Colorblind testing

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kwired said:
A little strange your wife has it, I always heard that women just don't get color blindness very often, something to do with male/female determining components of genetics makes it rare.
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You are correct, it is rare among women (~0.5%, vs 8% for men), but my FIL is colorblind and my MIL's brother is color blind and she is a carrier. All of my wife's sons will be color blind, but if we had any daughters, they would all be carriers but not color blind themselves. Interestingly, blue-yellow color blindness has the same frequency (~1%) in men and women as it is not sex linked.
 
kwired said:
A little strange your wife has it, I always heard that women just don't get color blindness very often, something to do with male/female determining components of genetics makes it rare.
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It has to do with women having a spare X-chromosome, and men having only one. Colorblindness is recessive, and is carried on this chromosome. Women need to inherit it from both parents, while men can inherit it from just a mother (who may not know she is a carrier).

There are Klinefelter men (XXY) and Turner (X0)/Swyer (XY-) women, who are exceptions to this rule of inheriting sex-linked traits.
 
I’m blue/yellow colorblind. It can make work difficult at times. I use an app on my phone called “binoculars” that works pretty well.

For new work the spools are labeled so not really a big deal.

LV termination is where I struggle most; some brands of cable are extremely close in color on their blue & green. I’ll usually text a picture to someone and ask if I’m really struggling. I’ve miswired many RJ45 keystones.

As for testing, my DOT physical requires it. I failed the first time; nurse helped me out. Now at least I know what they’re asking for.


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Worked as a nuclear startup tech for a couple of years with another older electrician.....we had to verify wiring so we had battery phones to allow continuity tests. I was on green to ground and my partner was to be on green to ground on the other end of the cable.....no comms. I went to the other end (quite a long climb) and there he was....red to ground. He faked the test which we were given when hired and never told anyone. We had to redo dozens of tests and actually found zero errors (no, I didn't rat him out...he failed a test the next year). I asked him how he did it and he said it was probably a lucky guess each time...amazing but true (sounds like a TV show)!! Annual test for us.....
 
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brantmacga said:
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for testing, my DOT physical requires it....
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Since my employer sold the high-lift bucket truck (affectionately known as Rodan), I've kept my CDL for personal use only (P18). This restriction allows me to keep the CDL without paying for an annual "med-cert".

The "med-cert" physical is a fairly strange set of exams that I cannot reconcile with operating a large truck. Only the bizarre exams stay in my memory, and I honestly can't recall if the colorblind test is among them.
 
I was splicing fiber optic today, small 250 uM fibers with colors that are hard to discern. I use a light with a magnifying lens, even outside. Orange and brown are close in shade.
Our states signals are vertical, so no issue there. I saw a signal head in Georgia in the late 60s' that was 2 section, opposite green was red, so the could use 2 lamps. No yellow.
And a few years ago I met a person who collected signal heads and he had one! so I remembered it correctly
 
tom baker said:
I was splicing fiber optic today, small 250 uM fibers with colors that are hard to discern. I use a light with a magnifying lens, even outside. Orange and brown are close in shade.
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The orange/white and brown/white conductors in CAT-5 cable are hard for me to tell apart, and I'm not color blind.
 
Speaking of color. to me, the worst is trying to tell the difference between 6ga and 8ga NM.
 
jeremysterling said:
The "med-cert" physical is a fairly strange set of exams that I cannot reconcile with operating a large truck. Only the bizarre exams stay in my memory, and I honestly can't recall if the colorblind test is among them.
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My understanding is that it’s to make sure you’re not at risk of a heart attack or stroke behind the wheel.

Mine is bi-annual, but I know guys on blood pressure meds that have to take it every year.

I don’t actually have a CDL though; our truck is an International 4200 rated at 24,999 lbs.
 
brantmacga said:
My understanding is that it’s to make sure you’re not at risk of a heart attack or stroke behind the wheel.

Mine is bi-annual, but I know guys on blood pressure meds that have to take it every year.

I don’t actually have a CDL though; our truck is an International 4200 rated at 24,999 lbs.
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Yeah, I guess I could see someone prone to heart-failure stroking out when then nurse whispers at your ear right before the doc squeezes your testicles. I told the doc, "I only have to drive the truck, not carry it up the stairs."

The test I take is good for two years as well. I don't have a combo lic. I do have a class B w/ air brake endorsement.

For the OP: Today, I asked my apprentice if he was colorblind. He said no. I held up a piece of green building wire and said what color is this. He passed.
 
jeremysterling said:
Yeah, I guess I could see someone prone to heart-failure stroking out when then nurse whispers at your ear right before the doc squeezes your testicles. I told the doc, "I only have to drive the truck, not carry it up the stairs."

The test I take is good for two years as well. I don't have a combo lic. I do have a class B w/ air brake endorsement.

For the OP: Today, I asked my apprentice if he was colorblind. He said no. I held up a piece of green building wire and said what color is this. He passed.
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You killed your apprentice with a piece of wire???? :D
 
infinity said:
I was tested once, it was prior to entering the apprenticeship program. That was 32 years ago.
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yeah. same here. to the best of my knowledge,
there is no adult onset colorblindness.

i have a half brother who is colorblind. where
it screws him badly is where they decide to put
the traffic signals sideways.

right now, i'm in raton, nm. they have sideways signals.

now, 20 miles up the road is trinidad, colorado, the
loco weed capitol of colorado. they sell just shy of
$1,000,000 a *week* of cannibis, in a town of 9,000.

it doesn't matter how the signals are there. everyone i'm
suspecting is seeing round out of one eye, and square
out of the other.
 
gadfly56 said:
You may have seen an episode of Dr Oz back in January where they showcased the Enchroma glasses which can help color blind individuals more clearly see colors. My wife and sons were participants in that segment.
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there are a number of problems, ranging from reading
difficulty to adhd, autism, and concussive brain injury
with vetrans, that can be affected by the color of the
light you are viewing stuff in.

it's called the irlin syndrome, and the lady who developed
the treatment is helen irlin, who has offices half an hour
from my house, so i went in and got tested.

it's not a black and white result (bad pun) but a gradient,
and i tested high enough on the scale to make it worth
having a pair of tinted lenses made up to see if it improves
reading and whatnot.

i'll let you know how it turns out.

https://irlen.com
 
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