"J. Severyn" wrote in message
...
It looks like UK pilots who fail the Ishihara test have the Holmes-Wright
lantern test as a fallback. Check out
http://www.optometry.co.uk/articles/...04/Chorley.pdf

The CAA's documentation has historically been slightly confusing on the
matter. The only stuff I found on their Web site when I looked related to
Class 1 medicals - the Holmes Wright was not mentioned at all for Class 2
(PPL) medicals. However, the documentation that the CAA sends to AMEs does
state (according to my AME) that a Class 2 medical certificate holder can
have his colour-vision-induced restriction (which basically states that you
may fly by day only, and which is inflicted if you fail the Ishihara Plates
test) lifted by passing the HW lantern test.

D.