Colour Vision Assessment (including CAD and additional tests)

As part of the Colour Vision Assessment, the CAD test employs a new approach to colour vision assessment by completely isolating the use of colour signals in the eye so that it can accurately detect both congenital and acquired colour deficiency, your class of colour vision, so whether you have normal trichromatic vision, deutan-, protan- or tritan- like deficiency or an acquired loss of chromatic sensitivity, and the severity of any colour vision loss.

What is unique about CAD?

Its 100% sensitivity allows the CAD test to pick up on very low level colour deficiencies which other tests may pass by unnoticed and means that even if your results show some level of colour deficiency you may still be able to take on jobs where colour sensitivity is vital.

Who can benefit from it?

The CAD test includes clear certification limits for pilots and air traffic controllers, as well as age corrected ‘normal’ ranges from 6 to 85 years.

Other relevant tests

Although the CAD test is a sufficient assessment of colour vision on its own, the full colour vision assessment includes a range of other more familiar tests to confirm results with increased specificity and indication of the extent of any damage caused by disease.

These tests include Ishihara, D15, Holmes-Wright Lantern (type A and B) and AS-HRR Plates.

Having completed these tests, you may also be referred to or choose to take the PAPI or CRATO tests.