NEO RS214
going into such investment to devise another test along purely academic lines was a really poor (and excruciatingly unfair) decision.
Absolutely agree with 2 close comments and above comment but what a pity that CAA didn't actually follow standard academic practices properly.
Any academic would start from a logical basis of studying the actual real world risk and quantify it first. Not merely devise lovely computer programme to replace a very reliable Ishihara test book. Lets get to the root of the issue not merely the symptoms.
We know we have CVD but we disagree that we are unable to safely fly an aircraft.