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Color blindness for FAA Physical
I am curious what happens to someone who cannot pass the color blindness part of a Class III FAA physical.  I have perfect color vision, but was just curious. It seems that the color blindness test involves the ability to see light gun signals from the tower in event of a radio failure.  Is this really necessary these days? 
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The rotating beacom for land airports is white/green which is probably what they are worried about.  Again still rare that you would need to use it or distinguish it from other types of airports.
Yeah. I have the white/green problem. What's crazy is, the white light will never be used in the air. So when you are flying, you'll get either red or green. White is only used on ground. So at the most critical time, while in the pattern, you don't need to know white from green.
Just switched to Basic Med. Had the color vision limitation on my third class medical. Basic Med Doc never checked for color blindness or vision for that matter. So, do I still have the limitation? 
I can easily tell the difference between red and green.

I just have problems with some of those plates.

There is a condition where your cones (I forgot if it's the red or green sensor) are slightly different than normal.     I believe that's the condition I have.

There is a test where you arrange color dots so the the color gradually changes from one hue to another and is supposed to be harder than the Ishihara test.

Sort of like the "color arrangement test" here:    

I don't have any problem with that one ........ 
People who got a SODA before the newer tightened standards is lucky - it’s valid for life even if you wouldn’t be able to pas the test for one now.

Anyone who cant pass the standard Ishihara book should search for an AME or eye doctor with one or more of the other acceptable tests, which include Dvorine plates, AOA plates, Keystone Telebinocular vision tester, and the old standby Farnsworth lantern.

Its also worth asking tower controllers to shine the color light guns at you from across the airport, and have a friend or instructor quiz you on the colors on a Sectional chart. If you can see all those successfully, your very likely to pass the medical flight test. 
FAA instituted this stricter color vision policy because of the proliferation of colors on flat screen avionics and the need to distinguish between them. There was a Part 121 crash in Florida that the NTSB, rightly or wrongly, attributed to the pilot’s color deficiency.