Color blindness and color weakness test – Color blindness and color weakness self-test chart

Color blindness and color weakness detection

Color blindness is a congenital color vision disorder. There are many types of color vision impairment, the most common being red-green color blindness. According to the theory of three primary colors, any color within the visible spectrum can be composed of red, green and blue. If you can recognize the three primary colors, you are considered normal. If you cannot recognize the three primary colors, you are called total color blindness. People with reduced ability to identify any color are called color weakness, mainly red weakness, green weakness, and blue-yellow weakness. If one of the primary colors cannot be distinguished, it is called dichromatism, mainly protanopia and deuteranopia.

Some are given below, I hope you can check it out for yourself. If you are unfortunately tested for color blindness or color weakness, I hope you will not be sad. It is determined by genetics. You can further determine the type of color weakness through the following. Color discrimination ability.

The patient's lack of color vision or incomplete color vision is called color blindness, and the low ability to distinguish colors is called color weakness. The male color blindness rate in China: 4.71+-0.074%; the female color blindness rate: 0.67+-0.036%; the frequency of color blindness gene carriers: 8.98%, mostly caused by inheritance. Want to know if you are color blind (color weak)? Below are some more representative color blindness detection pictures. Try to read all the pictures to see if the final detection results are the same. If the test is for color weakness, it will not actually have any impact on your daily life. You will only find color vision abnormalities when looking at some pictures that require relatively high color accuracy.

上图中的A读不出为红色色盲。
in the picture above A Can't pronounce it as red color blindness.
上图中的C读不出来是绿色色盲。
in the picture above C Not being able to read is green color blindness.
上图,红绿色盲者中的红色盲者只能找到紫色的线,而绿色盲者只能找到红色的线,但红绿色弱者、正常者则两线都找得到。
In the picture above, among the red-green blind people, the protan-blind can only find the purple line, and the green-blind people can only find the red line, but the red-green and normal people can find both lines.
上图,红绿色盲者中的红色盲者能读出6,而绿色盲者能读出2,但红绿色弱者及正常者则两个字都能读出来。
In the picture above, the red-green blind person among the red-green blind people can read 6, while the green-blind person can read 2, but the red-green person with weak color and the normal person can read both characters.
上图,正常看应是一幅“牛”的图案,如看到的是一头“鹿”,就有可能是色盲或色弱。
The picture above should normally look like a "cow" pattern. If you see a "deer", you may be color blind or color weak.
上图,正常者能读出6,红绿色盲者及红绿色弱者读成 5,而全色弱者则全然读不出上述的两个字。
In the picture above, a normal person can read 6, a person with red-green color blindness and a person with red-green weakness can read 5, and a person with full-color weakness cannot read the above two words at all.
上图,红绿色盲者及红绿色弱者大多能读成5,但全色弱者及正常者则大多都读不出来。
In the picture above, most people with red-green blindness and people with red-green weakness can read 5, but most people with color blindness and normal people cannot read it.
上图,红绿色盲者及红绿色弱者容易找到,但正常者及全色弱者大多却找不到。
In the picture above, people with red-green color blindness and people with red-green color weakness are easy to find, but most normal people and people with color weakness cannot be found.

What is color blindness?

Color blindness is a congenital color vision disorder, which refers to the lack or complete inability to distinguish colors. There are many types of color blindness, the most common being red-green color blindness. According to the theory of three primary colors, any color within the visible spectrum can be composed of red, green and blue. If you can recognize the three primary colors, you are considered normal. If you cannot recognize the three primary colors, you are called total color blindness. People with reduced ability to identify any color are called color weakness, mainly red weakness, green weakness, and blue-yellow weakness. If one of the primary colors cannot be distinguished, it is called dichromatism, mainly protanopia and deuteranopia.

Color blindness is the lack or complete inability to distinguish colors. Color blindness usually refers to red-green color blindness. Facing the colorful world, how do people perceive it? It turns out that there is a kind of photoreceptor cell in the human retina - cone cells, which have three kinds of photopigments: red, green and blue. Each photopigment mainly excites one primary color of light and responds to varying degrees to the other two primary colors of light. If a certain pigment is deficient, there will be a sensory disorder of that color, manifested as color blindness or color weakness (weak color discrimination).

The difference between color blindness and color weakness

Lack of color vision or incomplete color vision is called color blindness, and low color discrimination ability is called color weakness. Color blindness can be divided into total color blindness and partial color blindness. Total color blindness is extremely rare and manifests as only being able to distinguish between light and dark, lacking color vision; partial color blindness is mostly red-green or blue-blindness. Red-green color blindness is characterized by only red or green vision, that is, the inability to distinguish red and green, which may be caused by the lack of red-sensing cones or green-sensing cones. Tritanopia is rare and manifests as a dominant perception of green, yellow, and red, similar to a weak blue color, and is related to the lack or scarcity of blue-sensing cones. Color blindness can be congenital or acquired. Congenital color blindness is heritable, and acquired color blindness can be improved by removing the cause or supplementing nutrition, such as increasing protein or vitamins A and B. Except for those who are congenital, color weakness often occurs acquired. It is caused by the defective color vision receptor function caused by poor health. It manifests as a reduced ability to distinguish between red, green and blue. Acquired color weakness can be improved by removing the cause or supplementing nutrition.

