In view of the question whether myopia in the elderly will lead to presbyopia, Dr. Xiong Ying from the Department of Myopia, Beijing Tongren Hospital pointed out that presbyopia refers to a phenomenon of aging of human body function, which is inevitable. When people are young, the lens of the eyeball is soft and elastic, which can be thickened and thinned at any time, and has excellent adjustment function when looking at things nearby. However, with the increase of age, the lens of eyeball gradually becomes hard and thick, which reduces the zoom ability. Therefore, when we look at the near object, the close object becomes blurred because the image cannot be fully focused when it is projected on the visual film.

People with myopia will also have presbyopia. People with myopia need to reduce the original concave lens power (equivalent to adding convex lens) when presbyopia comes, and even take off their myopia glasses to see clearly. For example, you used to be 250 degrees nearsighted, but now you are 200 degrees presbyopic. Look at the near objects, only need a concave lens of 50 degrees. At this time, you don't need to wear glasses to see nearby objects.

Because it is equal to only 50 degrees myopia.

Dizziness is irreversible when people are old. The better their eyesight, the more obvious their symptoms will be.

Xiong Ying introduced that the human eye structure is very similar to a camera, and it has some "adjustment devices", including intraocular lens and ciliary muscle. When looking at near objects, the ciliary muscles contract, and the lens becomes convex, so that the object image just falls on the visual China membrane, and things can be seen clearly. If there is something wrong with the "adjusting device" of the eyes, myopia, hyperopia and presbyopia will appear, which is a normal phenomenon in human physiology. As for some old people who wear reading glasses, if they can read without reading glasses for a while, it seems that they are "rejuvenated" and become younger, which may actually be caused by illness.

With the increase of age, the metabolism in the lens will change abnormally, and the lens fiber will be degenerated, swollen and turbid. To some extent, due to the full expansion of internal fibers (that is, the expansion period of cataract), the thickness of lens will increase. At this time, the old people will feel that their eyesight is obviously better than before, and they can see tiny objects at close range without wearing reading glasses.

In patients with primary cataract and swelling cataract (also common in senile diabetes), when the lens swells and bulges, the refractive power of the central part increases, but the near object is clear, so they switch to reading glasses with lower degree, even without glasses; When looking at the distance, if the lens opacity does not spread to the pupil area, hyperopia has little effect. Moreover, due to the slow development of cataract, it may take months or years to become blind, and a few cases can stop developing. Therefore, some senile cataract patients have improved their vision for a period of time, but "rejuvenation" is unrealistic and impossible.