ColorDx CCT HD is a new, high-precision, computer administered color vision diagnostic device developed under a Cooperative Research and Development Agreement (CRADA) between the US Air Force OBVA Laboratory and Konan Medical USA.
ColorDx CCT HD is based on the cone contrast isolation strategy, with many significant advantages over the original CCT test.
A rotated Landolt C is used to assess L (Red), M (Green) and S (Blue) cone cell function. The 4 response options are simply UP, DOWN, LEFT OR RIGHT.
|ColorDx CCT HD||CCT (Original)|
|Calibrated Color Display||Yes||?|
|Low Contrast Thresholds < 0.2%||Yes||No|
|High Definition/ Granularity Thresholds||Yes||No|
|Monocular and Binocular Testing||Yes||No|
|Fast Screening Threshold Option||Yes||Yes|
|Target Optotypes||Landolt C||?|
|User Interface||4 Button Response Pad||On-screen
Selected with Mouse/Keyboard
|Threshold Method||PSI Marginal Adaptive||Standard|
|Lowest Contrast Level||< 0.2%||1.6%|
|Response Time Reporting||Yes||Yes|
LogCS, Contrast Threshold
|0 - 100|
|Hardware Only Replacement/
|Regulatory||FDA Class I||?|