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Medical Forum / General / Vision / April 2007Colour Blindness
After yet again being turnrd down for a job (this time, British Telecom), I thought I would post here. I have Protoanomalia (red-green colour blindness), and, athough I am quite capable of working with electricity, and/electronics, I am not allowed into the industry. Some years ago I wrote a short paper detailing, a method of more accurate diagnosis of Colour Blindness, and a possible cure. I forwarde the paper to Mrs Jennifer Birch (Senior Lecturer in Clinical Optometry, at City University, London), and whilst I was correct, about the more accurate diagnosis, my possible cure wouldnt have worked, since my knowlege of the dynamics involved was immature. Shortly after I came up with a new Idea, which is presented on the following web page, along with some initial experiments and research: http://www.fineartradiography.com/hobbies/colour/index.html I would very much like to hear from anyone who has an opinion, or constructive critisism, on my idea. Many thanks to everyone that read this Leslie Wright On Apr 23, 2:40 pm, lesliewrig...@hotmail.com wrote: > After yet again being turnrd down for a job (this time, British > Telecom), I thought I would post here. [quoted text clipped - 21 lines] > > Leslie Why will dyeing an internal eye structure (vitreous) reduce the "3 D" effect caused by an external (contact) lens? > On Apr 23, 2:40 pm, lesliewrig...@hotmail.com wrote: > [quoted text clipped - 26 lines] > Why will dyeing an internal eye structure (vitreous) reduce the "3 D" > effect caused by an external (contact) lens? Obviously, you would want to dye both. I should have been clearer in the explanation! The point is dyeing the vitreous humour would be a (semi) permanent solution, that companies like BT could not ignore. Granted you would probably have to have regular checkups, depending on the rate of the bodies excretion of the dye, but then you should be seeng the opthalmolgist on a regular basis anyway. I do not know, why the ChromaGen lens, only uses one eye (given the chromatic binocular disparity it creates) But with the results of the experiments, I feel that this would work woith both eyes, thus negating that effect, and be an almost permanent solution. Leslie > > > I have Protoanomalia (red-green colour blindness), and, athough I am > > > quite capable of working with electricity, and/electronics, I am not > > > allowed into the industry. > I do not know, why the ChromaGen lens, only uses one eye (given the > chromatic binocular disparity it creates) The Chroma Gens works by "fooling" the plate type tests. Wearers still fail on more precise colour vision tests. Some users of the lens have found that by comparing the view through the lens with the view without (ie compare one eye to the other) they are better able to colour name. Also the Chroma Gens lens (and your proposed filters) remove a significant amount of light so things are dim. Driving at night with two Chroma Gens would be difficult. > But with the results of the experiments, I feel that this would work > woith both eyes, thus negating that effect, and be an almost permanent > solution. If you are actually able to do the jobs you have applied for, despite the colour defect, you may get further by lobbying the employers to use real world testing instead of relying on colour vision test plates. Here in Canada, the railroads, police forces and even pilot licensing bodies will use real world testing. For example, railroad workers take a Lantern Test, which involves shining small, dim, coloured lights from a distance and testing whether the individual can identify them. Pilots are taken to the flight control tower at night and tested to see if they can identify the ground lights. Seems if you were applying for electrical engineering, they could have provided you with the twenty or thirty different coloured wires used in electronics and tested whether you could identify them and not confuse any two. Dr Judy > > > > I have Protoanomalia (red-green colour blindness), and, athough I am > > > > quite capable of working with electricity, and/electronics, I am not [quoted text clipped - 30 lines] > > Dr Judy I have tried on several occasions arguing my case with these people, but it seem somewhere in the manual of theirs, it says Colour Blindness=no job! I managed to convince the local college lecturer to give me a real world test, an whilst I passed it, I was informed that the Law states that you are not allowed to enter the industry as you are colour blind. There is a local Election coming up, so I am going to put my case across to the candidates, and vote for the one, who offers to take it further. Mr Harris`s ChromaGen lens, did indeed remove a significant portion of the available light, and did cause innacuracies in colour perception, whilst being able to fool the Ishahara test. However, I feel that with more accurate measuring of the degree of colour vision deficiency, and dyes being mixed, on a more individual basis, that it would be possible to produce more acceptable results. Regarding the dimness of the percieved scene, there are dyes available, and dyes can be engineered with, very narrow absorption peaks, if dyes such as these were used, the total light reaching the retina, would only be reduced by around 2 or 3%. In the ChromaGen lens, the light reaching the retina was reduced (depending on filter) by approx 30%, as the dyes used in the filter were quite broadband in their absorption characteristics. Leslie lesliewrig...