Winter vacation is coming, many parents often use the holiday to change their children's discount prescription glasses.
As we all know, the function of myopia glasses is to correct vision. Nowadays, there are more and more options for myopia glasses on the market, whether it is lenses or frames. Many people are actually confused: how to choose glasses?
Glasses are designed to allow short-sighted people to draw out objects that are far away. And now there are many people in order to the most beautiful, in the choice of myopia glasses to pay attention to the appearance, do not care whether it has the effect of correcting vision. Let's take a look at how to choose myopia glasses.
How to choose myopia glasses?
First, the lens should be looked at four times, carefully choose the lens
A look at whether the glasses enterprise has obtained the production license of glasses products;
Second, see whether the optometry equipment and testing instruments of the optometry company have qualified marks;
Three to see whether the optometry, production personnel are licensed to work;
Four to see whether the glasses are qualified mark (certificate).
The quality of the lens is an important factor in determining the quality of a pair of glasses. At present, there are mainly optical glass, resin, MR Lens and PC lens on the market. Ordinary glass lenses are cheaper and scratch-resistant but heavier; Resin tablets and PC lenses are light and not easily broken, especially PC lenses, can get rid of rhinitis and headache caused by nose bridge compression, and it is safer for people who love sports. MR Lens is a high refractive index lens material with balanced performance indicators, thin lens, clear vision, high pressure resistance, lens is not easy to damage, and importantly, it is not easy to turn yellow, long-term clear and bright. From an aesthetic point of view, the height of the number of lenses should be selected with a high refractive index.
Second, lens material
Glass lens: stable refractive index, good wear resistance, stable optical performance, but relatively heavy, easy to break.
Resin lens (CR-39) : Light, safe, high light transmittance, not easy to break, but the surface is easy to wear.
PC lens: high refractive index, firm, but the surface is easy to wear.
Third, choose the frame to "light" first
Since the frame needs to sit on our nose for a long time, we have to prioritize its weight. A good pair of frames should be sturdy, light and comfortable. For people who are more sensitive to the bridge of the nose, choosing a relatively light plate or a light texture of strong tungsten carbon, pure titanium is more in line with health needs. If the degree is relatively high, you can choose a smaller frame to reduce the weight of the glasses. You can also appropriately choose glasses with nose brackets, which can reduce the weight on the bridge of the nose. When selecting the frame, pay attention to the center distance of the frame can not be too different from the pupil distance - small pupil distance should not choose a very wide shelf, otherwise it not only looks not beautiful, it is not comfortable to wear. Especially for high myopia, try to choose a small frame of the shelf, otherwise the assembled glasses lens edge will appear very thick.
Fourth, accurate optometry
It is best to choose a hospital or a relatively large optical shop for optometry.
People with glasses for the first time, especially children under the age of 13, it is best to dilate mydriasis and optometry. Whether adults want to dilate their eyes or not, also listen to the eye doctor.
The elderly should also wear glasses and optometry, do not buy glasses directly from the stall cheaply, so as not to cause damage to the eyes.
After optometry, the glasses should be worn for 15 to 30 minutes, and the short-sighted glasses and far-sighted glasses should be worn to walk and go up and down stairs; Reading glasses wearers should read books, read newspapers.
- Different groups of people
High myopia should buy lenses with a high refractive index n=1.70, 1.80 or even 1.90 (referring to glass lenses). At present, the highest refractive index of the resin lens is 1.74), in order to reduce the thickness of the lens, and it is not appropriate to buy color-changing lenses; Children should buy optical resin lenses to ensure the safety of wearing; Generally, patients with myopia should be equipped with slightly red optical red tablets or slightly blue-purple optical kox tablets to ensure that most of the UV damage to the human eye is blocked; Polarizing lenses are used by operators on the water. In order to increase the transmittance of light and improve the clarity of sight, you can choose a film lens.
