

new state-of-the-art, cone-isolation contrast sensitivity, color vision diagnostics

ColorDx® CCT-HD™

Developed by and licensed to Konan Medical in collaboration with the United States Air Force School of Aerospace Medicine OBVA (Operational Based Vision Assessment) laboratory under CRADA, CCT-HD represents the new gold standard for color vision diagnostics.

Featuring a robust beyesian technique, "Psi-marginal Adaptive", for threshold determination, CCT-HD expands on the strengths of the USAF original cone-isolation contrast test (CCT) and is built from the ground up with entirely new architecture. Highlights include:

  • Cone-Isolation contrast 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
    (Coming Soon!)
  • … and much more

FDA listed | CPT Code 92283 | CE | TGA | Health Canada

Clinical Benefits of Diagnostic Color Vision Testing

1 in 5 may have a color vision deficiencyTritan (S-cone or blue-yellow type) deficiencies are rarely genetic, yet may affect up to 15%* of the general population. Acquired deficiencies are commonly S-cone type, but may also affect L and M-cones. Acquired deficiencies are gender neutral and become more common with age.

This important but often overlooked clinical sign may be caused by retinal, optic nerve, trauma or neurological disorders, in addition to cataracts and high-risk meds, as well as hundreds of common drugs and substances**.

High-definition, cone-isolation contrast testing provides a detailed assessment (with a numeric score) of each cone-cell population.  The contrast “Threshold” scores as well as associated “Standard Error”, are useful to quantify performance as well as for assessing changes over time from acquired deficiencies that have been otherwise clinically missed entirely.

Testing for acquired color vision deficiencies may be one of the most underutilized measures of functional vision. Commonly used color vision tests (such as printed pseudo-isochromatic “Ishihara plates” designed a century ago), may only test genetic L and M-cone deficiencies, completely missing all S-cone (blue) 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-definition.

*Rayman, R., et al. Rayman’s Clinical Aviation Medicine. Castle Connelly. 2013.
**Fraunfelder, Fraunfelder, Chambers. Clinical Ocular Toxicology. Sanders Elsevier, 2008: 320. Clinical Ocular Toxicology, Substances and Pharmaceutical Agents that can Cause Color Vision Defects.

ColorDx PseudoIsochromatic Tests

classic test methods - printed and digital versions

ColorDx PIP Standard 24 (print)

This Standard 24 pseudo-isochromatic, or “PIP-24” test is a “confusion-color” printed test method. The Standard 24 test is designed primarily for detection of deficiencies most commonly attributed to heredity in a classic “hidden-number” format pioneered by Ishihara.  Limited availability while supplies last.

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ColorDx Extended 104 (digital)

The ColorDx Extended 104 test is a digital color vision test using a classic “PIP” or pseudo-isochromatic “confusion-color” strategy as originally pioneered by Ishihara. The Extended 104 test qualitatively classifies deficiencies as Deutan – Protan – Tritan as well as quantitatively as Mild – Moderate – Severe. The “D-15” color-ordering test (also a “confusion-color” strategy) and Pediatric 15 tests are included pre-installed on a Windows Surface 3 tablet, while supplies last.  Limited availability, call for details.