ColorDx® CCT HD®

High-Precision Diagnostic Color Vision Testing

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

Understanding if and how much visual function is affected may assist clinical decision making and augment conversations with your patients.

Clinical Applications

DR, glaucoma, AMD, MS

Other disorders of the retina or optic nerve

Pre and post cataract surgery

Vocational, avocational, and scholastic color
vision testing

Track the effect of supplements over time2

ColorDx is not cleared for the specific diagnosis of any condition
Clinical Benefits

Detect subtle changes missed by books, plates, and other color vision tests 

Compare structure & function, especially when subjective SAP does not correlate with OCT

Inform patients about the risks, consequences and hazards related to deficiencies in their cone and achromatic contrast sensitivity


FDA Listed | CPT Code 92283
 TGA Approved
Available in Canada

ColorDx CCT HD

The new gold standard in diagnostic color vision testing

Assess visual function beyond high-contrast acuity

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 original USAF cone-isolation contrast test (Rabin 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 Bayesian threshold with 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 

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Eye Care Beyond Black and White

Color Vision Changes in Macular Disease

Andrew Browne, MD PhD

Clinical Assistant Professor, Ophthalmology
Vitreoretinal Diseases and Surgery
Gavin Herbert Eye Institute, UC Irvine Health

Visual acuity measurement is the gold standard for evaluating visual function. However, contrast and color vision are largely neglected in clinical trials. In this presentation we will discuss changes in contrast and color vision associated with a variety of clinical disease states starting at the front of the eye and moving to the back.

Clinical Benefits of Diagnostic Color Vision Testing

1 in 5 may have a color vision deficiency. Contemporary 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
After using Konan's ColorDx CCT HD product in the clinic, I am painfully aware of the severe limitations and deficiencies of the legacy tests.
Time to pile all of the old pseudoisochromatic tests, and color testing books, along with the lanterns and 15-color chips into a big rubbish pile and set them on fire.
It is time for the professions to embrace a serious upgrade.
Paul A. Harris, OD
Professor, Southern College of Optometry

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

ColorDx CCT HD is the world’s first cone-isolation, contrast sensitivity test to be FDA listed and CE marked. CCT HD is available in Canada,  listed with TGA and in Japan, and applied for in Korea. Language localized instructions available in many countries.

ColorDx qualifies for CPT Code 92283 in the USA.

In the future, ECPs will move beyond testing only black and white visual sharpness and treat patients routinely to maintain their quality of color vision experience.
I use ColorDx CCT HD to assess and counsel patients with reduced contrast sensitivity as well as track progression.
Andrew Browne, MD, PhD

University of California, Irvine 
Gavin Herbert Eye Institute 
Department of Ophthalmology