Latest on colour blindness testing

[glasgowniteowl]

It seems odd that train driver candidates can presumably meet medical standards with yellow-blue colour blindness, but that's another story!

It is not odd, being able to discern the difference between red and green is absolutely critical for a driver, simply one means stop the other means proceed, where as a blue yellow deficit is not safety critical, ie does it appear to the driver as one or two yellows on the signal, or one or two blues on the signal, regardless of how the individual views it both of which are a proceed aspect, there is no safety situation where its absolutely critical for driver to differentiate between yellow and blue, for yellow/blue its simply a case of is the light on or off? Which is not the case in red or green

 

[Class2ldn]

So the train company are going to go through more expense because someone says they've passed a different colour blind test?
The ishara test is relevant for the job we do, it tests our ability to see red and green which is vital for our job.
If you can't pass it you wont proceed further.
Forget what the rssb say, they don't do the medicals, the train companies do and its their medical staff that decide what happens.

 

[Av80r]

It is not odd, being able to discern the difference between red and green is absolutely critical for a driver, simply one means stop the other means proceed, where as a blue yellow deficit is not safety critical, ie does it appear to the driver as one or two yellows on the signal, or one or two blues on the signal, regardless of how the individual views it both of which are a proceed aspect, there is no safety situation where its absolutely critical for driver to differentiate between yellow and blue, for yellow/blue its simply a case of is the light on or off? Which is not the case in red or green

Interesting, thanks for clarifying that.

So the train company are going to go through more expense because someone says they've passed a different colour blind test?
The ishara test is relevant for the job we do, it tests our ability to see red and green which is vital for our job.
If you can't pass it you wont proceed further.
Forget what the rssb say, they don't do the medicals, the train companies do and its their medical staff that decide what happens.

It probably isn't any more expensive, the medical I did with one of the TOCs in an engineering role had CUT and Ishihara on the desk, they did CUT for me as the role had zero tolerance for any type of colour vision defect. CUT is pretty much the same as Ishihara (you used to have to do it at a London uni but now it is sold publicly) in the sense that you look at 20 odd pictures with funny dots. Presumably the company appointed doctor who did my medical also does their train drivers medicals, so has Ishihara and CUT to hand.