Fu Te, deputy director of the Department of Ophthalmology for Children with Oblique Amblyopia in Jinan Second People's Hospital, said in an interview that myopia and presbyopia can not only offset, but people with myopia often have presbyopia earlier.
Myopia is the opposite of hyperopia. Myopia is influenced by many factors, such as heredity, development, eye habits and so on. Fute explained that in the eyeball development stage, excessive close use of high-intensity eyes will lead to continuous contraction of the ciliary muscle, which is in a state of high tension, which is easy to cause spasm and the lens axis is elongated, resulting in decreased vision. Fute said: "Myopia people seldom use ciliary muscle regulation function, so they can't get effective exercise, and the regulation function is more likely to deteriorate, so they are more likely to presbyopia."
Feng Qingyang, an ophthalmologist at Guangdong Maternal and Child Health Hospital, said that what we usually call presbyopia is a vision problem that gradually appears after entering middle-aged and elderly people. Just as the hair turns white and the skin wrinkles, with the increase of age, the function of the eyes gradually declines, the adjustment ability of the eye muscles will decline, the lens will thicken and harden, and the zoom ability of the eyes will be reduced. Therefore, when you look at near objects, your eyesight is unclear, which is often accompanied by the inability to use your eyes at close range for a long time, and you need stronger lighting to read.
So what's the connection between the two? If myopia has presbyopia, you can take off your glasses when looking at close objects, giving people the illusion that myopia and presbyopia are offset, but in fact, only the lens power is just offset. Myopia glasses belong to negative spherical glasses, and presbyopia glasses belong to positive spherical glasses. If he was short-sighted when he was young, such as 100 degrees, he would wear reading glasses 5 ~ 10 years later than his peers who were not short-sighted. Therefore, people who are nearsighted will still have presbyopia, but the lens degrees are different.
Presbyopia and myopia patients can choose bifocal lenses. The bifocal lens reading glasses are designed for myopia and presbyopia patients. Therefore, the far focal length is generally placed on it, and the lenses that need to see the near focal length and presbyopia are placed below. This kind of glasses is more suitable for presbyopia patients with myopia above 300 degrees. The advantage is that you can see far and near as long as you have a pair of glasses.
This article is scientifically checked by Liu Dongbao, chief physician of ophthalmology department of Shenyang Red Cross Hospital. Experts are good at common eye diseases, frequently-occurring diseases, difficult diseases, eye plastic surgery, eye tumor resection, eye deformity correction and refractive disease treatment.