Question to the Department for Transport:

To ask the Secretary of State for Transport, pursuant to the Answer of 9 March 2026 to Question 116584 on Aviation: Colour Vision Deficiency, what independent analysis reported that only the CAD test and anomaloscopes when used correctly have 100% sensitivity and specificity when assessing colour vision.

The analysis in question is a paper from a French research group that was published in a peer reviewed journal in 2018. The reference is:

Marechal M, Delbarre M, Tesson J et al. Color vision tests in pilots’ medical assessments. Aerosp Med Hum Perform August 2018; 89(8): 737-743.