Each photopigment mainly excites one primary color of light and responds to varying degrees to the other two primary colors of light. If a certain pigment is deficient, there will be a sensory disorder of that color, manifested as color blindness or color weakness (weak color discrimination). Color blindness is divided into many different types. Those who lack the ability to distinguish only one primary color are called monochromatic blindness. For example, protanopia, also known as primary color blindness, is more common; green blindness is called secondary color blindness, which is less common than primary color blindness. Some; tritanopia, the third color blindness, is relatively rare. If a person lacks the ability to distinguish two colors, it is called achromatopsia, which is relatively rare. Color blindness is mostly caused by congenital inheritance, and a few are caused by disorders of the visual conduction system. It is generally passed on by women and expressed by men.

Theoretically, people with total color blindness should only see black and white in their eyes, but this is not the case. Interestingly, people with protanopia can still distinguish red traffic lights, and people with deuteranopia can also distinguish green traffic lights. Why is this? This is because people with monochromatic blindness can distinguish the three primary colors, but cannot distinguish composite colors such as orange and light yellow.

Symptoms of color blindness

Color blindness is divided into many different types. Those who lack the ability to distinguish only one primary color are called monochromatic blindness. For example, protanopia, also known as primary color blindness, is more common; green blindness is called secondary color blindness, which is less common than primary color blindness. Some; tritanopia, the third color blindness, is relatively rare. If a person lacks the ability to distinguish two colors, it is called achromatopsia, which is relatively rare. Color blindness is mostly caused by congenital inheritance, and a few are caused by disorders of the visual conduction system. It is generally passed on by women and expressed by men.

Theoretically, people with total color blindness should only see black and white in their eyes, but this is not the case. Interestingly, people with protanopia can still distinguish red traffic lights, and people with deuteranopia can also distinguish green traffic lights. Why is this? This is because people with monochromatic blindness can distinguish the three primary colors, but cannot distinguish composite colors such as orange and light yellow.

Congenital color vision impairment, often called color blindness, is the inability to distinguish between colors or colors in the natural spectrum. Those with poor ability to distinguish colors are called color weakness. The boundary between it and color blindness is generally not easy to strictly distinguish, but the severity is different. Color blindness is further divided into full color blindness and partial color blindness (red blindness, green blindness, blue-yellow blindness, etc.). Color weakness includes full color weakness and partial color weakness (red weakness, green weakness, blue-yellow weakness, etc.).

Color blindness is divided into full color blindness and partial color blindness (red blindness, green blindness, blue-yellow blindness, etc.), and color weakness includes full color weakness and partial color weakness (red weakness, green weakness, blue-yellow weakness, etc.).

1. Total color blindness

It is a complete cone cell dysfunction, which is exactly the opposite of night blindness (rod cell dysfunction). The patient is particularly fond of the dark and is photophobic, manifesting as day blindness. The colorful world in his eyes is gray, as if he sees black and white.Generally, there is only light and dark, but no color difference, and the red is dark and the blue is bright. In addition, there are symptoms such as poor vision, amblyopia, central scotoma, pendulum nystagmus, etc. It is the most common color vision disorder. A severe form of the disease that is less common in patients.

2. Protanopia

Also known as primary color blindness, patients are mainly unable to distinguish red, dark green, blue and purple, and purple. They often regard green as yellow and purple as blue, and mix green and blue into white. , there was once a mature and prudent middle-aged man who bought a gray woolen sweater. After putting it on, he was laughed at. It turned out that he was a protanopia patient and mistaken red for gray. In the early years, there were reports that a protanopia patient became a train driver. A train collision occurred due to misreading the signal.

3. Deuteranopia

Also known as secondary color blindness, patients cannot distinguish between light green and dark red, purple and cyan, purple and gray, and regard green as gray or dark black. There was a child in an art training class who was very good at drawing. He always paints the sun in green, the tree crowns, and the grass in brown. It turns out that he is a patient with green blindness. Clinically, protanopia and green blindness are collectively called red-green blindness. Patients are more common. What we usually call color blindness generally refers to red-green color blindness. Color blindness.

4. Blue-yellow blindness

Also known as tertiary color blindness, the patient is confused between blue and yellow, but can distinguish red and green, which is rare.

5. Full color weak

Also known as weak red, green, blue and yellow, the degree of color vision impairment is lower than that of full color blindness. There is no abnormality in vision and no other complications of full color blindness. When the color of the object is dark and vivid, it can be distinguished; if the color is light and unsaturated When the disease occurs, it is difficult to distinguish and patients are rare.

6. Partial color weakness

There are red-weakness (primary color weakness), green-weakness (secondary color weakness) and blue-yellow weakness (tertiary color weakness). Among them, red-green weakness is more common. Patients have poor sensitivity to red and green, and their discrimination is difficult when the lighting is poor. The color ability is close to red-green color blindness; but when the color of the material is deep, vivid and the illumination is good, the color discrimination ability is close to normal.

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