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ColorDx CCT-HD Cone-Isolation Contrast Sensitivity

military-grade color vision diagnostics

ColorDx® CCTHD®

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 Bayesian thresholding technique, "Psi-marginal Adaptive", 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 sensitivity methodology
  • "Landolt C" based test strategies
  • Simple to use 4-button response pad
  • Robust thresholding and derivation of statistic 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
Konan's CCT-HD is the world's first cone-isolation, contrast sensitivity test to be FDA listed and CE marked. CCT-HD is also listed with TGA, Health Canada, and now available in Japan.
Extended color vision diagnostics are listed as CPT Code 92283 in the US market.

Clinical Benefits of Diagnostic Color Vision Testing

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

This important but often overlooked clinical sign may be caused by retinal, macular, 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, individual, cone-cell population.  The contrast “Threshold” scores as well as associated “Standard Error”, may be particularly useful to quantify cone-contrast performance as well as for assessing changes over time from acquired deficiencies that may have been otherwise clinically been missed entirely.

Testing for acquired color vision deficiencies may be one of the most underutilized measures of functional vision. Commonly used color vision tests historically (such as printed pseudo-isochromatic, “Ishihara plates”, designed more than a century ago), may only test L and M-cone deficiencies, completely missing all S-cone (blue) deficiencies as well as being not quantitative. Genetic color vision deficiencies, most commonly affect males as a sex-linked trait and most commonly affect the L or M-cones.

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.

*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.