Abstract: presbyopia can also occur in patients with myopia. Myopia is that you can’t see clearly from a distance. You need to wear myopia glasses (a concave lens) to see clearly. When the age of presbyopia comes, you need to reduce the degree of the original concave lens (equivalent to adding a convex lens) and even take off your nearsighted glasses to see clearly.
the so-called “presbyopia” refers to the situation that older people gradually have difficulty in close reading or work, which is a phenomenon of aging human function.
presbyopia can not be avoided. When young, the lens of people’s eyeball is soft and elastic, which can thicken and thin at any time. It has excellent adjustment function when looking at nearby things. However, with age, the ocular lens gradually hardens and thickens, reducing the zoom ability. Therefore, when looking at near objects, the close objects become blurred because the image cannot be fully focused when projected on the retina.
how to select reading glasses scientifically?
can suddenly see clearly without reading glasses. Is it really “rejuvenating”?
today, I will share with you the pathology, symptoms and coping methods of “presbyopia”, so as to help you understand this eye disease from the perspective of Ophthalmology knowledge and deal with possible symptoms with a more positive attitude.
1. You may also get “presbyopia”
myopia will not get presbyopia. This statement is incorrect. Both men and women, as well as myopia and hyperopia, will face the phenomenon of presbyopia.
in fact, presbyopia can also occur in patients with myopia. Myopia is that you can’t see clearly from a distance. You need to wear myopia glasses (a concave lens) to see clearly. When the age of presbyopia comes, you need to reduce the degree of the original concave lens (equivalent to adding a convex lens) and even take off your nearsighted glasses to see clearly. In fact, you still have myopia and presbyopia. It just gives people the illusion that you can read and report without wearing presbyopia glasses.
2. Changes with age
people’s presbyopia is irreversible, and the better their eyesight, the more obvious their presbyopia symptoms will be. If you have headache, eye pain and other symptoms of presbyopia, you should go to a professional shop immediately to match presbyopia glasses. Wearing reading glasses (a convex lens) is the simplest and necessary method. Since the degree of presbyopia will change with age, the degree of presbyopia will also deepen.
are two methods of matching presbyopic glasses.
the first is to add 1 / 3 of the adjustment force to the degree of glasses to see objects at close range;
the second is to use the lowest mirror to see close objects. The practice of many old people has proved that the latter is better.
the principle of wearing reading glasses
if you can see close, wear them as late as possible; If you can see at a low level, you don’t wear depth glasses. Generally, the eyes wear 75 ~ 100 degrees for the first time, and then increase by 50 degrees every year until the age of 70. When wearing fancy glasses, optometry should be carried out first to avoid that the degree of wearing fancy glasses for the first time is too large and falling into a deeper state, causing ciliary muscle degeneration and damaging vision. Therefore, people with presbyopia choose to wear appropriate presbyopia glasses, which is beneficial to eye health care and the convenience of life and work.
hyperopia and “old flower” are not the same thing.
hyperopia is ametropia, mainly manifested in unclear far vision, unclear near vision and visual fatigue. Hyperopia occurs since childhood. Presbyopia is a natural physiological aging phenomenon. With the decline of regulatory power, presbyopia will occur whether there is myopia or hyperopia from about 40 years old. It shows that the reading object can be seen clearly only by putting it far away. At a certain time, it needs a positive lens to help see clearly.
3. It’s not “rejuvenation”
an old man wore flower glasses for more than ten years. Recently, he can do needlework without glasses. People think it’s “rejuvenation”. In fact, it may be caused by disease. At this time, it’s best to go to the ophthalmology for examination, because some of the phenomenon of “60 flower nail to youth” is caused by lens sclerosis and senile cataract.
with the increase of age, the metabolism in the crystal will change abnormally, and the crystal fibers will become denatured, swollen and turbid to a certain extent, The crystal is fully swollen due to internal fibers (i.e. the expansion period of cataract) increases the thickness of the lens. At this time, the elderly will feel that their eyesight is significantly better than before. They can see small objects at close range without reading glasses. Due to the slow development of cataract, they can lose sight for months or years, and a few cases can stop developing. Therefore, some elderly cataract patients improve their eyesight over a period of time, But “rejuvenation” is impractical and impossible.