What is yellow-green blindness?

1. Color blindness \ x0d \ x0d \ 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. \x0d\\x0d\ 2。 Red blindness \ x0d \ \ x0d \ is also called 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. \x0d\\x0d\ 3。 Green blindness \ x0d \ \ x0d \ 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. \x0d\\x0d\ 4。 Blue-yellow blindness \ x0d \ \ x0d \ is also called third color blindness. Patients can't tell blue from yellow, but can distinguish red from green, which is rare. \x0d\\x0d\ 5。 All-color weakness \ x0d \ \ x0d \ 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. \x0d\\x0d\ 6。 Some colors are weak \ x0d \ \ x0d \ including red (the first color is weak), green (the second color is weak) and blue-yellow (the third color is weak), among which red-green color is more common. The patient's sensitivity to red and green is very poor, and the color discrimination ability is close to red in the case of poor illumination. However, when the color of the substance is dark and bright and the illumination is good, its color discrimination ability is close to normal.