How to choose reading glasses correctly

Abstract: most reading glasses are not suitable or very suitable, and even bring unnecessary trouble and pain to the wearer.

many people think presbyopia glasses are very simple. Just try wearing a few pairs of presbyopia lenses and choose one at random. In fact, this understanding and practice are unscientific. The glasses prepared in this way: most of them are not suitable or very suitable, and will even bring unnecessary trouble and pain to the wearer.

choose reading glasses. Don’t be greedy for cheap.

five yuan reading glasses. Dare you wear them? Recently, some consumers called to report that they often feel dizzy and nausea after wearing inferior reading glasses. A month ago, Mr. Liu, a citizen of

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, bought a pair of foldable presbyopic glasses at a stall near the Confucius Temple. It was only five yuan for the glasses box and cloth. He found that it was more and more expensive to see things after wearing them for a few days. After a long time, his head would be dizzy and accompanied by a strong sense of vomiting. Glasses not only didn’t help his eyes, but hurt his body, which made him regret it.

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do sell cheap reading glasses. The lowest price is five yuan, and the highest is only ten yuan. Some elderly people think the price is cheap and buy them one after another. The reporter noted that the lens of this kind of glasses is uneven, and the frame is also very easy to break.

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the elderly also need optometry with reading glasses, and choose appropriate lenses. Rough workmanship of ground stall goods is very harmful to eyes. Wearing them for a long time will cause many diseases, so they should be purchased with caution. How should

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test the light for people with presbyopia. How about glasses?

to this end, we must start with the simple basic knowledge of the occurrence and development of presbyopia: to put it bluntly, each of our eyes has a colorless, transparent, front and back convex lens behind the pupil. Like a magnifying glass, it has strong refractive power because it is rich in certain elasticity and expansion ability, Therefore, under the action of surrounding muscles and ligaments, you can change your thickness at any time, so as to change the refractive power. This change is called eye regulation in medicine.

when we look far away, the adjustment is relaxed (the lens flattens and the refractive power decreases); When you look close, the adjustment is strengthened (the lens thickens and the refractive power increases). However, in a person’s life, the nucleus of the lens is gradually increasing and hardening, which will affect the expansion force of the lens. By the age of about 40, the expansion force of the lens decreases significantly, so that when the target is close, the near vision will decline due to insufficient adjustment force. It is necessary to move the target farther to be clearer, This is the emergence of presbyopia, which is called presbyopia in medicine.

after the age of 40, presbyopia is getting bigger and bigger. Generally speaking: 40 year old people spend + 1.00 degrees (used to be called 100 degrees). 50 year olds spend + 2.00 degrees, 55 year olds spend + 2.50 degrees, 60 year olds spend + 4.00 degrees. After 70 year olds spend + 4.00 degrees, the old flowers do not increase (the crystals have all hardened).

however, the relationship between the above age and old flowers is not absolute, and sometimes there is a big gap. This is closely related to the original refractive state of each person or eye, as well as everyone’s physique, nutrition and other conditions. Therefore, we should not only consider it according to age, and a person’s two eyes may be different. In this way, it is impossible to buy glasses casually.

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