Doctor insights on:
Red Blue Color Blindness
There is none: You can have colour blindness when you see red as black, but not black as red. ...Read more
Ophthalmologist prefer to use the term color deficit as blindness conveys other meanings. Lowered color perception can be inherited (many forms), can result from advanced loss of retinal cells, inherited retinal disease, and some forms occur due to CNS injury. There are excellent tests for the various types and they can be functionally ...Read more
Somewhat: The colors in color deficiencies lose their distinctive character (technically become desaturated) so that distinctions are blurred and many greens and reds in the most common form become poorly distinct. The actual color is not know as this is a psychological phenomenon and the color deficient identify many colors the same that a 'normal' would call distinct. ...Read more
Varies: In red-green color deficiency there is a shift in the perceived spectrum of colors and some reds and greens appear the same while others can be distinguished. A more common form which is a deficiency instead of absolute blindness causes a saturation shift in perception of colors but a full palette of colors is possible with mistakes made in some recognition. ...Read more
I took ishihara plate test on internet and it shows that I have red color blind (protanopia). What can cause it, and what can be done about it?
Color vision is controlled by a gene on the x-chromosome. Females xx and males xy, making males more likely to be color blind.
Of the different types, red/green is the most common, with red being a sub-type of this.
You should see an ophthalmologist for an evaluation. If you are just now discovering this, it seems like you are pretty well adapted to your situation. ...Read more
If a color blind person is red-green color blind, can they still see most shades of those colors normally?
Altered perception: They will see shades of color in all colored objects but will but see the full range, so colors that might appear bright to you will seem attenuated to the color deficient and some colors will seem what you might term brownish. The mixture seen depends upon the depth of the color blindness in each individual. Because of this most color deficient persons adopt rather bland wardrobes. ...Read more
Can you advise for bio question- a mother has red-green color blindness. Her husband is not affected.?
Inheritance: For a woman to have red-green color deficiency she has inherited an defective gene both of her parents. This means all of her children will carry the defective gene. If her husband is normal then only the mother can pass on the trait. So: all of their sons will be color deficient and all of their daughters will be a carrier with one normal (from DAD) and one abnormal (MOM). ...Read more
Nearsightedness is a recessive trait. Red-green color blindness is a sex-linked recessive trait, what does this mean?
An Autosomal: Recessive disorder: Both parents are unaffected carriers of a mutant gene. Each of their children has a 25% chance of inheriting the mutant gene from both & having the disorder. X-linked recessive: Mom carries a defective gene on one of her X chromosomes. Each son has a 50% chance of inheriting the X chromosome with the mutant gene & having the disorder; each daughter, 50% of being a carrier. ...Read more
Red-green color blindness is caused by an x-linked recessive gene. In a family, the mother is a carrier of this gene while the father does not have the gene. What are the possible effects on their children?
Odds:: Half of the daughters will be carriers and half of the sons will be color blind. ...Read more
Not likely: Most color blind people have trouble with reds and greens. If you had blue-yellow colorblindness (rare), you would see gray instead of blue. You likely just perceive colors a little different than someone else. Colorblind people cannot distinguish certain colors at all. For example, they see no difference between green and brown. ...Read more
There are two situations in which the blue sensitive cones do not work properly dichromacy is the most severe with complete loss of blue perception.
Tritanopia (blue deficient: s cone absent)
tritanomaly (blue deficient: s cone defect)
the most common color deficiency is red–green (overall) 7 to 10% of the male population. ...Read more
Color blindness: Color blindness and the related visual perceptions vary significantly. I would recommend seeing an eye doctor and performing the ishiahara color plates and farnsworth testing to determine your exact deficit. ...Read more
Does a person’s eye color have any relation to color blindness? My boyfriend has blue eyes and is colorblind. A friend was telling me that having blue eyes makes you more likely to have color blindness. Is this true?
