Reading glasses are a type of optical glasses, which provide myopia glasses commonly used by people with presbyopia, which belong to a convex lens. Reading glasses are used to fill the eyesight of middle-aged and elderly people. Like myopia glasses, they have many electronic optical index values required by national industry standards, and also have some unique application regularities. Therefore, reading glasses must be equipped with glasses.
First, the basic classification of reading glasses
At present, there are three key types of reading glasses on the market, namely single vision lens, bifocal lens and asymptotic multifocal lens.
Single vision lens can only be used to see near, and vision must be restored when looking at distance. It is only suitable for people with simple presbyopia and low frequency of using reading glasses;
Bifocals refer to reading glasses with the upper spectacle lens used to see far, and the lower half spectacle lens used to see near, but such reading glasses will have blurred vision and bounce, and long-term wearing is very prone to eye soreness, dizziness, etc. , the domestic design is not good-looking, and it is not common now; the asymptotic multifocal lens can meet the requirements of blurred vision at different distances in the distance, middle and near. The appearance is high-tech and fashionable, and it is more suitable for contemporary myopia over the age of 40. Eye plus presbyopia, astigmatism group wear.
Second, the application scenarios of reading glasses
Presbyopia is a normal physiological phenomenon, not an eye disease, nor is it only an old person. After the age of 40, with the gradual hardening of the chemical fibers of the eye lens and the gradual numbness of the ciliary body, the human eye cannot reasonably adjust the appearance of the gaze (radial transformation). Depending on the distance between the objects, you must move far away when looking at close objects before you can see clearly. The condition of both eyes at this time is called presbyopia.
If presbyopia wants to use the eye vision on the original habitual distance, it is necessary to wear reading glasses to fill in the eye vision, so that the near vision can be clearly seen again. Two pairs of eyes. The degree of myopia in presbyopia is related to age. With the increase of age, the deterioration of the eye lens will increase, and the degree of myopia will gradually increase.
Presbyopia has already occurred, and if you insist on not wearing reading glasses, the ciliary body will be exhausted and unable to adjust, which will definitely aggravate the difficulty of reading, cause dizziness, dizziness and many other diseases, which will endanger daily life and work. High self-esteem. Therefore, presbyopia glasses should be matched immediately without delay (Chinese people have a misguided idea: they think that wearing reading glasses is a serious “disease”, and they do not recognize the existence of reading glasses. This is a wrong idea) .
After getting older, the reading glasses originally equipped with insufficient myopia have to be replaced immediately. Therefore, reading glasses should not be worn all the time. Long-term wearing of reading glasses with an inappropriate degree of myopia will not only cause a lot of trouble for one’s daily life, but also continue to speed up the process of binocular presbyopia.
Under normal circumstances, there are two main manifestations of presbyopia in the early stage:
The first is close work or difficult reading. For example, when reading, you must hold the book far away, or you must read in an area with strong light sources to recognize it.
The second is eye fatigue. With the reduction of accommodation power, reading requirements gradually approach the limit of accommodation power, that is, when reading, basically all the accommodation power of both eyes must be used, so that it is impossible to use the eyes for a long time, and it is very easy to cause eye swelling due to excessive adjustment. , headache and other visual fatigue symptoms.
The occurrence of the above two conditions indicates that the eyes are likely to gradually become old. For myopic groups, it is necessary to take off myopic glasses or adjust the reading book far away when reading at close range, which is also the main manifestation of presbyopia. After both eyes are presbyopic, the safest way is to wear suitable reading glasses for calibration.
Post time: Aug-09-2022