The following are the requirements for the medical certification of aircrew, including guidance material issued by the UK CAA Medical
Department in relation to colour vision.
MED.B.075 Colour vision
(a) Applicants shall be required to demonstrate the ability to perceive readily the colours that are necessary for
the safe performance of duties.
Class 1 and 2
(a) At revalidation colour vision should be tested on clinical indication.
Colour Assessment and Diagnosis (CAD) test is required if there are any errors on the first 15 plates.
Part MED.A.010 defines colour safe as ‘the ability of an applicant to readily distinguish the colours used in air
navigation and correctly identify aviation coloured lights.
CAD tests should be conducted under CAA protocols (available on request). The CAD test will only pass as colour safe,
those individuals who perform as well as individuals with colour vision in the normal range on the most difficult aviation
colour vision tasks. See CAA papers:
For further reading, see CAP 1429 Analysis of European colour vision certification requirements for air traffic control officers.
(c) In the case of class 1 medical certificates, applicants shall have normal perception of colours or be colour safe.
Applicants who fail further colour perception testing shall be assessed as unfit. Applicants for a class 1 medical
certificate shall be referred to the licensing authority.
(c) Those failing the Ishihara test should be examined either by:
The UK CAA does not conduct lantern testing as servicing and output of the machines cannot be quality assured. If the
AMS is to consider the result of a lantern test, the report should include clear detail of the protocol used, responses
made and documentation of the calibration/maintenance of the equipment. Non-UK tests must have been conducted by an
Aeromedical Centre in another Competent Authority.
Class 1 applicants who fail advanced colour vision testing can request individual assessment by the Authority under
MED.B.001 (“issued by the Licensing Authority”) and consideration will be given to restriction of privileges to “valid by
day only” and “no public Commercial Air Transport” (VCL + SSL-ILA + SSL-NCAT).
(d) In the case of class 2 medical certificates, when the applicant does not have satisfactory perception of colours,
his/her flying privileges shall be limited to daytime only
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