Now on the market many new shape eyeglass mart, seemingly fashion is actually inferior. Poor quality glasses are very harmful to people, mainly in the following aspects:
① It affects the astigmatism axis, the development of nose bridge and the treatment effect of amblyopia in children, and affects the progress of myopia in adolescents. In addition, poor quality glasses resin matrix is not pure, can cause visual deformation or vertigo;
② Inferior glasses metal smelting process is poor, low purity, containing more impurities, and may even contain harmful radioactive elements to the head;
③ Inferior glasses in the assembly can not meet the national quality standards. The optical center of the binocular lens is high and low, left or right, pupil distance is not accurate, and the astigmatism axis is not accurate, which will cause inappropriate prism effect and affect the normal visual function.
In addition, it also has large irritation to the skin, easy to cause allergies, soft, easy to deform and other hazards.
How to choose the right pair of glasses?
01 The premise of choosing the right glasses – accurate optometry
Inaccurate optometry will deepen the near (far) degree of vision, and may also cause strabismus, which is very harmful to vision. Therefore, optometry should choose a qualified institution. If it is a teenager, a person with high myopia, anisometropia, etc., may need to dilate the pupil, it is best to go to the optometric center of the hospital, and avoid strenuous exercise or drinking alcoholic drinks before the optometry.
02 Choose quality lenses
The quality of the lens affects the pros and cons of the glasses, and the current market mainly has resin lenses, PC lenses and ordinary optical glass lenses. Among them, resin and PC lenses are relatively light in texture, and are not easy to break, especially PC lenses are more suitable for groups who love sports; The glass lens is cheaper and scratches resistant, but the control effect is not very good.
In addition, in the case of the same degree, the higher the refractive index of the lens, the thinner the lens, for those who are relatively high degree people try to choose a high refractive index lens, it is easier to wear.
03 Select a light frame
The selection of the frame affects the comfort of our daily wear, not to mention the frame also needs to be put on the nose for a long time, so the weight should also be used as a reference when selecting. Generally speaking, it is more appropriate to choose a frame of pure titanium or tungsten carbon material with relatively light texture, and it is more in line with health needs.
In addition, when choosing the frame, you can also consider the following points in combination with your own situation:
① The size of the frame should be based on the pupil distance of the wearer, that is, the geometric center distance of the selected frame should be consistent with the pupil distance of the wearer as far as possible.
The height of the frame should meet the requirements of the wearer's field of vision, such as when assembling glasses, in order to ensure that there is enough far-sight area and near-sight area, the frame can not be lower than a certain height.
(3) Children are in the growth and development period, the size of the face and head will continue to change, and the spectacle frame needs to be replaced regularly. Therefore, when choosing a frame for children, a frame with good elasticity, high strength, good safety and stable structure should be considered.
