You can notice that in these boxes there are different named colors and they slightly change depending on which box you are looking at They try to represent, as close as possible, how color blind people depending on the type of colorblindness see the colors.
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How many color blind people are there? These types cause difficulty distinguishing between reds, greens and oranges and cause blues and yellows to stand out. Absent or weakened s-cones or shortwave cones is a condition called Tritanopia or Tritanomaly respectively.
Both are extrememly rare, affecting 1 in ,, and alter the ability to distinguish some blues from greens and some yellows from violet.
There are some who can not see any color at all—to them the world is a black and white movie. This is known as monochromacy or achromatopsia and is due to non-functioning or absent retinal cones. Achromatopsia is extremely rare occurring in approximately 1 out of 33, people. Color blindness is mostly inherited, though acquired color vision defects can be caused by some chronic illnesses, accidents, chemicals or medications.
There is currently no cure for color blindness, though there has been some progress with gene therapy in monkeys. If you think you may have some color vision deficiency, see your eye doctor.
He or she can give you the Ishihara Plate test , the one with all the colored dots, or use more sophisticated testing if needed to find out if you are indeed color blind. If this is the case, you may be able to see times more colors than the rest of us!
This is why color blindness tends to run in families. The most common types of color blindness in humans fall under the heading of anomalous trichromacy. People who are color blind can only see certain colors, depending on which type of color blindness they have.
The types of red-green color blindness fall into four different categories. Protanomaly aka red-weak — Individuals have red cones and can usually see some shades of red. Deuteranomaly aka green-weak — Individuals have green cones and can usually see some shades of green. Ultimately, the different types of red-green color blindness all result in the individual seeing a world the rest of us would describe as murky green with hints of blue and yellow.
Browns, oranges and reds are easily confused, and pale shades in general are difficult to distinguish. Blue-yellow color blindness is less common. The two types of color blindness in this category both make it difficult to tell the difference between blue and green, as well as yellow and red. There are two types of blue-yellow color blindness:.
Tritanopia aka blue-blind — Individuals have no blue cones. Tritanomaly aka blue-weak — Individuals have blue cones and can usually see some shades of blue. All six of these types of color blindness stem from one of the three cone types not functioning to some degree. Though people with anomalous trichromacy may have trouble selecting ripe fruit or reading traffic lights, most colorblind people adapt to live normal lives. Monochromacy, on the other hand, can be quite challenging. Achromatopsia occurs in only one in every 33, people.
People with monochromacy see no color at all. For these individuals, the world exists in black and white, much like an old-time television. The concomitant light sensitivity often transforms everyday tasks into difficult chores.
Individuals interested in learning more should visit AchromaCorp. Color blindness is not always inherited. It can be caused by environmental factors and can affect each eye individually to different degrees. The actual categorizations as outlined above are the same, but the foundational causes are quite different.
Some ways color blindness can be acquired are:. Age — A subtle blue-yellow color blindness can develop with age. Quite simply, the lens becomes less transparent, affecting how much light reaches the cones.
Alcohol consumption — Reduced color discrimination can be symptom of alcoholism, with blue-yellow being particularly affected. Brain trauma — Head injury or stroke can sometimes though rarely result in color blindness.
Environmental chemicals — Even at low levels, carbon disulphide and lead can cause color blindness. Most people who become colorblind as opposed to those who are born with the condition retain the ability to perceive some colors, but symptoms may vary over time, and in some cases the condition can progress into more serious types of color blindness, such as monochromatism.
The non-profit Colour Blind Awareness has compiled statistics on types of color blindness the world over. The most common types of color blindness are those in the red-green category. In the colorblind population, deuteranomalous or green-weak vision is by far the most prevalent.
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