How to choose myopia childrens eyeglasses
1, the lens to see four, 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 glasses 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.
2, choose light to select the frame
Since the frame needs to sit on our nose for a long time, we have to prioritize its weight. A good pair of glasses should be strong, 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 choosing glasses, 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 ugly, but also uncomfortable to wear. In particular, high myopia should try to choose a small frame of the shelf, otherwise the assembled glasses lens edge appears very thick.
- Lens material
The glass lens has stable refractive index, good wear resistance and stable optical performance, but it is relatively heavy and easy to break.
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
4, accurate refraction
It is best to choose a hospital or a relatively large optical shop for optometry.
People who have glasses for the first time, if they are under the age of 35, should have mydriasis and optometry.
The elderly should also wear glasses and optometry, do not buy a mirror cheaply from the stall, so as not to cause damage to the eyes.
After optometry, consumers should try to wear 15 to 30 minutes, short-sighted glasses, far-sighted glasses should wear glasses to walk, up and down the stairs; Reading glasses wearers should read books, read newspapers.
- Different people
High myopia should buy lenses with a high refractive index n=1.70, 1.80 or even 1.90 (this refers 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 field is 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.