About 8%: The standard statistics for inherited color deficiency is about 7.5% in males and 1/2 % in females. This can vary somewhat with different racial groups. The degree of color deficiency and the type are variable so your ophthalmologist can test you and see in which category you are if that is important to you and also give you information about your family possibilities. ...Read more
Testing device: These are a group of color vision recognition and confusion plates, discs and lights to determine the degree and type of color deficiency that is present in a test subject. Some are standard in ophthalmologists office and others are in laboratories. And some are available on line for anyone to test themselves. ...Read more
Mostly inherited: The most common forms of color blindness are inherited. They are that way from birth. Less common is developmental such as advanced diabetic retinal disease which fades out color recognition. Retinal degeneration like retinitis pigmentosa lead to color blindness and there is a rare form of stroke which can cause cortical color blindness. ...Read more
No cure: Most color blindness comes from a genetic alteration in your light receptive pigments in the retina. This cannot be altered by current knowledge and technology. If you are 45 years, you probably will have adapted by now and chosen an occupation in which color recognition is not critical. ...Read more
Are you female?: Color deficiency is most common in males as it is carried on the X chromosome. Your brother has an equal chance of getting one or the other X from your Mom and one of these had the deficient gene. If you are male, then you got the other one. If you are female then you might have one deficient X gene but your other, from your father, is normal. ...Read more
Almost anything: Being colorblind should not limit a person much in life - even some famous artists have been colorblind! The only restriction I can think of is that colorblind people are not allowed to get a commercial driver's license, so cannot become a professional trucker, but otherwise colorblind people can usually learn to recognize traffic light signals and drive a car without difficulty. ...Read more
If color normal: The tests are designed with little dots that are shaded along the axes of confusion for the color deficient. A color normal will see the indicated symbol or number while the deficient will miss it. ...Read more
Not too bad: Many color deficient persons never know about it. There are a few occupational limitations such as paint matching, artistry, printing, and fruit and vegetable grading to name a few. Some occupations such as certain police jobs, pilots and commercial ship skippers require color normality. Most occupations do not require this and color deficiency is not a handicap. ...Read more
Psychometric testing: Psychologists have devised testing using an animal preference choice to determine which colors they can discrimminate. They can also observe the colored light absorption by individual photoreceptors with highly sophisticated laboratory apparatus. So we now have a good idea of the color perception (or lack of perception) of most major animal groups. ...Read more
Apparently normal: The color blind see well and though they might make mistakes in color recognition that a color normal would not, they see everything out there as normal to them and few have any difficulty. ...Read more
Color perception low: Ophthalmologist prefer to use the term color deficit as blindness conveys other meanings. Lowered color perception can be inherited (many forms), can result from advanced loss of retinal cells, inherited retinal disease, and some forms occur due to CNS injury. There are excellent tests for the various types and they can be functionally significant and affect employment. ...Read more
Testing: You can compare your color perception with someone known to be color normal. An ophthalmologist has available color perception test booklets to determine whether it is present, and what spectrum the deficiency lies within. This is important for certain occupations. ...Read more
It's in the genes: Color blindness is a genetic mutation that causes the receptors in the film layer of the eye (retina) to be unable to differentiate certain colors (blue, green etc.). There are several different forms of color blindness, related to the different mutations that can arise. Since most of us do not get the mutation, we have "normal" color perception. ...Read more
No: Color deficiency is an internal perception of the person with the problem. The external appearance of the face and eyes will not clue you to that deficiency. ...Read more
Vision impairment and blindness are conditions in which a person cannot see well or see at all, even with glasses or contact lenses. If a person's best vision (with correction) out of either eye is only 20/70 - 20/200, he is impaired. If he can see no better than 20/200 or his visual field is no more than 20 degrees (severe "tunnel" vision), ...Read more
Loss of vision reflects the inability to perceive images. Such a phenotype can be due to occlusive or barriers to light (e.g. cataracts) through retinal alterations (e.g. wet macular degeneration) to optic nerve lesions (e.g. from a pituitary adenoma) to central nervous system ...Read more