Patients look only at the far side in one eye and only at the near side in the other eye. In the long run, the visual function will be greatly reduced, forming alternating vision, destroying the normal visual stereoscopic sense, and in serious cases, causing strabismus. It is a clinical symptom of refractive error. Refractive aberration refers to the unequal refractive power of both eyes. Those with a difference of more than 2.00D usually have symptoms due to difficulty in image integration. As the adjustment activity is simultaneous in both eyes, the higher refractive index eye is often in a blurred visual state, which can easily cause amblyopia, and the higher refractive index eye of a hyperopic person becomes amblyopic. The refractive state and degree of the two eyes are not the same, generally more than 250 degrees difference between the two eyes, called refractive parallax. 1, adjust the mood to keep people’s mental activity is an important factor affecting the physiological function of the internal organs, when the spirit is happy, the blood will increase a beneficial health chemicals. On the contrary, anger, depression, sadness, emotions in the chaos, will seriously interfere with the function of human internal organs, in a depressed state will inhibit the secretion of digestive juices and intestinal peristalsis, causing loss of appetite, over time will lead to malnutrition in pregnant women, which in turn affects the development of the fetus, may lead to amblyopia. Therefore, Shanghai New Vision Eye Hospital experts remind pregnant women: during the pregnancy period, we should pay attention to the regulation of emotions, to achieve a relaxed mood, to maintain a good psychological state, to avoid the impact of bad emotions on the function of the body. If pregnant women are paranoid, picky or anorexic, it will lead to malnutrition and make certain trace elements lacking, which will affect the development of the fetus and even lead to malformation. For example, zinc is an essential element for the growth and development of the fetal eye and visual function, if the pregnant woman is deficient in zinc, it may lead to the occurrence of fetal amblyopia. Pregnant women must ensure adequate nutrition to keep themselves healthy and their fetus well developed. They must take the initiative to achieve a balanced diet, not to be partial or picky, and to eat light and nutritious food, not to overindulge in stimulating foods such as spicy acid and coffee. Foods rich in zinc include meat, fish and shrimp. 3, quit smoking and alcohol to develop good habits alcohol can consume a lot of zinc, often alcoholic pregnant women can make the body lack of trace elements of zinc, so that the fetus visual organ development and amblyopia. Research has confirmed that tobacco contains a very toxic “cyanide”, long-term smokers, cyanide is easy to accumulate in the body, once the accumulation of too much, slowly cyanide poisoning will occur and lead to tobacco toxic amblyopia. Especially smokers and alcoholics are more likely to have tobacco toxic amblyopia. Therefore, if you want your baby’s eyes to develop well, pregnant women should not only quit smoking and alcohol, but also try to stay away from the passive smoking environment is better. 4, prevention of disease to protect the health of pregnant women infected with certain viruses, can directly affect the development of fetal visual organs, resulting in infant amblyopia. Therefore, pregnant women should not often travel to and from places where the population is concentrated and there is a large flow of people to avoid infection.