High myopia has become the second main cause of blindness

Abstract: if the best corrected visual acuity is taken as the standard, myopia accounts for 12% of the causes of blindness and 14% of the causes of serious visual impairment. Myopia is the second cause of blindness or visual impairment, which is unimaginable in western countries.

myopia is a common eye disease in our daily life. Many people do not know that myopia is the main cause of far vision loss. High myopia with myopia degree greater than 600 degrees is one of the main causes of blindness and visual impairment due to serious complications, such as choroidal neovascularization, macular degeneration, retinal detachment, glaucoma and cataract.

“it is particularly noteworthy that the incidence of myopia in Eastern Asian countries such as China, Japan and Singapore is much higher than that in other parts of the world.” Professor Hu Shengning, an ophthalmology professor at New York Medical College and director of the myopia Institute of the optometry research center of the national health and Family Planning Commission, who has been working in the United States for a long time, said anxiously at the meeting.

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research data show that among the people aged 15 ~ 20, the prevalence of myopia in China, Japan and Singapore is the highest, reaching 50% ~ 80%; The myopia rate in Europe, North America and Australia is also high, 20% ~ 30%; The myopia rate in South America and southern Asia is low, 10% ~ 20%; The myopia rate in Africa is less than 10%.

the situation is not optimistic from the perspective of the prevalence of high myopia that may cause blindness. In Europe, North America and Australia, patients with high myopia account for only 1% ~ 3% of the population, while among students aged 15 ~ 18 in Eastern Asian countries, the prevalence of high myopia has risen from 1% ~ 3% to 5% ~ 20%. This figure is much higher than that of other countries in the world. Experts from

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pointed out that in eastern Asia, high myopia is the second cause of moderate to severe visual impairment and blindness in practical life, second only to cataract.

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involve 9 provinces in China According to the survey of vision impairment and blindness among 45000 people and people over 50 years old in (city), 16% of the patients with moderate to severe impairment of practical life vision and blindness in China are caused by myopia. While the patients with moderate to severe impairment of practical life vision account for 11% of the survey population, and the blind account for 2.3%. According to this calculation, about 26 million middle-aged and elderly people in China are blind or cause moderate to severe myopia Visual impairment is second only to cataract. The latest research results show that in some areas of China, the number of patients with visual impairment or blindness caused by myopia has even exceeded cataract. If

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take the best corrected visual acuity as the standard, myopia accounts for 12% of the causes of blindness and 14% of the causes of serious visual impairment. Myopia is the second cause of blindness or visual impairment, which is unimaginable in western countries.

myopia blindness rate may continue to rise

let experts worry that in recent years, the incidence of myopia and high myopia in China continues to rise and the situation is still deteriorating. For example, the prevalence of myopia among middle school students in Shanghai soared from 20% in 1975 to 62% in 2004. The high myopia rate of college students in Shanghai is also rising. The survey in 2012 showed that one in five college students is high myopia. A similar situation also exists in Taiwan.

“the incidence of myopia and high myopia has increased sharply, which is likely to lead to the increase of myopia blindness rate in the future.” Hu Shengning pointed out that in the past, the subjects of blind and low vision surveys in China were usually middle-aged and elderly people. For example, the people involved in the survey in 2005 were 50 years old, 30 years ago (1975), this group was only 20 years old. At that time, the prevalence of myopia was only 30%, and the high myopia rate was less than 2%. Now, the prevalence of myopia has entered a high incidence period, and the blindness rate of myopia may continue to rise in the future. “In China and other Eastern Asian countries, it remains to be closely observed whether the number of people with blindness and low vision caused by near vision will further increase in the next 10 years.”

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experts pointed out that the high myopia rate in Eastern Asian countries, including China, may be due to genetic factors, or may be related to bad living habits such as excessive close eye work and lack of outdoor activities. Among them, Chinese students have less outdoor activities and significantly more reading and writing time than western students, which is an important reason for the high prevalence of myopia among the young generation in China.