Written Question·Department for Transport·UIN 118038
Colour Vision Deficiency: Medical Examinations
Tabled: 4 March 2026
Answered: 13 March 2026
Question
Joe Robertson
Conservative — Isle of Wight East
To ask the Secretary of State for Transport, if she will review the evidential basis for the Colour Assessment Diagnosis test.
Answer
Keir MatherThe UK Civil Aviation Authority (CAA) keeps the evidential basis for colour vision testing under regular review. The Colour Assessment and Diagnosis (CAD) test, developed with City University London, is currently the only advanced colour vision test accep...
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