Views: 201 Author: Site Editor Publish Time: 2021-03-20 Origin: Site
Nowadays, teenagers are often faced with myopia. However, for everyone, starting from around 40 years old, they will face the problem of presbyopia.
Presbyopia is a physiological phenomenon, neither a pathological state nor a refractive error. It is a visual problem that inevitably occurs after people enter middle-aged and old age. With age, the lens of the eye gradually hardens and thickens, and the adjustment ability of the eye muscles also decreases, resulting in a decrease in zoom ability.
Many elderly people think it is normal to get presbyopia after seeing things blurred. If you don't go to a regular optical shop to get an optometry, you can just buy a pair of cheap reading glasses and wear them on the street, or even wear a pair of adjustable reading glasses with your wife. In fact, it is not only easy to pay attention to symptoms such as fatigue and blurred vision, but also great damage to the eyes.
With the increase of age, the vision of seeing far and near will change respectively. Therefore, it is recommended that everyone go to a regular eyeglass shop for a systematic vision check, including distance vision and near vision. And it is best to have a vision check every six months or a year.
Reading glasses available on the market include half lens reading glasses, progressive multifocal reading glasses and multifocal prescription glasses.
After passing a professional vision examination, the vision status of middle-aged and elderly people can be roughly divided into the following situations:
1. Choose flat glasses for far view, good reading glasses for near view. You can walk without glasses, but you need to wear glasses to look close.
2. Choose reading glasses for distance vision or hyperopia + astigmatism when looking far away, and reading glasses for near vision. You need to wear glasses for walking, and goggles for looking closer.
3. Choose nearsightedness or myopia + astigmatism for farsightedness, and reading glasses for nearsightedness. You need to wear glasses for walking, and goggles for looking closer.
In summary, you wear glasses while walking, but you also need to wear breakaway reading glasses when you look closer. That is to say, it is too troublesome to use two pairs of glasses alternately.
The advantage of reading glasses is that every point of the entire lens is quite clear at close range. The shortcomings are mainly reflected in the following two aspects: one is that you can only look close after wearing glasses, the vision is blurred when you look up, and the other is that the appearance is not beautiful.
The advantage of wearing two pairs of glasses is that the field of view is large, the same pair of glasses can be used to see far and near, and the cost is lower. The disadvantage lies in the following two aspects: the first is that there are obvious separation between different areas, the appearance is not beautiful, the middle distance is blurred, and the adaptation period is required. The second is the phenomenon of prismatic jumping, dizziness when going up and down the stairs.
Bifocal glasses solve the vision problem of looking far and near at the same time.
The disadvantages are as follows: 1. From looking far to looking close, the imaging has a sense of jumping, unnatural, and incoherent; 2. unclear vision in the middle distance; 3. there are obvious marks on the lens, which is not beautiful and reveals age.
The advantages of progressive multifocal lenses: 1. this kind of lens has continuous and clear vision throughout; 2. the appearance is better than bifocals and trifocals, there is no sub-film dividing line, and there is no annular blind zone.
The disadvantage lies in the following three points:
1. There are deformation areas under the left and right sides of the lens, which makes the image blurry and irregular. It takes 1-3 weeks to adapt;
2. You need to look down when going up and down the stairs;
3. The field of view is narrow in the short and medium distances, and long-term concentration on the narrow focal point can make the eyes tired. This kind of progressive multifocal glasses is suitable for people who need alternate vision between far, middle and near.
The above-mentioned suitable reading glasses can effectively solve the problem of presbyopia in middle-aged and elderly people.