ColorDx® CCT HD®

Color vision and contrast sensitivity are important functions of the visual system, which may be affected by many diseases, disorders and common substances.

Understanding if, and how much these functions are affected, may assist clinical decision making and help doctors educate patients about the risks and consequences of their condition.

ColorDx® CCT HD®

ColorDx CCT HD represents the new gold standard for color vision diagnostics.

Developed in collaboration with the U.S. Air Force School of Aerospace Medicine OBVA (Operational Based Vision Assessment) laboratory under CRADA, CCT HD expands on the strengths of the USAF cone-isolation contrast test (CCT) and is built from the ground up with entirely new architecture.

Highlights include:

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

Clinical Benefits of Diagnostic Color Vision Testing

1 in 5 may have a color vision deficiencyContemporary eye care includes qualitative and quantitative assessment of this important measure of visual function.

Acquired 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**.

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.

*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.

Required high-precision color-rendering display in two convenient hardware options

convertible tablet and all-in-one PC, each with matte screen, calibration hardware and custom 4-button response pad

High-precision color diagnostics require high-precision calibration for highest sensitivity.

Custom-Precision Calibration

ColorDx CCT HD devices are individually, precision calibrated at manufacturing prior to customer shipment.

Konan’s proprietary deep, synchronous calibration provides a high-precision baseline from which periodic verifications / calibrations are based to account for typical monitor color changes over time. CCT HD includes a USB colorimeter for routine calibrations, typically taking only about a minute.

Regulatory Compliance Around the World

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 Japan and applied for in Korea. Language localized instructions available in many countries.

Extended color vision diagnostics are listed as CPT Code 92283 in the US market.



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