Eagle (envoy) used to have a full medical exam done in house, but when I was hired in 2011, they had reduced it to a hearing test, eye test, and drug test. No test for color deficiency.
Does anyone know if Spirit requires one? The only thing I worry about is the color deficiency test. On my initial medical, I couldn't pass the Ishihara test for color deficiency, so I had to jump through some hoops to take the Farnsworth Lantern Test. I haven't had any troubles with it since. I just hope my next airline doesn't do the plates test, because I'm not sure they would want to go through the trouble to get me the Lantern test.