You Need To Know The Basics Of Reading Glasses

Reading glasses, also known as presbyopia glasses, is a class of optical glasses that provide myopia glasses commonly used by people with presbyopia in both eyes, belonging to a convex lens. Reading glasses are used to fill the eye vision of the middle-aged and elderly, it has a lot of national industry standard requirements of the electronic optical index value, but also has some unique application regularity, 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, that is, single light mirror, double light mirror and asymptotic multifocal mirror.
Single-light mirror is only used to see close, to see far must restore vision, only suitable for simple presbyopia and use of reading glasses low frequency people;
Bifocal mirror refers to the upper lens to see far, the lower half of the lens to see close reading glasses, but this kind of reading glasses vision blurred will appear bounce, long-term wear is very easy to eye distensibility, dizziness and other conditions, domestic design is not good, now is not common; The asymptotic multifocal mirror can meet the requirements of blurred vision at different distances from far, middle and near. It is high-tech and fashionable in appearance, and is more suitable for contemporary myopia and presbyopia and astigmatism above 40 years old.
Second, the application of reading glasses
Presbyopia is a normal physiological phenomenon, not an eye disease, and not only old people. After the age of 40, the chemical fibers of the eye crystals of the human eye are slowly hardened, and the ciliary body is slowly numb, so that the human eye can not reasonably adjust the look of the eye (radial transformation), only according to the adjustment of the distance between the eyes and the object seen, the object must be moved away from the close to see, at this time the eyes situation is called presbyopia.
If presbyopia wants to apply eye vision at the original habitual distance, it is necessary to wear reading glasses to carry out eye vision filling, so that you can see clearly again, and by no means pretentiously, reading glasses are the second pair of eyes after every person steps into the middle and old age. Presbyopia myopia degree is related to age, with the improvement of age, the deterioration of eye crystal, myopia degree will gradually increase.
Presbyopia has already occurred, strong support not wearing reading glasses, then the ciliary body tired can not be adjusted, will aggravate the difficulty of reading, causing dizziness, dizziness and many other diseases, endangering daily life and work, it is very high. Therefore, presbyopia myopia glasses when matched, do not have to delay (people have a misguided idea: think that reading glasses is a serious "disease" is not recognized the existence of reading glasses, this is a wrong idea).
After the improvement of age, the original reading glasses myopia degree is insufficient, but also immediately replaced. Therefore, reading glasses can not be worn, long-term wearing myopia is not suitable for reading glasses, not only for their daily life will produce a lot of trouble, will continue to speed up the process of presbyopia.
In general, presbyopia has two main manifestations:
The first is that close work or reading is difficult, for example, you must carry the book far away when reading, or you must read in an area with strong light sources to understand.
The second is eye strain. With the reduction of adjustment, reading requires slowly close to the limit of adjustment, that is, when reading, basically use all the adjustment of the eyes, which can not be used for a long time, and because of too much adjustment is very easy to produce eye fatigue symptoms such as eye swelling and headache.
The occurrence of the above two conditions indicates that the eyes are likely to gradually presbyopia. For the nearsighted group, the nearsighted glasses must be taken off or the reading book must be adjusted far away when reading near, which is also the main manifestation of presbyopia. After presbyopia, the safest way is to wear suitable reading glasses to carry out calibration.