@hotmail.com wrote: > After yet again being turnrd down for a job (this time, British > Telecom), I thought I would post here. Sorry to hear you were turned down. I am not colour-blind at all, but found your link interesting--you have certainly put much time into researching a solution. Your color-filter seemed to have worked well and could lead to a real product in the future that could help many people. I understand your frustration, but I don't think you should be considering injecting any dye in your vitreous or cornea--that's really a radical approach. A side note: I once read a book written by an ophthalmologist (sorry I don't remember the name) who discussed some possible genetic reasons for color-blindness---that I found fascinating. He said that it is more common in people of European origin (western Europe), and that it could have been an evolutionary adaptation originating during the time of the last Ice Age. His theory held that people spent much more time inside, doing tasks by firelight, and that color-blindness is an advantage in these low and yellow-spectrum light conditions. It allows people to see much more detail, and could have increased the ability to do tasks involving fine detail (sewing, tool-making, etc), and thus would have given them a competitive advantage toward survival in harsh conditions. C On 24 Apr, 00:46, callimic...@yahoo.com wrote: > lesliewrig...@hotmail.com wrote: > > After yet again being turnrd down for a job (this time, British [quoted text clipped - 24 lines] > > C I`m sure that people once considered laser ablating the cornea a radical approach to eyesight correction, though it is now common place (Lasik), but sometimes a radical approach is needed for certain problems. I read a similar text about the evolutionary advantages of colour blindness, and as well as the low light capability, you mention, it also suggested that early colour defficient man, was more easily able to spot camoflaged prey, also giving an advantage. I have heard rumours of the Armed forces employing red-green colour blind people for this reason! Leslie the evolutionary advantages of colour > blindness, and as well as the low light capability, you mention, it > also suggested that early colour defficient man, was more easily able > to spot camoflaged prey, also giving an advantage. > I have heard rumours of the Armed forces employing red-green colour > blind people for this reason! I had not heard about these other theories. In my original reply to you, I was responding to your way of thinking: That colour-blindness can be "cured" as though it were a disease. For me, thinking of it as an evolutionary adaptation is a more positive view. In that view, there is nothing "wrong" with you. I would think that within the field of electronic engineering there is work that does not require precise color-matching, and if you are qualified in other skills (which seems likely) then you will eventually find work doing what you like. Gook luck, and keep working on the color-correcting lens research. There will be far quicker acceptance of a product than there will be of any invasive or surgical procedure. C66 On 4/23/07 11:40 AM, in article 1177353622.813256.99160@l77g2000hsb.googlegroups.com, > After yet again being turnrd down for a job (this time, British > Telecom), I thought I would post here. [quoted text clipped - 21 lines] > > Leslie Wright I presume that you were rejected because you might have to read color codes on resistors and cable conductors. Please let us know why you cannot do the work that would be required of you. Rather than trying to figure out how to change your vision to solve the problems, consider inventing something that will read the color code so that you will not need to perceive them. This will be complicated because I have notice that the colors on resistors easily obtained vary. The modern glassy covered colors on 1/10 watt resistors that are common now are very different from the bakelite covered composition resistors (1/4, 1/2, 1/2, 1, and 2W) resistors of yesteryear. Bill -- Fermez le Bush--about two years to go. > I presume that you were rejected because you might have to read color codes > on resistors and cable conductors. Please let us know why you cannot do the > work that would be required of you. I can do the work. Some crackpot behind a desk deceded it was illegal, or too much of a risk etc > Rather than trying to figure out how to change your vision to solve the > problems, consider inventing something that will read the color code so that [quoted text clipped - 3 lines] > from the bakelite covered composition resistors (1/4, 1/2, 1/2, 1, and 2W) > resistors of yesteryear. I use a mutimeter! However I did once build an RGB LED "light", to illuminate the resistor. By adjusting the values of RGB, I can read the codes, in my case it is a slight red bias. |
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