With the continuous progress of society and the emergence of various electronic products, many children have put on thick glasses, so if parents are nearsighted or myopic, what is the probability? What is the genetic probability of nearsightedness?
Parents are all short-sighted children may not be short-sighted generally speaking, the degree of myopia reaches 600 degrees, which is high myopia. Usually both parents are high myopia, and the probability of passing myopia on to children is large; one side is high myopia, and the genetic probability is reduced by about half; both sides are low myopia, and the probability of passing on is smaller. Genetic factors are less important, and environmental factors account for 70% Article related link: http://www.4hw.com.cn/life/jiankang.html
At present, from many studies, it is found that the common concern about myopia is indeed related to heredity, but whether it occurs is greatly affected by environmental factors. In other words, myopia is determined by both parents' genetic characteristics and environmental factors. Why do you say that? Listen to me slowly.
Myopia is generally divided into two types: common myopia and high myopia. Common myopia is generally below 600 degrees, which can develop from childhood to 25 years old, and can be corrected to normal by wearing glasses. It is generally believed that common myopia is not inherited, and its occurrence is generally considered to be caused by children's inattention to eye hygiene and other factors.
On the contrary, the survey found that the incidence of myopia in people with a family history of high myopia was higher than that in people without a family history of myopia, and high myopia was also related to environmental factors. High myopia is more than 600 degrees, even wearing glasses is difficult to correct to normal. Generally speaking, the more serious myopia is, the more likely it is inherited by parents. High myopia is an autosomal recessive genetic disease Article related link: http://www.4hw.com.cn/life/jiankang.html
If both parents are highly myopic, the incidence of their children is 100%. If one parent is highly myopic and one person is the carrier of pathogenic gene, the incidence of their children is 50%; if both parents are not patients but only gene carriers, the incidence of their children is 25%; if one parent is highly myopic and the other person is normal, their children will not be sick, but may be gene carriers. Understand this, you should understand why some only two or three-year-old children also wear thick glasses.
As just said, high myopia is hereditary, but it is also related to the environment. The environment after tomorrow may aggravate the degree of myopia. If you happen to be a nearsighted person, please pay attention to your child's eye hygiene in the future to avoid causing or aggravating nearsightedness.