Haoqian Industry tells everyone how to tell whether acrylic lenses are good or bad?

Acrylic lenses tell everyone how to distinguish between good and bad lenses! Generally speaking, inferior glasses are produced by underground factories without a license, the equipment is simple, and the cost is very low, so the price is exceptional. In terms of lens materials, the resin matrix of inferior glasses is not pure, which can cause distortion or dizziness of the vision. The dispersion effect is large, which may cause visual fatigue. The impact resistance is poor and fragile. Low light transmittance and uneven light distribution. The refractive index does not meet the requirements of its promotion, exaggerating the ultra-thin degree of the lens.

In addition, it cannot protect against ultraviolet rays or only a few ultraviolet rays. Acrylic lens tells you that when the surface of the lens is disposed, the surface treatment of inferior products is not good, and there is no hardening and anti-flower function. Coating technology is poor, easy to strip. The film layer can not meet the requirements, the anti-reflection ability is low, and there are no special functions such as waterproof, anti-fouling and anti-fog. In terms of spectacle frame materials, inferior spectacle metal smelters are poor, with low purity, many impurities, and even radioactive elements harmful to the head. It has a large specific gravity and has a strong compression effect on the nose bridge, which is not conducive to the development of the nose bridge of adolescents and children. Poor elasticity, brittle and easy to crack. Poor appearance gloss and color, poor corrosion resistance, easy to rust, easy to change color. In addition, it also has a great effect on the skin, is easy to cause allergies, and is soft and deformable. Regarding the processing technology of spectacle frames, the inferior glasses have rough appearance and dull color. The electroplating technology department is good and easy to discolor.

  Poor welding technology, weak solder joints, easy to de-soldering. Hinge and thread are easily damaged. Inferior glasses can't meet national quality standards in assembly. The optical center of the double spectacle lens is high and low, left or right, inaccurate interpupillary distance, inaccurate astigmatic axis position, etc., will form an inappropriate prism effect, affecting normal visual function. Hold the acrylic lens and look at the distant scene through the lens about 30 cm away from the eye. If the scene is clear and undistorted, and there is no scene jump when the lens is moved slowly, it means that the lens has good transparency and optical uniformity