Abstract: as the saying goes, “flower or not, forty-eight”. Most people will have presbyopia when they are about 48 years old. There is a saying in life that people with myopia will not get presbyopia when they are old. The reason is that some people with myopia can meet the need of looking close without reading glasses in old age.
recently, Ms. Wang, 48, felt a little fuzzy when reading the newspaper. She looked at the distance clearly with myopia glasses, but she was still “confused” when looking at the near. A friend said she was presbyopia. Ms. Wang said it was impossible. She was myopic. Myopic eyes should wear concave lenses, while presbyopia should wear convex lenses. In this way, positive and negative subtraction just offset. How can she be dazzled?
many people think the same as Ms. Wang. They think that people with myopia will not get presbyopia when they are old. Is this really the case? In addition, many old people don’t go to the glasses store to get glasses after their eyes are old. Instead, they buy a pair of glasses on the street. As long as they can see clearly, is this correct?
people will get “presbyopia” when they are old. To find out whether myopia will get presbyopia when they are old, we must first understand what is “presbyopia”. Take the function of the camera as an example:
cameras need to adjust the focal length of the lens before they can take a clear picture, The focal length used to shoot a scene 5 meters away is different from that used to shoot a scene 1 meter away. The task of adjusting the focal length is completed by the photographer. The imaging principle of human eyes and camera is basically the same.
in order to see objects at different distances, the human eye also needs to constantly adjust the focal length, which is completed by adjusting the convexity of the lens in the eye. When people are young, the lens has good elasticity and can see objects at different distances. With age, the elasticity of the lens gradually decreases, and the muscle function of the eye gradually decreases. The range of lens regulation becomes smaller and smaller, so you can’t see the nearby objects. This decline in the regulatory power of the eye itself is a normal aging degradation phenomenon, “presbyopia” will appear, which everyone can’t avoid.
myopia will also get “presbyopia”
as the saying goes, “if you don’t spend, you will be forty-eight”. Most people will have presbyopia when they are about 48 years old. There is a saying in life that people with myopia will not get presbyopia when they are old. The reason is that some people with myopia can meet the need of looking close without reading glasses in old age. In fact, this view is one-sided. In fact, people with myopia will still grow old, but the lens degree is different.
myopia is to see the near object clearly, but the far object can’t see clearly, while presbyopia is to see the near object clearly, and the far object is the same as the original. The old man without myopia has presbyopia. He doesn’t need glasses to see far away, but only when he sees close. And the original myopic people have presbyopia. They still have to use myopia glasses to see far away. They may not be able to see near.
presbyopia has a certain relationship with the use of eyes when young. If the eyes are overworked, presbyopia will “check in” in advance. Young people don’t want to wear presbyopia glasses, which requires more attention at ordinary times. Don’t always make your eyes tired.