What is color blindness? What is a weak color?

Color blindness is also called Dalton's disease 1. Color blindness belongs to complete cone cell dysfunction, which is just the opposite of night blindness (rod cell dysfunction). Patients especially like darkness and photophobia, showing day blindness. The colorful world is gloomy in its eyes, just like watching black and white TV, only light and shade, no color difference. Moreover, red is dark and blue is bright. In addition, there are symptoms such as poor eyesight, amblyopia, central scotoma and oscillatory nystagmus. It is one of the most serious color vision disorders, which is rare for patients. 2. Red blindness is also called the first color blindness. The patient can't tell red from dark green, blue from purple and purple. Green is often considered yellow, purple is considered blue, and green and blue are mixed into white. Once, a self-serious, middle-aged man bought a gray sweater and put it on, which attracted ridicule. It turned out that he was blind in red and turned red into gray by mistake. Earlier, it was reported that a red-blind patient became a train driver, and the train collided because he misread the signal. 3. Green blindness is also called second color blindness. Patients can't tell light green from crimson, purple from cyan, purple from gray, and regard green as gray or dark black. In an art training class, a child painted very well. He always paints the sun green and the crown and grass brown. It turns out that he is green blind. Clinically, red blindness and green blindness are collectively referred to as red-green color blindness, and patients are more common. We usually refer to color blindness as red and green color blindness. 4. Blue-yellow blindness is also called third color blindness. Patients can't tell blue from yellow, but can distinguish red from green, which is rare. 5. Full color weakness is also called red, green, blue and yellow weakness. The degree of color vision disorder is lower than that of color blindness, and there is no abnormality in vision and other complications of color blindness. When the color of the object is dark and bright, it can be distinguished; If the color is light and unsaturated, it is difficult to distinguish. There are also very few patients. 6. Some weak colors are red (the first color is weak), green (the second color is weak) and blue-yellow (the third color is weak), among which red and green are weak. When patients have poor sensitivity to red and green and poor light, their color discrimination ability is close to red and green color blindness; However, when the color of the substance is dark and bright and the illumination is good, its color discrimination ability is close to normal. Color-blind (weak) patients are born with no correct color discrimination ability, and think that others are the same as themselves, so they don't feel sick. Many color-blind patients have no abnormal findings in eye examination. When the red and green colors are particularly obvious or single, patients often distinguish them by unique experience, so color blindness (color weakness) can only be judged by special color vision examination. The methods of color blindness inspection generally include color blindness inspection mirror, color blindness inspection lamp, false homochromatic table (color blindness inspection table) and color hair bundle. In the physical examination of enrollment, false homochromy tables and color hair bundles are often used for color vision inspection. Studies have shown that color blindness can be inherited, usually more than women. In China, the incidence rate of male is about 5% ~ 8%, and that of female is 0.5 ~ 1%. Japanese men are about 4% ~ 5%, and women are 0.5%; 8% men and 0.4% women in Europe and America. Patients have many inconveniences in life and are limited in choosing jobs. Color blindness has been regarded as an incurable disease since Dalton discovered it. Nowadays, in China and Japan, the treatment of red-green blindness (weakness) has made gratifying progress and brought good news to the majority of patients. I believe that it is not far away to completely conquer this "incurable disease". Treatment of color blindness: Acupoints and acupressure can improve the function of the eyes by acupressure on the "four whites" located 2 cm below the center of the eyeball. Exhale when finger pressing, and press hard with index finger for 6 seconds. Finger pressure can be applied to open eyes and closed eyes. You can clearly judge the color by pressing your fingers with your eyes open. Close your eyes and press your fingers to treat abnormal vision and pseudomyopia. If you have a strong color abnormality, you should press your eyes. Insist on doing this kind of shiatsu, and you will gradually get rid of the abnormal color vision. You may wish to shiatsu in front of the mirror once in the morning, and it is advisable for women to shiatsu after unloading at night. Color blindness correction lens-an effective method to correct color blindness. The principle of color blindness correction lens is to cut off the wavelength by special coating on the lens according to complementary color antagonism, which can transmit long wavelength and reflect short wavelength. Wearing color-blind glasses can make the original color-blind picture book unclear and inaccurate. Achieve the effect of correcting color vision disorder. Color blindness correction lenses can be divided into contact lenses and common wide-frame Fiske color blindness correction contact lenses, which have outstanding correction effects on both red blindness and green blindness, and are the best color blindness correction contact lenses on the market at present. The major of color blindness is 1, and the major with slight abnormal color vision (commonly known as weak color) cannot be admitted: chemistry, chemical engineering and pharmacy, pharmacy, biological science, public security technology, geology and medicine with strict technical standards of color wavelength; Biological engineering, biomedical engineering, animal medicine, animal science, wildlife and nature reserve management, psychology, applied psychology, ecology, reconnaissance, special energy engineering and pyrotechnic technology, archaeology, marine science, marine technology, marine engineering, food science and engineering, light chemical industry, forest chemical industry, agronomy, horticulture, plant protection, tea science, forestry, horticulture, sericulture. Material chemistry, environmental engineering, polymer materials and engineering, process equipment and control engineering, preschool education, special education, physical education, sports training, sports human science, national traditional sports. 2. The majors that can't be admitted with abnormal color vision degree II (commonly known as color blindness) are fine arts, painting, art design, photography, animation, museum science, applied physics, astronomy, geographical science, applied meteorology, material physics, mineral processing engineering, resource exploration engineering, metallurgical engineering, inorganic nonmetallic material engineering, transportation, oil and gas storage and transportation engineering, etc. The specialty is the same as or similar to the above major.