HC Deb 16 December 1912 vol 45 c1087
44. Mr. PETO

asked the First Lord of the Admiralty at what period are the tests in colour and form vision applied to executive officers in the Royal Navy; whether these tests must be undergone on entering the service; and whether once an officer has shown proficiency in these tests they are no further applied?

The FIRST LORD of the ADMIRALTY (Mr. Churchill)

These tests have to be undergone on first entry into the service. They are further applied to officers who go through courses in the navigation school, and also to officers as to whose colour perception any doubt may arise.