From what I understand, most railroads use the Ishihara test to check for color blindness…
I found a few sites on the internet that had a sample of the test, and I didn’t pass a single one of them… I suppose I won’t bother trying out, I never realized I had a color blindess problem before I tried these sites.
My mom and dad both got all the tests right so I seem to be the exception in the family…
Just curious how many of you out there can figure them out and see the numbers, the only ones I could see on the link below were the 25 and 56.
— Keep in mind these aren’t medically binding, they all say to check with a professional if you really want to know.
I am about 20/500 uncorrected with incipient fundus changes from myopia, and I see all the numbers quite clearly.
However, BE SURE your computer monitor is set up 100% correctly before you start worrying about congenital red/green blindness. You do know the difference between red and green signal lights without having to rely on their position in the head, right?
There are some good utilities out there for ensuring that everything is set correctly, including those that are designed to ‘match’ graphic images with their printed counterparts. A few of the high-end graphics-card and computer manufacturers actually provide the little on-screen sample matching cards or filters along with the software.
Conversely, almost any ophthalmologist would be glad to give you a gratis look at a printed Ishihara test, or at one of the other kinds of color-anomaly diagnostic test. I had a number of these (my grandfather being an EENT and my father the vice-chairman of ophthalmology at New York Hospital) but they’re buried in a sea of boxes from multiple moves!
If your mother was colour blind you will be too . Missing chromosone causes it and is transferred to children from the mother, tried the test back in England when I was 15yrs old - failed , that put paid to my hopes of becoming a railroad fireman then a driver . You just have to go with what you are dealt with . Just make sure you know when your partner has changed her hair colour – lie if you have to!!!
Saw them all. I don’t have as bad of vision as Overmod, but not great either. 20/200 in the left with really bad astigmatism and 20/30 in the right with regular astigmatism. You can probably still have 20/10 vision and have red/green color blindness, so don’t suppose it should be based on that anyway.
Apparently the quality of your vision has no effect on color blindness.
You can be 20/20 all round and still be color blind…
athelney, from what I understand it is always the mother who carries the genes determining color blindness in the child, but the mother apprently doesn’t have to be color blind to pass it on…
Depending on what stats you believe, approx 10 - 15% of white males are color blind, and only about a half of a percent of white females are color blind.
Right, I suppose if your mom was, then it would be a guarantee that you would be, however if your mom isn’t that no guarantee that you won’t be… (in my case).
Yeah, color blindness and visual acuity are two very separate, very unrelated things. I wasn’t trying to equate them, just humorously comment on the fact that I’m relatively unable to distinguihe numbers in these tests due to BLUR even though I can distinguihe spot colors just fine.
As pointed out by the examples, R-G blindness is sex-linked, which accounts for the differential between incidence in men and women. It’s possible that there are ranges of severity, or differential dysfunction in post-retinal signal processing (as opposed to deficit of some of the cone-cell functions per se), which would produce apparent color-blindness from some of the Ishihara tests while allowing perfectly good resolution of high-intensity red light from green light.
Yeah, that seems to be what caught me off guard, I never had the slightest idea that I may have some degree of color blindness until I checked out this test…
I have never had trouble with traffic lights and passed the test for my drivers license no prob, red, green yellow but I failed this test with (a lack thereof) of flying colors. [B)]
I’m afraid there is nothing to figure out, you either see the numbers or you don’t. That’s the point. This is not an ambiguous or subjective test. Color blindness has nothing to do with your ability to see in general, it only deals with your ability to recognize colors compared to what is considered normal.
I have known a number of people who are color blind, I am not. That has always left me wondering what they see when the light turns green. My ex father in law is color blind and he drove trucks for a living. Proof that color blind people can cope with the problem, just not as railroad engineers.
I’m 20/200 with corrective lens.I had to take the color blindness test every year,
while I was on flight status with the Nat. Guard.
I don’t know what I am now,as I had to have eye surgery last year.[:)]
I had to have implants in both eyes,as I was going blind,from cataracts.
The biggest problem for me is red signals ( road or rail) - They don’t stand out until I’m almost on them – worse if you drive in a strange town with many neon signs - My wife normally drives in strange towns or cities – If I do have to go there I watch the sequences ahead of me and am prepared to stop at short notice – just adapting to the situation …
Did work for the CPR in Coquitlam yard doing box car checking for a while – never did have an eyesite test !! They never asked me if I was colour blind either!!!